Further defining the critical genes for the 4q21 microdeletion disorder
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- 作者：Xuyun Hu ; Xiaoli Chen ; Bingbing Wu ; Irene Mademont Soler ; Shaoke Chen and Yiping Shen
- 刊名：American Journal of Medical Genetics Part A
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：173
- 期：1
- 页码：120-125
- 全文大小：224K
- ISSN：1552-4833
文摘
4q21 microdeletion syndrome (MIM: 613509) is a new genomic disorder characterized by intellectual disability, absent or severely delayed speech, growth retardation, hypotonia, variable brain malformation, and facial dysmorphism. The critical genes had been proposed based on an overlapping 1.37 Mb genomic region. No further refinement has been done since year 2010. Here, we present three cases with 4q21 deletion identified by clinical chromosomal microarray analysis. One of the cases have a de novo 761 kb deletion which is the smallest deletion ever reported at this locus. It provides an opportunity to further define the critical regions/genes associated with specific features of the 4q21 microdeletion syndrome. The evidence support the notion that PRKG2 and RASGEF1B are critical genes for intellectual disability and speech defect, and the heterogeneous nuclear ribonucleoprotein HNRNPD and HNRNPDL (previously known as HNRPDL) genes are associated with growth retardation and hypotonia.