Medical genetics

Short description: Medicine focused on hereditary disorders

"Clinical genetics" redirects here. For the journal, see Clinical Genetics (journal).

"Biochemical genetics" redirects here. For the scientific journal, see Biochemical Genetics (journal).

For a non-technical introduction to the topic, see Biology:Introduction to genetics.

Part of a series on

Genetics
Key components

* Chromosome
* DNA
* RNA

* Genome
* Heredity
* Mutation

* Nucleotide
* Variation

* Outline
* Index

History and topics

* Introduction
* History

* Evolution (molecular)
* Population genetics
* Mendelian inheritance
* Quantitative genetics
* Molecular genetics

Research

* DNA sequencing
* Genetic engineering
* Genomics ( template)
* Medical genetics

* Branches of genetics

Personalized medicine
Personalized medicine

* v
* t
* e

Medical genetics is the branch of medicine that involves the diagnosis and management of hereditary disorders. Medical genetics differs from human genetics in that human genetics is a field of scientific research that may or may not apply to medicine, while medical genetics refers to the application of genetics to medical care. For example, research on the causes and inheritance of genetic disorders would be considered within both human genetics and medical genetics, while the diagnosis, management, and counselling people with genetic disorders would be considered part of medical genetics.

In contrast, the study of typically non-medical phenotypes such as the genetics of eye color would be considered part of human genetics, but not necessarily relevant to medical genetics (except in situations such as albinism). Genetic medicine is a newer term for medical genetics and incorporates areas such as gene therapy, personalized medicine, and the rapidly emerging new medical specialty, predictive medicine.

Autosomal dominant and autosomal recessive inheritance, the two most common Mendelian inheritance patterns. An autosome is any chromosome other than a sex chromosome.

## Contents

* 1 Scope
* 2 Subspecialties
* 2.1 Clinical genetics
* 2.1.1 Training and qualification
* 2.2 Metabolic/biochemical genetics
* 2.3 Cytogenetics
* 2.4 Molecular genetics
* 2.5 Mitochondrial genetics
* 3 Genetic counseling
* 4 History
* 5 Current practice
* 5.1 Diagnostic evaluation
* 5.1.1 Chromosome studies
* 5.1.2 Basic metabolic studies
* 5.1.3 Molecular studies
* 5.2 Treatments
* 5.2.1 Management of metabolic disorders
* 5.2.2 Other examples
* 6 Career paths and training
* 7 Ethical, legal and social implications
* 8 Societies
* 9 Research
* 9.1 Basic genetics research
* 9.1.1 Allelic architecture of disease
* 9.1.2 Population substructure in genetics research
* 10 See also
* 11 References
* 12 Further reading
* 13 External links

## Scope

Medical genetics encompasses many different areas, including clinical practice of physicians, genetic counselors, and nutritionists, clinical diagnostic laboratory activities, and research into the causes and inheritance of genetic disorders. Examples of conditions that fall within the scope of medical genetics include birth defects and dysmorphology, intellectual disabilities, autism, mitochondrial disorders, skeletal dysplasia, connective tissue disorders, cancer genetics, and prenatal diagnosis. Medical genetics is increasingly becoming relevant to many common diseases. Overlaps with other medical specialties are beginning to emerge, as recent advances in genetics are revealing etiologies for morphologic, endocrine, cardiovascular, pulmonary, ophthalmologist, renal, psychiatric, and dermatologic conditions. The medical genetics community is increasingly involved with individuals who have undertaken elective genetic and genomic testing.[citation needed]

## Subspecialties

In some ways, many of the individual fields within medical genetics are hybrids between clinical care and research. This is due in part to recent advances in science and technology (for example, see the Human Genome Project) that have enabled an unprecedented understanding of genetic disorders.[citation needed]

### Clinical genetics

Clinical genetics a medical specialty with particular attention to hereditary disorders. Branches of clinical genetics include:[citation needed]

1\. Prenatal genetics

* Couples at risk of having a child with a genetic disorder preconception or while pregnant
* High risk prenatal screening results
* Abnormal fetal ultrasound

2\. Pediatric genetics

* Birth defects
* developmental delay, autism, epilepsy
* short stature and skeletal dysplasia

3\. Adult genetics

* cardiomyopathy and cardiac dysrhythmias
* inherited kidney disease
* dementia and neurodegeneration
* connective tissue disease

4\. Cancer genetics

* breast/ovarian cancer
* bowel cancer
* endocrine tumors

Examples of genetic syndromes that are commonly seen in the genetics clinic include chromosomal rearrangements (e.g. Down syndrome, 22q11.2 deletion syndrome, Turner syndrome, Williams syndrome), Fragile X syndrome, Marfan syndrome, neurofibromatosis, Huntington disease, familial adenomatous polyposis, and many more.[citation needed]

