Synapsis

Synapsis or syzygy is the pairing of two chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis. When homologous chromosomes synapse, their ends are first attached to the nuclear envelope. These end-membrane complexes then migrate, assisted by the extranuclear cytoskeleton, until matching ends have been paired. Then the intervening regions of the chromosome are brought together, and may be connected by a protein-DNA complex called the synaptonemal complex (SC).[1] The SC protein scaffold stabilizes the physical pairing of homologous chromosomes by polymerizing between them during meiotic prophase.[2] During synapsis, autosomes are held together by the synaptonemal complex along their whole length, whereas for sex chromosomes, this only takes place at one end of each chromosome.[3]

This is not to be confused with mitosis. Mitosis also has prophase, but does not ordinarily do pairing of two homologous chromosomes.[4] In contrast to the mitosis cycle, during meiosis, the number of chromosomes is reduced by half to create haploid gametes; this reduction is called Haploidization; after fertilization, diploidy is restored. Homologous chromosomes – two copies inherited from each parent – recognize one another and pair before reductional segregation, which is essential for crossover recombination and forms chiasmata,[5] a stable physical connection that hold homologous chromosomes together until metaphase.[2] In most species, every homologous chromosome experiences at least one meiotic crossover referred to as the obligate crossover.[5]

When the non-sister chromatids intertwine, segments of chromatids with similar sequence may break apart and be exchanged in a process known as genetic recombination or "crossing-over". This exchange produces a chiasma, a region that is shaped like an X, where the two chromosomes are physically joined. At least one chiasma per chromosome often appears to be necessary to stabilise bivalents along the metaphase plate during separation. The crossover of genetic material also provides a possible defences against 'chromosome killer' mechanisms, by removing the distinction between 'self' and 'non-self' through which such a mechanism could operate. A further consequence of recombinant synapsis is to increase genetic variability within the offspring. Repeated recombination also has the general effect of allowing genes to move independently of each other through the generations, allowing for the independent concentration of beneficial genes and the purging of the detrimental.

Following synapsis, a type of recombination referred to as synthesis dependent strand annealing (SDSA) occurs frequently. SDSA recombination involves information exchange between paired non-sister homologous chromatids, but not physical exchange. SDSA recombination does not cause crossing-over. Both the non-crossover and crossover types of recombination function as processes for repairing DNA damage, particularly double-strand breaks (see Genetic recombination).

The central function of synapsis is therefore the identification of homologues by pairing, an essential step for a successful meiosis. The processes of DNA repair and chiasma formation that take place following synapsis have consequences at many levels, from cellular survival through to impacts upon evolution itself.

## Contents

* 1 Mechanisms of homologous chromosome cohesion
* 2 Chromosome silencing
* 3 Recombination
* 4 References
* 5 External links

## Mechanisms of homologous chromosome cohesion

Homologous chromosomes are held together by several mechanisms during meiosis, ensuring their proper pairing, alignment, and recombination. These mechanisms include:

1. The synaptonemal complex (SC) is a key protein structure that physically holds homologous chromosomes together during prophase I of meiosis I, facilitating their alignment and the pairing of homologs, named synapsis.[6] The SC is composed of proteins like SYCP1, SYCP2, and SYCP3, which work together to stabilize the homologs and promote homologous or meiotic recombination, where homologous chromosomes exchange genetic material. Any flaws in its formation lead to failures in meiotic recombination, chromosome segregation, and the completion of meiosis.[7] Furthermore, incorrect segregation of homologous chromosomes during meiosis I leads to the formation of aneuploid gametes, which are a primary cause of miscarriage, infertility, and birth defects.[8]
2. Centromere pairing and Cohesin Complex: The formation of connections between homologous chromosomes, called crossovers, create links that enable homologous chromosomes to attach properly to the meiosis I spindle and ensure correct chromosome segregation. Through tension-sensing biorientation mechanisms centromere pairing establishes connections between chromosomes allowing their interdependent attachment to the meiotic spindle.[9] The SC complex interacts with the chromosome axis, directly interacting with the chromatin and the regulation of meiotic recombination.[10] Cohesin-related proteins are a key component of the chromosome axis and are particularly abundant at the centromeres of meiotic chromosomes.[11] Cohesin primarily holds sister chromatids together after DNA replication, which plays a critical role in stabilizing homologous chromosome pairing during meiosis. Once homologs pair, cohesins at the centromere regions help maintain their cohesion in the early stages of meiosis, ensuring the chromosomes remain together until the proper time for segregation. The assembly of the SC complex relies on two cohesin complexes: one essential for interhomolog interactions and another necessary for sister chromatid interactions.[10]

## Chromosome silencing

In mammals, surveillance mechanisms remove meiotic cells in which synapsis is defective. One such surveillance mechanism is meiotic silencing that involves the transcriptional silencing of genes on asynapsed chromosomes.[12] Any chromosome region, either in males or females, that is asynapsed is subject to meiotic silencing.[13] ATR, BRCA1 and gammaH2AX localize to unsynapsed chromosomes at the pachytene stage of meiosis in human oocytes and this may lead to chromosome silencing.[14] The DNA damage response protein TOPBP1 has also been identified as a crucial factor in meiotic sex chromosome silencing.[12] DNA double-strand breaks appear to be initiation sites for meiotic silencing.[12]

## Recombination

In female Drosophila melanogaster fruit flies, meiotic chromosome synapsis occurs in the absence of recombination.[15] Thus synapsis in Drosophila is independent of meiotic recombination, consistent with the view that synapsis is a precondition required for the initiation of meiotic recombination. Meiotic recombination is also unnecessary for homologous chromosome synapsis in the nematode Caenorhabditis elegans.[16]

