A primate-specific functional GTTT-repeat in the core promoter of CYTH4 is linked to bipolar disorder in human

等位基因 基因 生物 遗传学
作者
Maryam Rezazadeh,Jalal Gharesouran,Arash Mirabzadeh,Hamid Reza Khorram Khorshid,Akbar Biglarian,Mina Ohadi
出处
期刊:Progress in Neuro-psychopharmacology & Biological Psychiatry [Elsevier BV]
卷期号:56: 161-167 被引量:23
标识
DOI:10.1016/j.pnpbp.2014.09.001
摘要

Evidence of primate-specific genes and gene regulatory mechanisms linked to bipolar disorder (BD) lend support to evolutionary/adaptive processes in the pathogenesis of this disorder. Following a genome-scale analysis of the entire protein coding genes annotated in the GeneCards database, we have recently reported that cytohesin-4 (CYTH4) contains the longest tetra-nucleotide short tandem repeat (STR) identified in a human protein-coding gene core promoter, which may be of adaptive advantage to this species. In the current study, we analyzed the evolutionary trend of this STR across evolution. We also analyzed the functional implication and distribution of this STR in a group of patients with type 1 BD (n=233) and controls (n=262). We found that this STR is exceptionally expanded in primates (Fisher exact p<0.00003). Association was observed between type I BD and the 6-repeat allele of this STR, (GTTT)₆ (Yates corrected Χ(2)=12.68, p<0.0001, OR: 1.68). This allele is the shortest length of the GTTT-repeat identified in the human subjects studied. Consistent with that finding, excess homozygosity was observed for the shorter alleles, (GTTT)₆ and (GTTT)₇, vs. the longer alleles, (GTTT)₈ and (GTTT)₉ in the BD group (Yates corrected Χ(2)=5.18, p<0.01, 1 df, OR: 1.96). Using Dual Glo luciferase system in HEK-293 cells, a trend for gene expression repression was observed from the 6- to the 9-repeat allele (p<0.003), and the GTTT-repeat significantly down-regulated gene expression, per se (p<0.0006). This is the first evidence of a link between a primate-specific STR and a major psychiatric disorder in human. It may be speculated that the CYTH4 GTTT-repeat in primates may have conferred selective advantage to this order, reflected in neural function and neurophenotypes. The role of the CYTH4 gene in the pathogenesis of type I BD remains to be clarified in the future studies.
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