#### Training and qualification

In Europe, the training of physicians in Clinical/Medical Genetics is overseen by the Union Européenne des Médecins Spécialistes (UEMS). This organization aims to harmonize and raise the standards of medical specialist training across Europe. The UEMS has established European Training Requirements (ETR) for Medical Genetics to guide the education and training of medical geneticists.[citation needed]

Individuals seeking acceptance into clinical genetics training programs must hold an MD, or in some countries, an MB ChB or MB BS degree. These qualifications ensure that trainees have the foundational medical knowledge required to specialize in Medical Genetics. The optimal training program involves a total of five years: one year of general medical training (the "common trunk", often covering fields such as general practice, pediatrics, obstetrics and gynecology, neurology, psychiatry, and internal medicine) followed by four years of specialized training in Medical Genetics. This specialized training should include at least two years of clinical patient care and at least six months in genetic laboratory diagnostics. Trainees' progress is evaluated through a structured program that begins with observation and progresses to independent practice under supervision, culminating in the ability to manage complex cases independently.[citation needed]

Final certification involves a comprehensive assessment, which may include national examinations or the European Certificate in Medical Genetics and Genomics (ECMGG). This certificate serves as a benchmark for high standards in the specialty across Europe and is increasingly recognized by various national regulatory authorities.[citation needed]

In the United States, physicians who practice clinical genetics are accredited by the American Board of Medical Genetics and Genomics (ABMGG).[1] In order to become a board-certified practitioner of Clinical Genetics, a physician must complete a minimum of 24 months of training in a program accredited by the ABMGG. Individuals seeking acceptance into clinical genetics training programs must hold an M.D. or D.O. degree (or their equivalent) and have completed a minimum of 12 months of training in an ACGME-accredited residency program in internal medicine, pediatrics, obstetrics and gynecology, or other medical specialty.[2]

In Australia and New Zealand, clinical genetics is a three-year advanced training program for those who already have their primary medical qualification (MBBS or MD) and have successfully completed basic training in either paediatric medicine or adult medicine. Training is overseen by the Royal Australasian College of Physicians with the Australasian Association of Clinical Geneticists contributing to authorship of the curriculum via their parent organization, the Human Genetics Society of Australasia.[3]

### Metabolic/biochemical genetics

Metabolic (or biochemical) genetics involves the diagnosis and management of inborn errors of metabolism in which patients have enzymatic deficiencies that perturb biochemical pathways involved in metabolism of carbohydrates, amino acids, and lipids. Examples of metabolic disorders include galactosemia, glycogen storage disease, lysosomal storage disorders, metabolic acidosis, peroxisomal disorders, phenylketonuria, and urea cycle disorders.[citation needed]

### Cytogenetics

Cytogenetics is the study of chromosomes and chromosome abnormalities. While cytogenetics historically relied on microscopy to analyze chromosomes, new molecular technologies such as array comparative genomic hybridization are now becoming widely used. Examples of chromosome abnormalities include aneuploidy, chromosomal rearrangements, and genomic deletion/duplication disorders.[citation needed]

### Molecular genetics

Molecular genetics involves the discovery of and laboratory testing for DNA mutations that underlie many single gene disorders. Examples of single gene disorders include achondroplasia, cystic fibrosis, Duchenne muscular dystrophy, hereditary breast cancer (BRCA1/2), Huntington disease, Marfan syndrome, Noonan syndrome, and Rett syndrome. Molecular tests are also used in the diagnosis of syndromes involving epigenetic abnormalities, such as Angelman syndrome, Beckwith-Wiedemann syndrome, Prader-willi syndrome, and uniparental disomy.[citation needed]

### Mitochondrial genetics

Mitochondrial genetics concerns the diagnosis and management of mitochondrial disorders, which have a molecular basis but often result in biochemical abnormalities due to deficient energy production.[citation needed]

There exists some overlap between medical genetic diagnostic laboratories and molecular pathology.[citation needed]

## Genetic counseling

Genetic counseling is the process of providing information about genetic conditions, diagnostic testing, and risks in other family members, within the framework of nondirective counseling. Genetic counselors are non-physician members of the medical genetics team who specialize in family risk assessment and counseling of patients regarding genetic disorders. The precise role of the genetic counselor varies somewhat depending on the disorder. When working alongside geneticists, genetic counselors normally specialize in pediatric genetics which focuses on developmental abnormalities present in newborns, infants or children. The major goal of pediatric counseling is attempting to explain the genetic basis behind the child's developmental concerns in a compassionate and articulated manner that allows the potentially distressed or frustrated parents to easily understand the information. As well, genetic counselors normally take a family pedigree, which summarizes the medical history of the patient's family. This then aids the clinical geneticist in the differential diagnosis process and help determine which further steps should be taken to help the patient.[4]

