Interstitial deletion of 5q33.3q35.1 in a boy with severe mental retardation

Constitutional interstitial deletions of the long arm of chromosome 5 (5q) are quite rare, and the corresponding phenotype is not yet clearly delineated. Severe mental retardation has been described in most patients who present 5q deletions. Specifically, the interstitial deletion of chromosome 5q33...

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Bibliographic Details
Published in:Clinical and experimental pediatrics 2016, 59(0), , pp.19-24
Main Authors: Lee, Jin Hwan, Kim, Hyo Jeong, Yoon, Jung Min, Cheon, Eun Jung, Lim, Jae Woo, Ko, Kyong Og, Lee, Gyung Min
Format: Article
Language:English
Subjects:
Age
Anemia
Case Report
Chromosomal microarray
Chromosome 5
Chromosomes
Convulsions & seizures
De novo deletion
Deletion 5q
Genes
Intellectual disabilities
Mental retardation
Patients
Ultrasonic imaging
소아과학
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Summary:Constitutional interstitial deletions of the long arm of chromosome 5 (5q) are quite rare, and the corresponding phenotype is not yet clearly delineated. Severe mental retardation has been described in most patients who present 5q deletions. Specifically, the interstitial deletion of chromosome 5q33.3q35.1, an extremely rare chromosomal aberration, is characterized by mental retardation, developmental delay, and facial dysmorphism. Although the severity of mental retardation varies across cases, it is the most common feature described in patients who present the 5q33.3q35.1 deletion. Here, we report a case of a deletion of 5q33.3q35.1, 46,XY,del(5)(q33.3q35.1) in an 11-year-old boy with mental retardation; to the best of our knowledge this is the first case in Korea to be reported. He was diagnosed with severe mental retardation, developmental delay, facial dysmorphisms, dental anomalies, and epilepsy. Chromosomal microarray analysis using the comparative genomic hybridization array method revealed a 16-Mb-long deletion of 5q33. 3q35.1(156,409,412-172,584,708)x1. Understanding this deletion may help draw a rough phenotypic map of 5q and correlate the phenotypes with specific chromosomal regions. The 5q33.3q35.1 deletion is a rare condition; however, accurate diagnosis of the associated mental retardation is important to ensure proper genetic counseling and to guide patients as part of long-term management.
ISSN:1738-1061
2092-7258
2713-4148
DOI:10.3345/kjp.2016.59.11.S19