Open AccessClinical Application of an Innovative Multiplex-Fluorescent-Labeled STRs Assay for Prader-Willi Syndrome and Angelman Syndrome
Author(s) -
Kaihui Zhang,
Shu Liu,
Bing Feng,
Yali Yang,
Haiyan Zhang,
Rui Dong,
Yi Liu,
Zhongtao Gai
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0147824
Subject(s) - angelman syndrome , uniparental disomy , genomic imprinting , genetics , multiplex , biology , imprinting (psychology) , ube3a , comparative genomic hybridization , genetic linkage , dna methylation , gene , chromosome , karyotype , ubiquitin ligase , gene expression , ubiquitin
Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are two clinically distinct neurodevelopmental disorders caused by absence of paternally or maternally expressed imprinted genes on chr15q11.2-q13.3. Three mechanisms are known to be involved in the pathogenesis: microdeletions, uniparental disomy (UPD) and imprinting defects. Both disorders are difficult to be definitely diagnosed at early age if no available molecular cytogenetic tests. In this study, we identified 5 AS patients with the maternal deletion and 26 PWS patients with paternal deletion on chr15q11-q13 by using an innovative multiplex-fluorescent-labeled short tandem repeats (STRs) assay based on linkage analysis, and validated by the methylation-specific PCR and array comparative genomic hybridization techniques. More interesting, one of these PWS patients was confirmed as maternal uniparental isodisomy by the STR linkage analysis. The phenotypic and genotypic characteristics of these individuals were also presented. Our results indicate that the new linkage analysis is much faster and easier for large-scale screening deletion and uniparental disomy, thus providing a valuable method for early diagnosis of PWS/AS patients, which is critical for genetic diagnosis, management and improvement of prognosis.