## History

Although genetics has its roots back in the 19th century with the work of the Bohemian monk Gregor Mendel and other pioneering scientists, human genetics emerged later. It started to develop, albeit slowly, during the first half of the 20th century. Mendelian (single-gene) inheritance was studied in a number of important disorders such as albinism, brachydactyly (short fingers and toes), and hemophilia. Mathematical approaches were also devised and applied to human genetics. Population genetics was created.[citation needed]

Medical genetics was a late developer, emerging largely after the close of World War II (1945) when the eugenics movement had fallen into disrepute.[5] The Nazi misuse of eugenics sounded its death knell.[6] Shorn of eugenics, a scientific approach could be used and was applied to human and medical genetics. Medical genetics saw an increasingly rapid rise in the second half of the 20th century and continues in the 21st century.[citation needed]

## Current practice

The clinical setting in which patients are evaluated determines the scope of practice, diagnostic, and therapeutic interventions. For the purposes of general discussion, the typical encounters between patients and genetic practitioners may involve:[citation needed]

* Referral to an out-patient genetics clinic (pediatric, adult, or combined) or an in-hospital consultation, most often for diagnostic evaluation.
* Specialty genetics clinics focusing on management of inborn errors of metabolism, skeletal dysplasia, or lysosomal storage diseases.
* Referral for counseling in a prenatal genetics clinic to discuss risks to the pregnancy (advanced maternal age, teratogen exposure, family history of a genetic disease), test results (abnormal maternal serum screen, abnormal ultrasound), and/or options for prenatal diagnosis (typically non-invasive prenatal screening, diagnostic amniocentesis or chorionic villus sampling).
* Multidisciplinary specialty clinics that include a clinical geneticist or genetic counselor (cancer genetics, cardiovascular genetics, craniofacial or cleft lip/palate, hearing loss clinics, muscular dystrophy/neurodegenerative disorder clinics).

### Diagnostic evaluation

Each patient will undergo a diagnostic evaluation tailored to their own particular presenting signs and symptoms. The geneticist will establish a differential diagnosis and recommend appropriate testing. These tests might evaluate for chromosomal disorders, inborn errors of metabolism, or single gene disorders.[citation needed]

#### Chromosome studies

Schematic karyogram of a human, with annotated bands and sub-bands as used in the International System for Human Cytogenomic Nomenclature for chromosomal abnormalities. It shows dark and white regions on G banding. It shows 22 homologous chromosomes, both the male (XY) and female (XX) versions of the sex chromosome (bottom right), as well as the mitochondrial genome (at bottom left).

Chromosome studies are used in the general genetics clinic to determine a cause for developmental delay or intellectual disability, birth defects, dysmorphic features, or autism. Chromosome analysis is also performed in the prenatal setting to determine whether a fetus is affected with aneuploidy or other chromosome rearrangements. Finally, chromosome abnormalities are often detected in cancer samples. A large number of different methods have been developed for chromosome analysis:

* Chromosome analysis using a karyotype involves special stains that generate light and dark bands, allowing identification of each chromosome under a microscope.
* Fluorescence in situ hybridization (FISH) involves fluorescent labeling of probes that bind to specific DNA sequences, used for identifying aneuploidy, genomic deletions or duplications, characterizing chromosomal translocations and determining the origin of ring chromosomes.
* Chromosome painting is a technique that uses fluorescent probes specific for each chromosome to differentially label each chromosome. This technique is more often used in cancer cytogenetics, where complex chromosome rearrangements can occur.
* Array comparative genomic hybridization is a newer molecular technique that involves hybridization of an individual DNA sample to a glass slide or microarray chip containing molecular probes (ranging from large ~200kb bacterial artificial chromosomes to small oligonucleotides) that represent unique regions of the genome. This method is particularly sensitive for detection of genomic gains or losses across the genome but does not detect balanced translocations or distinguish the location of duplicated genetic material (for example, a tandem duplication versus an insertional duplication).

#### Basic metabolic studies

Biochemical studies are performed to screen for imbalances of metabolites in the bodily fluid, usually the blood (plasma/serum) or urine, but also in cerebrospinal fluid (CSF). Specific tests of enzyme function (either in leukocytes, skin fibroblasts, liver, or muscle) are also employed under certain circumstances. In the US, the newborn screen incorporates biochemical tests to screen for treatable conditions such as galactosemia and phenylketonuria (PKU). Patients suspected to have a metabolic condition might undergo the following tests:[citation needed]

