SCL-interrupting locus protein is a protein that in humans is encoded by the STILgene.[1][2]
This gene encodes a cytoplasmic protein implicated in regulation of the mitotic spindle checkpoint, a regulatory pathway that monitors chromosome segregation during cell division to ensure the proper distribution of chromosomes to daughter cells. The protein is phosphorylated in mitosis and in response to activation of the spindle checkpoint, and disappears when cells transition to G1 phase. It interacts with a mitotic regulator, and its expression is required to efficiently activate the spindle checkpoint. It is proposed to regulate Cdc2 kinase activity during spindle checkpoint arrest. Chromosomal deletions that fuse this gene and the adjacent locus commonly occur in T cell leukemias, and are thought to arise through illegitimate recombination events. Multiple transcript variants encoding different isoforms have been found for this gene.[2]
Homozygous mutations in the STIL gene cause primary microcephaly (small brain) in humans.
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Curry JD, Smith MT (2003). "Measurement of SIL-TAL1 fusion gene transcripts associated with human T-cell lymphocytic leukemia by real-time reverse transcriptase-PCR". Leuk. Res. 27 (7): 575–82. doi:10.1016/S0145-2126(02)00260-6. PMID12681356.
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Kumar A, Girimaji SC, Duvvari MR, Blanton SH (2009): Mutations in STIL,
encoding a pericentriolar and centrosomal protein, cause primary
microcephaly. American Journal of Human Genetics 84:286-290.