Yingjun X, Yi Z, Jianzhu W, Yunxia S, Yongzhen C, Liangying Z, Xiangyi J, Qun F. Prader-Willi syndrome with a long-contiguous stretch of homozygosity not covering the critical region.
J Child Neurol 2015;
30:371-7. [PMID:
24859787 DOI:
10.1177/0883073814535492]
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Abstract
Prader-Willi syndrome is a common and complex disorder affecting multiple systems. Its main manifestations are infantile hypotonia with a poor sucking reflex, a characteristic facial appearance, mild mental retardation, hypogonadism and early-onset obesity. Prader-Willi syndrome is due to the absence of paternally expressed imprinted genes at 15q11.2-13, and 3 main mechanisms are known to be involved in its pathogenesis: paternal microdeletions, maternal uniparental disomy events, and imprinting defects. DNA methylation analysis can detect almost all individuals with Prader-Willi syndrome but is unable to distinguish between the molecular classes of the disease. Thus, additional methods are necessary to identify the molecular classes. Here, we employed chromosomal microarray analysis-single nucleotide polymorphism for diagnosis and detected a long-contiguous stretch of homozygosity on chromosome 15, which is highly predictive of maternal uniparental disomy on chromosome 15. Other methods, including fluorescence in situ hybridization, chromosomal microarray analysis-comparative genomic hybridization, genotyping and family linkage analysis, were performed for further validation. In conclusion, our study highlights the use of long-contiguous stretch of homozygosity detection for the diagnosis of Prader-Willi syndrome.
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