* Quantitative amino acid analysis is typically performed using the ninhydrin reaction, followed by liquid chromatography to measure the amount of amino acid in the sample (either urine, plasma/serum, or CSF). Measurement of amino acids in plasma or serum is used in the evaluation of disorders of amino acid metabolism such as urea cycle disorders, maple syrup urine disease, and PKU. Measurement of amino acids in urine can be useful in the diagnosis of cystinuria or renal Fanconi syndrome as can be seen in cystinosis.
* Urine organic acid analysis can be either performed using quantitative or qualitative methods, but in either case the test is used to detect the excretion of abnormal organic acids. These compounds are normally produced during bodily metabolism of amino acids and odd-chain fatty acids, but accumulate in patients with certain metabolic conditions.
* The acylcarnitine combination profile detects compounds such as organic acids and fatty acids conjugated to carnitine. The test is used for detection of disorders involving fatty acid metabolism, including MCAD.
* Pyruvate and lactate are byproducts of normal metabolism, particularly during anaerobic metabolism. These compounds normally accumulate during exercise or ischemia, but are also elevated in patients with disorders of pyruvate metabolism or mitochondrial disorders.
* Ammonia is an end product of amino acid metabolism and is converted in the liver to urea through a series of enzymatic reactions termed the urea cycle. Elevated ammonia can therefore be detected in patients with urea cycle disorders, as well as other conditions involving liver failure.
* Enzyme testing is performed for a wide range of metabolic disorders to confirm a diagnosis suspected based on screening tests.

#### Molecular studies

* DNA sequencing is used to directly analyze the genomic DNA sequence of a particular gene. In general, only the parts of the gene that code for the expressed protein (exons) and small amounts of the flanking untranslated regions and introns are analyzed. Therefore, although these tests are highly specific and sensitive, they do not routinely identify all of the mutations that could cause disease.[citation needed]
* DNA methylation analysis is used to diagnose certain genetic disorders that are caused by disruptions of epigenetic mechanisms such as genomic imprinting and uniparental disomy.[citation needed]
* Southern blotting is an early technique basic on detection of fragments of DNA separated by size through gel electrophoresis and detected using radiolabeled probes. This test was routinely used to detect deletions or duplications in conditions such as Duchenne muscular dystrophy but is being replaced by high-resolution array comparative genomic hybridization techniques. Southern blotting is still useful in the diagnosis of disorders caused by trinucleotide repeats.[citation needed]

### Treatments

Each cell of the body contains the hereditary information (DNA) wrapped up in structures called chromosomes. Since genetic syndromes are typically the result of alterations of the chromosomes or genes, there is no treatment currently available that can correct the genetic alterations in every cell of the body. Therefore, there is currently no "cure" for genetic disorders. However, for many genetic syndromes there is treatment available to manage the symptoms. In some cases, particularly inborn errors of metabolism, the mechanism of disease is well understood and offers the potential for dietary and medical management to prevent or reduce the long-term complications. In other cases, infusion therapy is used to replace the missing enzyme. Current research is actively seeking to use gene therapy or other new medications to treat specific genetic disorders.[citation needed]

#### Management of metabolic disorders

In general, metabolic disorders arise from enzyme deficiencies that disrupt normal metabolic pathways. For instance, in the hypothetical example:

A ⟶ B ⟶ C ⟶ D AAAA ⟶ BBBBBB ⟶ CCCCCCCCCC ⟶ (no D)
X Y Z X Y | (no or insufficient Z)
EEEEE

Compound "A" is metabolized to "B" by enzyme "X", compound "B" is metabolized to "C" by enzyme "Y", and compound "C" is metabolized to "D" by enzyme "Z". If enzyme "Z" is missing, compound "D" will be missing, while compounds "A", "B", and "C" will build up. The pathogenesis of this particular condition could result from lack of compound "D", if it is critical for some cellular function, or from toxicity due to excess "A", "B", and/or "C", or from toxicity due to the excess of "E" which is normally only present in small amounts and only accumulates when "C" is in excess. Treatment of the metabolic disorder could be achieved through dietary supplementation of compound "D" and dietary restriction of compounds "A", "B", and/or "C" or by treatment with a medication that promoted disposal of excess "A", "B", "C" or "E". Another approach that can be taken is enzyme replacement therapy, in which a patient is given an infusion of the missing enzyme "Z" or cofactor therapy to increase the efficacy of any residual "Z" activity.[citation needed]

* Diet

Dietary restriction and supplementation are key measures taken in several well-known metabolic disorders, including galactosemia, phenylketonuria (PKU), maple syrup urine disease, organic acidurias and urea cycle disorders. Such restrictive diets can be difficult for the patient and family to maintain, and require close consultation with a nutritionist who has special experience in metabolic disorders. The composition of the diet will change depending on the caloric needs of the growing child and special attention is needed during a pregnancy if a woman is affected with one of these disorders.[citation needed]

