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Heterogeneous growth patterns in carriers of chromosome 7p12.2 imbalances affecting GRB10
Author(s) -
Eggermann Thomas,
Begemann Matthias,
Gogiel Magdalena,
Palomares María,
Vallespín Elena,
Fernández Luis,
Cazorla Rosario,
Spengler Sabrina,
GarcíaMiñaúr Sixto
Publication year - 2012
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.35612
Subject(s) - genomic imprinting , locus (genetics) , grb10 , biology , imprinting (psychology) , genetics , phenotype , gene duplication , gene , beckwith–wiedemann syndrome , endocrinology , gene expression , insulin , insulin resistance , dna methylation , insulin receptor
Chromosomal duplications and deletions in 7p12.2 have been described in patients with growth disturbance phenotypes, that is, Silver–Russell and Beckwith–Wiedemann syndrome (SRS, BWS). The region harbors the imprinted GRB10/Grb10 gene which has been postulated to belong to a major fetal growth pathway. Based on its genomic localization, its physiological function and its imprinting status, GRB10/Grb10 was considered as a candidate for growth disturbance disorders. However, based on case reports with imbalances of the GRB10 locus it has been suggested that the altered GRB10 copy number should be responsible for the aberrant growth phenotype rather than an altered imprinting status of the gene. We now report on a patient with an increased height and weight in his first years of life carrying a de‐novo duplication (5.1 Mb) of paternal 7p12.2 material. The increased growth in this patient again contradicts the hypothesis that a gain of GRB10 copies leads to growth restriction. Indeed, it is necessary to compare the regions of imbalances in 7p12 and the affected genes in the different patients as other genes than GRB10 in 7p12 might cause these aberrant growth phenotypes. © 2012 Wiley Periodicals, Inc.