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Complete Sequence of the 22q11.2 Allele in 1,053 Subjects with 22q11.2 Deletion Syndrome Reveals Modifiers of Conotruncal Heart Defects.
American Journal of Human Genetics ( IF 9.8 ) Pub Date : 2019-12-20 , DOI: 10.1016/j.ajhg.2019.11.010
Yingjie Zhao 1 , Alexander Diacou 1 , H Richard Johnston 2 , Fadi I Musfee 3 , Donna M McDonald-McGinn 4 , Daniel McGinn 4 , T Blaine Crowley 4 , Gabriela M Repetto 5 , Ann Swillen 6 , Jeroen Breckpot 6 , Joris R Vermeesch 6 , Wendy R Kates 7 , M Cristina Digilio 8 , Marta Unolt 9 , Bruno Marino 10 , Maria Pontillo 11 , Marco Armando 12 , Fabio Di Fabio 10 , Stefano Vicari 13 , Marianne van den Bree 14 , Hayley Moss 14 , Michael J Owen 14 , Kieran C Murphy 15 , Clodagh M Murphy 16 , Declan Murphy 16 , Kelly Schoch 17 , Vandana Shashi 17 , Flora Tassone 18 , Tony J Simon 18 , Robert J Shprintzen 19 , Linda Campbell 20 , Nicole Philip 21 , Damian Heine-Suñer 22 , Sixto García-Miñaúr 23 , Luis Fernández 23 , 24 , Carrie E Bearden 25 , Claudia Vingerhoets 26 , Therese van Amelsvoort 26 , Stephan Eliez 27 , Maude Schneider 27 , Jacob A S Vorstman 28 , Doron Gothelf 29 , Elaine Zackai 4 , A J Agopian 3 , Raquel E Gur 30 , Anne S Bassett 31 , Beverly S Emanuel 4 , Elizabeth Goldmuntz 32 , Laura E Mitchell 3 , Tao Wang 33 , Bernice E Morrow 1
Affiliation  

The 22q11.2 deletion syndrome (22q11.2DS) results from non-allelic homologous recombination between low-copy repeats termed LCR22. About 60%-70% of individuals with the typical 3 megabase (Mb) deletion from LCR22A-D have congenital heart disease, mostly of the conotruncal type (CTD), whereas others have normal cardiac anatomy. In this study, we tested whether variants in the hemizygous LCR22A-D region are associated with risk for CTDs on the basis of the sequence of the 22q11.2 region from 1,053 22q11.2DS individuals. We found a significant association (FDR p < 0.05) of the CTD subset with 62 common variants in a single linkage disequilibrium (LD) block in a 350 kb interval harboring CRKL. A total of 45 of the 62 variants were associated with increased risk for CTDs (odds ratio [OR) ranges: 1.64-4.75). Associations of four variants were replicated in a meta-analysis of three genome-wide association studies of CTDs in affected individuals without 22q11.2DS. One of the replicated variants, rs178252, is located in an open chromatin region and resides in the double-elite enhancer, GH22J020947, that is predicted to regulate CRKL (CRK-like proto-oncogene, cytoplasmic adaptor) expression. Approximately 23% of patients with nested LCR22C-D deletions have CTDs, and inactivation of Crkl in mice causes CTDs, thus implicating this gene as a modifier. Rs178252 and rs6004160 are expression quantitative trait loci (eQTLs) of CRKL. Furthermore, set-based tests identified an enhancer that is predicted to target CRKL and is significantly associated with CTD risk (GH22J020946, sequence kernal association test (SKAT) p = 7.21 × 10-5) in the 22q11.2DS cohort. These findings suggest that variance in CTD penetrance in the 22q11.2DS population can be explained in part by variants affecting CRKL expression.

中文翻译:

1,053例患有22q11.2缺失综合征的受试者中22q11.2等位基因的完整序列揭示了共切合性心脏缺陷的修饰因子。

22q11.2缺失综合征(22q11.2DS)是由称为LCR22的低拷贝重复序列之间的非等位基因同源重组引起的。从LCR22A-D中删除典型的3兆碱基(Mb)的个体中,约60%-70%患有先天性心脏病,大部分为锥鼻型(CTD),而其他人则具有正常的心脏解剖结构。在这项研究中,我们根据来自1,053个22q11.2DS个体的22q11.2区的序列,测试了半合LCR22A-D区的变异是否与CTD风险相关。我们发现,在一个包含CRKL的350 kb间隔内,单个连锁不平衡(LD)区块中的CTD子集与62个常见变体之间存在显着关联(FDR p <0.05)。62个变体中的45个与CTD风险增加相关(比值比[OR]范围:1.64-4.75)。在没有22q11.2DS的受影响个体中,对CTDs的三项全基因组关联研究的荟萃分析中复制了四个变异体的关联。rs178252是复制的变体之一,位于开放的染色质区域中,位于双精英增强子GH22J020947中,预计可调节CRKL(CRK样原癌基因,细胞质衔接子)的表达。约有23%具有嵌套LCR22C-D缺失的患者患有CTD,而小鼠Crk1失活会导致CTD,因此暗示该基因是修饰基因。Rs178252和rs6004160是CRKL的表达定量性状基因座(eQTL)。此外,在22q11.2DS队列中,基于组的测试确定了一种增强剂,该增强剂预计将靶向CRKL,并且与CTD风险显着相关(GH22J020946,序列内核关联测试(SKAT)p = 7.21×10-5)。
更新日期:2019-12-20
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