* Medication

Medical approaches include enhancement of residual enzyme activity (in cases where the enzyme is made but is not functioning properly), inhibition of other enzymes in the biochemical pathway to prevent buildup of a toxic compound, or diversion of a toxic compound to another form that can be excreted. Examples include the use of high doses of pyridoxine (vitamin B6) in some patients with homocystinuria to boost the activity of the residual cystathione synthase enzyme, administration of biotin to restore activity of several enzymes affected by deficiency of biotinidase, treatment with NTBC in Tyrosinemia to inhibit the production of succinylacetone which causes liver toxicity, and the use of sodium benzoate to decrease ammonia build-up in urea cycle disorders.[citation needed]

* Enzyme replacement therapy

Certain lysosomal storage diseases are treated with infusions of a recombinant enzyme (produced in a laboratory), which can reduce the accumulation of the compounds in various tissues. Examples include Gaucher disease, Fabry disease, Mucopolysaccharidoses and Glycogen storage disease type II. Such treatments are limited by the ability of the enzyme to reach the affected areas (the blood brain barrier prevents enzyme from reaching the brain, for example), and can sometimes be associated with allergic reactions. The long-term clinical effectiveness of enzyme replacement therapies vary widely among different disorders.

#### Other examples

* Angiotensin receptor blockers in Marfan syndrome & Loeys-Dietz
* Bone marrow transplantation
* Gene therapy

## Career paths and training

The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject. You may improve this section, discuss the issue on the talk page, or create a new article, as appropriate. (August 2015) (Learn how and when to remove this template message)

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Geneticist working with a pedigree

There are a variety of career paths within the field of medical genetics, and naturally the training required for each area differs considerably. The information included in this section applies to the typical pathways in the United States and there may be differences in other countries. US practitioners in clinical, counseling, or diagnostic subspecialties generally obtain board certification through the American Board of Medical Genetics.

Career | Degree | Description | Training

|
|
|

Genetic counselor | MS | A genetic counselor specializes in the communication of genetic information to patients and families. Genetic counselors often work closely with Clinical geneticists or other physicians (such as Obstetricians or Oncologists) and often convey the results of the recommended tests. | College (4 yrs) → Graduate program in Genetic counseling (2 yrs).
Metabolic nurse and/or nutritionist | BA/BS, MS, RN | One of the critical aspects of the management of patients with metabolic disorders is the appropriate nutritional intervention (either restricting the compound that cannot be metabolized or supplementing deficient compounds as the result of an enzyme deficiency). The metabolic nurse and nutritionist play important roles in coordinating dietary management. | College (4 yrs) → Nursing school or graduate training in nutrition.
Biochemical diagnostics | BS, MS, PhD, MBBS, MD, DO, DO-PhD, or MD-PhD | Individuals who specialize in Biochemical genetics typically work in the diagnostic laboratory, analyzing and interpreting specialized biochemical tests that measure amino acids, organic acids, and enzyme activity. Some Clinical Geneticists are also board-certified in Biochemical Genetics. | College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (4 years)
Cytogenetic diagnostics | BS, MS, PhD, MBBS, MD, DO, DO-PhD, or MD-PhD | Individuals who specialize in Cytogenetics typically work in the diagnostic laboratory, analyzing and interpreting karyotypes, FISH, and comparative genomic hybridization tests. Some Clinical Geneticists are also board-certified in Cytogenetics. | College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (4 years)
Molecular genetics | BS, MS, PhD, MBBS, MD, DO, DO-PhD, or MD-PhD | Individuals who specialize in Molecular genetics typically work in the diagnostic laboratory, analyzing and interpreting specialized genetic tests that look for disease-causing changes (mutations) in the DNA. Some examples of molecular diagnostic tests include DNA sequencing and Southern blotting. | College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (4 years)
Research geneticist | BS, MS, PhD, MBBS, MD, DO, DO-PhD, or MD-PhD | Any researcher who studies the genetic basis of human disease or uses model organisms to study disease mechanisms could be considered a Research Geneticist. Many of the clinical career paths also include basic or translational research, and thus individuals in the field of medical genetics often participate in some form of research. | College (4 yrs) → Graduate school (PhD, usually 4–7 years) and/or Medical school (4 years) → Post-doctoral research training (usually 3+ years)
Laboratory technician | AS, BS, MS | Technicians in the diagnostic or research labs handle samples and run the assays at the bench. | College (4 yrs), may have higher degree (MS, 2+ years)

## Ethical, legal and social implications

Genetic information provides a unique type of knowledge about an individual and his/her family, fundamentally different from a typically laboratory test that provides a "snapshot" of an individual's health status. The unique status of genetic information and inherited disease has a number of ramifications with regard to ethical, legal, and societal concerns.

