Homozygosity mapping in 64 Syrian consanguineous families with non-specific intellectual disability reveals 11 novel loci and high heterogeneity

Homozygosity mapping in 64 Syrian consanguineous families with non-specific intellectual disability reveals 11 novel loci and high heterogeneity
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DOI:
10.1038/ejhg.2011.98
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发表时间:
2011-11-01
影响因子:
5.2
通讯作者:
Reis, Andre
Reis, Andre
中科院分区:
生物学2区
文献类型:
--
作者:
Abou Jamra, Rami;Wohlfart, Sigrun;Reis, Andre

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常染色体隐性遗传的非特异性智力残疾(NS-ARID)是严重认知功能障碍的重要组成部分。到目前为止,只有10个基因已被确定,并进一步24个连锁的ARID位点已被报道,以及其他与暗示连锁。为了发现新的基因引起的NS-ARID,我们进行了全基因组纯合性定位在64个叙利亚血统的血缘多重家庭。在11个家系中发现了4 q26 - 4 q28(MRT 17)、6 q12-q15(MRT 18)、18 p11(MRT 19)、16 p12-q12(MRT 20)、11 p15(MRT 21)、11 p13-q14(MRT 23)、6p 12(MRT 24)、12 q13-q15(MRT 25)、14 q11-q12(MRT 26)、15 q23-q26(MRT 27)和6 q26-q27(MRT 28)。基因座长度在1.2 ~ 45.6Mb之间。一个家族显示与染色体8q24.3连锁,我们在TRAPPC 9中发现了一个突变。我们的研究进一步强调了NS-ARID的极端异质性,并表明至少在本研究组中,预计不会有主要的疾病基因。如本文所述,对大量受影响家庭的系统分析将有助于发现ID的遗传原因。European Journal of Human Genetics(2011)19,1161-1166; doi:10.1038/ejhg.2011.98; 2011年6月1日在线发表
Non-specific intellectual disability of autosomal recessive inheritance (NS-ARID) represents an important fraction of severe cognitive dysfunction disorders. To date, only 10 genes have been identified, and further 24 linked-ARID loci have been reported, as well as others with suggestive linkage. To discover novel genes causing NS-ARID, we undertook genome-wide homozygosity mapping in 64 consanguineous multiplex families of Syrian descent. A total of 11 families revealed unique, significantly linked loci at 4q26-4q28 (MRT17), 6q12-q15 (MRT18), 18p11 (MRT19), 16p12-q12 (MRT20), 11p15 (MRT21), 11p13-q14 (MRT23), 6p12 (MRT24), 12q13-q15 (MRT25), 14q11-q12 (MRT26), 15q23-q26 (MRT27), and 6q26-q27 (MRT28), respectively. Loci ranged between 1.2 and 45.6Mb in length. One family showed linkage to chromosome 8q24.3, and we identified a mutation in TRAPPC9. Our study further highlights the extreme heterogeneity of NS-ARID, and suggests that no major disease gene is to be expected, at least in this study group. Systematic analysis of large numbers of affected families, as presented here, will help discovering the genetic causes of ID. European Journal of Human Genetics (2011) 19, 1161-1166; doi:10.1038/ejhg.2011.98; published online 1 June 2011