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Fraternal twins with Phelan-McDermid syndrome not involving the SHANK3 gene: case report and literature review.

Abstract：

BACKGROUND:Phelan-McDermid syndrome (PMS, OMIM#606232), or 22q13 deletion syndrome, is a rare genetic disorder caused by deletion of the distal long arm of chromosome 22 with a variety of clinical features that display considerably heterogeneous degrees of severity. The SHANK3 gene is understood to be the critical gene for the neurological features of this syndrome. CASE PRESENTATION:We describe one pair of boy-girl twins with a 22q13 deletion not involving the SHANK3 gene. Interestingly, the clinical and molecular findings of the two patients were identical, likely resulting from germline mosaicism in a parent. The boy-girl twins showed intellectual disability, speech absence, facial dysmorphism, cyanosis, large fleshy hands and feet, dysplastic fingernails and abnormal behaviors, and third-generation sequencing showed an identical de novo interstitial deletion of 6.0 Mb in the 22q13.31-q13.33 region. CONCLUSIONS:Our case suggests that prenatal diagnosis is essential for normal parents with affected children due to the theoretical possibility of parental germline mosaicism. Our results also indicated that other genes located in the 22q13 region may have a role in explaining symptoms in individuals with PMS. In particular, we propose that four candidate genes, CELSR1, ATXN10, FBLN1 and WNT7B, may also be involved in the etiology of the clinical features of PMS. However, more studies of smaller interstitial deletions with 22q13 are needed to corroborate our hypothesis and better define the genotype-phenotype correlation. Our findings contribute to a more comprehensive understanding of PMS.

journal_name

BMC Med Genomics

journal_title

BMC medical genomics

authors

Li S,Xi KW,Liu T,Zhang Y,Zhang M,Zeng LD,Li J

doi

10.1186/s12920-020-00802-0

subject

Has Abstract

pub_date

2020-10-06 00:00:00

pages

146

issue

1

issn

1755-8794

pii

10.1186/s12920-020-00802-0

journal_volume

13

pub_type

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