On 19 March 2015, scientists urged a worldwide ban on clinical use of methods, particularly the use of CRISPR and zinc finger, to edit the human genome in a way that can be inherited.[7][8][9][10] In April 2015 and April 2016, Chinese researchers reported results of basic research to edit the DNA of non-viable human embryos using CRISPR.[11][12][13] In February 2016, British scientists were given permission by regulators to genetically modify human embryos by using CRISPR and related techniques on condition that the embryos were destroyed within seven days.[14] In June 2016 the Dutch government was reported to be planning to follow suit with similar regulations which would specify a 14-day limit.[15]

## Societies

The more empirical approach to human and medical genetics was formalized by the founding in 1948 of the American Society of Human Genetics. The Society first began annual meetings that year (1948) and its international counterpart, the International Congress of Human Genetics, has met every 5 years since its inception in 1956. The Society publishes the American Journal of Human Genetics on a monthly basis.[citation needed]

Medical genetics is recognized as a distinct medical specialty. In the U.S., medical genetics has its own approved board (the American Board of Medical Genetics) and clinical specialty college (the American College of Medical Genetics). The college holds an annual scientific meeting, publishes a monthly journal, Genetics in Medicine, and issues position papers and clinical practice guidelines on a variety of topics relevant to human genetics.[citation needed]

In Australia and New Zealand, medical geneticists are trained and certified under the auspices of the Royal Australasian College of Physicians, but professionally belong to the Human Genetics Society of Australasia and its special interest group, the Australasian Association of Clinical Geneticists, for ongoing education, networking and advocacy.[citation needed]

## Research

The broad range of research in medical genetics reflects the overall scope of this field, including basic research on genetic inheritance and the human genome, mechanisms of genetic and metabolic disorders, translational research on new treatment modalities, and the impact of genetic testing

### Basic genetics research

Basic research geneticists usually undertake research in universities, biotechnology firms and research institutes.

#### Allelic architecture of disease

Sometimes the link between a disease and an unusual gene variant is more subtle. The genetic architecture of common diseases is an important factor in determining the extent to which patterns of genetic variation influence group differences in health outcomes.[16][17][18] According to the common disease/common variant hypothesis, common variants present in the ancestral population before the dispersal of modern humans from Africa play an important role in human diseases.[19] Genetic variants associated with Alzheimer disease, deep venous thrombosis, Crohn disease, and type 2 diabetes appear to adhere to this model.[20] However, the generality of the model has not yet been established and, in some cases, is in doubt.[17][21][22] Some diseases, such as many common cancers, appear not to be well described by the common disease/common variant model.[23]

Another possibility is that common diseases arise in part through the action of combinations of variants that are individually rare.[24][25] Most of the disease-associated alleles discovered to date have been rare, and rare variants are more likely than common variants to be differentially distributed among groups distinguished by ancestry.[23][26] However, groups could harbor different, though perhaps overlapping, sets of rare variants, which would reduce contrasts between groups in the incidence of the disease.

The number of variants contributing to a disease and the interactions among those variants also could influence the distribution of diseases among groups. The difficulty that has been encountered in finding contributory alleles for complex diseases and in replicating positive associations suggests that many complex diseases involve numerous variants rather than a moderate number of alleles, and the influence of any given variant may depend in critical ways on the genetic and environmental background.[21][27][28][29] If many alleles are required to increase susceptibility to a disease, the odds are low that the necessary combination of alleles would become concentrated in a particular group purely through drift.[30]

#### Population substructure in genetics research

One area in which population categories can be important considerations in genetics research is in controlling for confounding between population substructure, environmental exposures, and health outcomes. Association studies can produce spurious results if cases and controls have differing allele frequencies for genes that are not related to the disease being studied,[31] although the magnitude of this problem in genetic association studies is subject to debate.[32][33] Various methods have been developed to detect and account for population substructure,[34][35] but these methods can be difficult to apply in practice.[36]

Population substructure also can be used to advantage in genetic association studies.[37] For example, populations that represent recent mixtures of geographically separated ancestral groups can exhibit longer-range linkage disequilibrium between susceptibility alleles and genetic markers than is the case for other populations.[38][39][40][41] Genetic studies can use this admixture linkage disequilibrium to search for disease alleles with fewer markers than would be needed otherwise. Association studies also can take advantage of the contrasting experiences of racial or ethnic groups, including migrant groups, to search for interactions between particular alleles and environmental factors that might influence health.[42][43]

## See also

* Full genome sequencing
* Inborn error of metabolism
* Predictive medicine
* DNA Valley