## References

1. ↑ "Shaping meiotic prophase chromosomes: cohesins and synaptonemal complex proteins". Chromosoma 115 (3): 235–40. 2006. doi:10.1007/s00412-006-0060-x. PMID 16518630.
2. ↑ 2.0 2.1 MacQueen, Amy J.; Phillips, Carolyn M.; Bhalla, Needhi; Weiser, Pinky; Villeneuve, Anne M.; Dernburg, Abby F. (December 2005). "Chromosome Sites Play Dual Roles to Establish Homologous Synapsis during Meiosis in C. elegans" (in en). Cell 123 (6): 1037–1050. doi:10.1016/j.cell.2005.09.034. PMID 16360034.
3. ↑ "Sex chromosomes, synapsis, and cohesins: a complex affair". Chromosoma 115 (3): 250–9. 2006. doi:10.1007/s00412-006-0059-3. PMID 16544151. http://americanae.aecid.es/americanae/es/registros/registro.do?tipoRegistro=MTD&idBib=3235900.
4. ↑ McKee B (2004). "Homologous pairing and chromosome dynamics in meiosis and mitosis". Biochim Biophys Acta 1677 (1–3): 165–80. doi:10.1016/j.bbaexp.2003.11.017. PMID 15020057.
5. ↑ 5.0 5.1 Rog, Ofer; Dernburg, Abby F (June 2013). "Chromosome pairing and synapsis during Caenorhabditis elegans meiosis" (in en). Current Opinion in Cell Biology 25 (3): 349–356. doi:10.1016/j.ceb.2013.03.003. PMID 23578368.
6. ↑ Hollingsworth, Nancy M. (2004-01-01), Lennarz, William J.; Lane, M. Daniel, eds., Homologous Recombination in Meiosis, New York: Elsevier, pp. 393–397, doi:10.1016/b0-12-443710-9/00319-7, ISBN 978-0-12-443710-4, https://linkinghub.elsevier.com/retrieve/pii/B0124437109003197, retrieved 2024-12-04
7. ↑ Ortiz, Rosario; Chavero, Silvia Juárez; Echeverría, Olga M.; Hernandez-Hernandez, Abrahan (2021-02-15). "Synaptonemal complex formation produces a particular arrangement of the lateral element-associated DNA". Experimental Cell Research 399 (2). doi:10.1016/j.yexcr.2020.112455. ISSN 0014-4827. PMID 33400935. https://linkinghub.elsevier.com/retrieve/pii/S0014482720307084.
8. ↑ Nagaoka, So I.; Hassold, Terry J.; Hunt, Patricia A. (July 2012). "Human aneuploidy: mechanisms and new insights into an age-old problem" (in en). Nature Reviews Genetics 13 (7): 493–504. doi:10.1038/nrg3245. ISSN 1471-0064. PMID 22705668.
9. ↑ Evatt, Jared M.; Sadli, Asli D.; Rapacz, Bartosz K.; Chuong, Hoa H.; Meyer, Régis E.; Ridenour, John B.; Donczew, Rafal; Dawson, Dean S. (May 2024). "Centromere pairing enables correct segregation of meiotic chromosomes". Current Biology 34 (10): 2085–2093.e6. doi:10.1016/j.cub.2024.04.008. ISSN 0960-9822. PMID 38670094. Bibcode: 2024CBio...34.2085E.
10. ↑ 10.0 10.1 Gyuricza, Mercedes R.; Manheimer, Kathryn B.; Apte, Vandana; Krishnan, Badri; Joyce, Eric F.; McKee, Bruce D.; McKim, Kim S. (July 2016). "Dynamic and Stable Cohesins Regulate Synaptonemal Complex Assembly and Chromosome Segregation" (in en). Current Biology 26 (13): 1688–1698. doi:10.1016/j.cub.2016.05.006. PMID 27291057. Bibcode: 2016CBio...26.1688G.
11. ↑ Glynn, Earl F.; Megee, Paul C.; Yu, Hong-Guo; Mistrot, Cathy; Unal, Elcin; Koshland, Douglas E.; DeRisi, Joseph L.; Gerton, Jennifer L. (2004-07-27). "Genome-Wide Mapping of the Cohesin Complex in the Yeast Saccharomyces cerevisiae" (in en). PLOS Biology 2 (9). doi:10.1371/journal.pbio.0020259. ISSN 1545-7885. PMID 15309048.
12. ↑ 12.0 12.1 12.2 "DNA damage response protein TOPBP1 regulates X chromosome silencing in the mammalian germ line". Proc. Natl. Acad. Sci. U.S.A. 114 (47): 12536–12541. 2017. doi:10.1073/pnas.1712530114. PMID 29114052. Bibcode: 2017PNAS..11412536E.
13. ↑ "Meiotic Silencing in Mammals". Annu. Rev. Genet. 49: 395–412. 2015. doi:10.1146/annurev-genet-112414-055145. PMID 26631513.
14. ↑ "ATR, BRCA1 and gammaH2AX localize to unsynapsed chromosomes at the pachytene stage in human oocytes". Reprod. Biomed. Online 18 (1): 37–44. 2009. doi:10.1016/s1472-6483(10)60422-1. PMID 19146767.
15. ↑ "Meiotic synapsis in the absence of recombination". Science 279 (5352): 876–8. 1998. doi:10.1126/science.279.5352.876. PMID 9452390. Bibcode: 1998Sci...279..876M.
16. ↑ "Meiotic recombination in C. elegans initiates by a conserved mechanism and is dispensable for homologous chromosome synapsis". Cell 94 (3): 387–98. 1998. doi:10.1016/s0092-8674(00)81481-6. PMID 9708740.

## External links

* UC Berkeley video of chromosome end migration and match assessment during prophase

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