Carvalho Claudia M B, Pfundt Rolph, King Daniel A, Lindsay Sarah J, Zuccherato Luciana W, Macville Merryn V E, Liu Pengfei, Johnson Diana, Stankiewicz Pawel, Brown Chester W, Shaw Chad A, Hurles Matthew E, Ira Grzegorz, Hastings P J, Brunner Han G, Lupski James R
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA; Centro de Pesquisas René Rachou - FIOCRUZ, Belo Horizonte, MG 30190-002, Brazil.
Department of Human Genetics, Radboud University Medical Center Institute for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, the Netherlands.
Am J Hum Genet. 2015 Apr 2;96(4):555-64. doi: 10.1016/j.ajhg.2015.01.021. Epub 2015 Mar 19.
We investigated complex genomic rearrangements (CGRs) consisting of triplication copy-number variants (CNVs) that were accompanied by extended regions of copy-number-neutral absence of heterozygosity (AOH) in subjects with multiple congenital abnormalities. Molecular analyses provided observational evidence that in humans, post-zygotically generated CGRs can lead to regional uniparental disomy (UPD) due to template switches between homologs versus sister chromatids by using microhomology to prime DNA replication-a prediction of the replicative repair model, MMBIR. Our findings suggest that replication-based mechanisms might underlie the formation of diverse types of genomic alterations (CGRs and AOH) implicated in constitutional disorders.
我们研究了复杂基因组重排(CGRs),其由三倍体拷贝数变异(CNVs)组成,这些变异在患有多种先天性异常的受试者中伴随着拷贝数中性杂合性缺失(AOH)的扩展区域。分子分析提供了观察证据,表明在人类中,合子后产生的CGRs可通过利用微同源性引发DNA复制,在同源染色体与姐妹染色单体之间发生模板转换,从而导致区域单亲二倍体(UPD)——这是复制修复模型MMBIR的一个预测。我们的研究结果表明,基于复制的机制可能是构成性疾病中涉及的多种类型基因组改变(CGRs和AOH)形成的基础。