## References

1. ↑ "American Board of Medical Genetics and Genomics". http://abmgg.org/.
2. ↑ "Training Options - ABMGG". http://abmgg.org/pages/training_options.shtml.
3. ↑ RACP. "Clinical Genetics". Royal Australasian College of Physicians. https://www.racp.edu.au/trainees/advanced-training/advanced-training-programs/clinical-genetics.
4. ↑ Resta, Robert (19 May 2006). "A new definition of genetic counseling: national society of genetic counselors' task force report". Journal of Genetic Counseling 15 (2): 77–83. doi:10.1007/s10897-005-9014-3. PMID 16761103.
5. ↑ Rose, Nikolas. (2009). The Politics of Life Itself : Biomedicine, Power, and Subjectivity in the Twenty-First Century.. Princeton University Press. ISBN 978-0-691-12190-1. OCLC 995257497.
6. ↑ KOCH, TOM (2011-03-25). "Eugenics and the Genetic Challenge, Again: All Dressed Up and Just Everywhere to Go". Cambridge Quarterly of Healthcare Ethics 20 (2): 191–203. doi:10.1017/s0963180110000848. ISSN 0963-1801. PMID 21435294.
7. ↑ Wade, Nicholas (19 March 2015). "Scientists Seek Ban on Method of Editing the Human Genome". New York Times. https://www.nytimes.com/2015/03/20/science/biologists-call-for-halt-to-gene-editing-technique-in-humans.html.
8. ↑ Pollack, Andrew (3 March 2015). "A Powerful New Way to Edit DNA". New York Times. https://www.nytimes.com/2014/03/04/health/a-powerful-new-way-to-edit-dna.html.
9. ↑ Baltimore, David; Berg, Paul; Botchan, Dana; Charo, R. Alta; Church, George; Corn, Jacob E.; Daley, George Q.; Doudna, Jennifer A. et al. (19 March 2015). "A prudent path forward for genomic engineering and germline gene modification". Science 348 (6230): 36–8. doi:10.1126/science.aab1028. PMID 25791083. Bibcode: 2015Sci...348...36B.
10. ↑ Lanphier, Edward; Urnov, Fyodor; Haecker, Sarah Ehlen; Werner, Michael; Smolenski, Joanna (26 March 2015). "Don't edit the human germ line". Nature 519 (7544): 410–411. doi:10.1038/519410a. PMID 25810189. Bibcode: 2015Natur.519..410L.
11. ↑ Kolata, Gina (23 April 2015). "Chinese Scientists Edit Genes of Human Embryos, Raising Concerns". New York Times. https://www.nytimes.com/2015/04/24/health/chinese-scientists-edit-genes-of-human-embryos-raising-concerns.html.
12. ↑ Liang, Puping; Xu, Yanwen; Zhang, Xiya; Ding, Chenhui; Huang, Rui; Zhang, Zhen; Lv, Jie; Xie, Xiaowei et al. (18 April 2015). "CRISPR/Cas9-mediated gene editing in human tripronuclear zygotes". Protein & Cell 6 (5): 363–72. doi:10.1007/s13238-015-0153-5. PMID 25894090.
13. ↑ Regalado, Antonio (2016-05-08). "Chinese Researchers Experiment with Making HIV-Proof Embryos". https://www.technologyreview.com/s/601235/chinese-researchers-experiment-with-making-hiv-proof-embryos/.
14. ↑ Gallagher, James (1 February 2016). "Scientists get 'gene editing' go-ahead". BBC News (BBC). https://www.bbc.co.uk/news/health-35459054.
15. ↑ Amjad, Anneesa (2016-06-06). "Dutch government seeks to allow creation of human embryos for research". http://www.bionews.org.uk/page_656023.asp.
16. ↑ "On the allelic spectrum of human disease". Trends Genet 17 (9): 502–510. 2001. doi:10.1016/s0168-9525(01)02410-6. PMID 11525833.
17. ↑ 17.0 17.1 Pritchard JK (2002). "The allelic architecture of human disease genes: common disease-common variant...or not?". Hum Mol Genet 11 (20): 2417–2423. doi:10.1093/hmg/11.20.2417. PMID 12351577.
18. ↑ "The allelic structure of common disease". Hum Mol Genet 11 (20): 2455–2461. 2002. doi:10.1093/hmg/11.20.2455. PMID 12351581.
19. ↑ "Human migrations and population structure: what we know and why it matters". Annu Rev Genom Hum Genet 3: 129–152. 2002. doi:10.1146/annurev.genom.3.022502.103200. PMID 12142358.
20. ↑ "Meta-analysis of genetic association studies supports a contribution of common variants to susceptibility to common disease". Nat Genet 33 (2): 177–182. 2003. doi:10.1038/ng1071. PMID 12524541.
21. ↑ 21.0 21.1 "How many diseases does it take to map a gene with SNPs?". Nat Genet 26 (2): 151–157. 2000. doi:10.1038/79866. PMID 11017069.
22. ↑ "Using haplotype blocks to map human complex trait loci". Trends Genet 19 (3): 135–140. 2003. doi:10.1016/s0168-9525(03)00022-2. PMID 12615007.
23. ↑ 23.0 23.1 "Race, ancestry, and genes: implications for defining disease risk". Annu Rev Genom Hum Genet 4: 33–67. 2003. doi:10.1146/annurev.genom.4.070802.110356. PMID 14527296.
24. ↑ Pritchard JK (2001). "Are rare variants responsible for susceptibility to complex diseases?". Am J Hum Genet 69 (1): 124–137. doi:10.1086/321272. PMID 11404818.
25. ↑ "Multiple rare alleles contribute to low plasma levels of HDL cholesterol". Science 305 (5685): 869–872. 2004. doi:10.1126/science.1099870. PMID 15297675. Bibcode: 2004Sci...305..869C.
26. ↑ Risch N, Burchard E, Ziv E, Tang H, "Categorization of humans in biomedical research: genes, race and disease", Genome Biol (2002) 3 (http://genomebiology.com/2002/3/7/comment/2007 ) (electronically published July 1, 2002; accessed August 25, 2005)
27. ↑ Risch N (2000). "Searching for the genetic determinants in a new millennium". Nature 405 (6788): 847–856. doi:10.1038/35015718. PMID 10866211.
28. ↑ "Genomewide scans of complex human diseases: true linkage is hard to find". Am J Hum Genet 69 (5): 936–950. 2001. doi:10.1086/324069. PMID 11565063.
29. ↑ "A comprehensive review of genetic association studies". Genet Med 4 (2): 45–61. 2002. doi:10.1097/00125817-200203000-00002. PMID 11882781.
30. ↑ Cooper RS, "Genetic factors in ethnic disparities in health", in Anderson NB, Bulatao RA, Cohen B, eds., Critical perspectives on racial and ethnic differences in health in later life, (Washington DC: National Academy Press, 2004), 267–309.
31. ↑ "Population stratification and spurious allelic association". Lancet 361 (9357): 598–604. 2003. doi:10.1016/s0140-6736(03)12520-2. PMID 12598158. ; "The effects of human population structure on large genetic association studies". Nat Genet 36 (5): 512–517. 2004. doi:10.1038/ng1337. PMID 15052271.
32. ↑ "Point: population stratification: a problem for case-control studies of candidate-gene associations?". Cancer Epidemiol Biomarkers Prev 11 (6): 505–512. 2002. PMID 12050090.
33. ↑ "Counterpoint: bias from population stratification is not a major threat to the validity of conclusions from epidemiological studies of common polymorphisms and cancer". Cancer Epidemiol Biomarkers Prev 11 (6): 513–520. 2002. PMID 12050091.
34. ↑ "Tests and estimates of allelic association in complex inheritance". Proc Natl Acad Sci USA 95 (19): 11389–11393. 1998. doi:10.1073/pnas.95.19.11389. PMID 9736746. Bibcode: 1998PNAS...9511389M.
35. ↑ "Control of confounding of genetic associations in stratified populations". Am J Hum Genet 72 (6): 1492–1504. 2003. doi:10.1086/375613. PMID 12817591.
36. ↑ "Assessing the impact of population stratification on genetic association studies". Nat Genet 36 (4): 388–393. 2004. doi:10.1038/ng1333. PMID 15052270.
37. ↑ "Accounting for ancestry: population substructure and genome-wide association studies". Human Molecular Genetics 17 (R2): R143–R150. October 2008. doi:10.1093/hmg/ddn268. PMID 18852203.
38. ↑ "Design and analysis of admixture mapping studies". Am J Hum Genet 74 (5): 965–978. 2004. doi:10.1086/420855. PMID 15088268.
39. ↑ "Methods for high-density admixture mapping of disease genes". Am J Hum Genet 74 (5): 979–1000. 2004. doi:10.1086/420871. PMID 15088269.
40. ↑ "A high-density admixture map for disease gene discovery in African Americans". Am J Hum Genet 74 (5): 1001–1013. 2004. doi:10.1086/420856. PMID 15088270.
41. ↑ McKeigue PM (2005). "Prospects for admixture mapping of complex traits". Am J Hum Genet 76 (1): 1–7. doi:10.1086/426949. PMID 15540159.
42. ↑ Chaturvedi N (2001). "Ethnicity as an epidemiological determinant—crudely racist or crucially important?". Int J Epidemiol 30 (5): 925–927. doi:10.1093/ije/30.5.925. PMID 11689494.
43. ↑ "A vision for the future of genomics research". Nature 422 (6934): 835–847. 2003. doi:10.1038/nature01626. PMID 12695777. Bibcode: 2003Natur.422..835C.

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