Two familial microduplications of 15q26.3 causing overgrowth and variable intellectual disability with normal copy number of IGF1R

Abstract Terminal duplications of 15q26.3 are associated with an overgrowth phenotype, distinct facial features and intellectual disability, with the smallest reported microduplication to date being 3.16 Mb in size. We report two familial 15q26.3 microduplication cases that are less than half this s...

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Bibliographic Details
Published in:European journal of medical genetics 2016-04, Vol.59 (4), p.257-262
Main Authors: Leffler, Melanie, Puusepp, Sanna, Žilina, Olga, Zhu, Ying, Kuuse, Kati, Bain, Nicole, Burgess, Trent, Õunap, Katrin, Field, Michael
Format: Article
Language:English
Subjects:
Adult
Chromosome 15q26.3
Chromosomes, Human, Pair 15 - genetics
Female
Growth Disorders - genetics
Growth Disorders - physiopathology
Humans
In Situ Hybridization, Fluorescence
Intellectual disability
Intellectual Disability - genetics
Intellectual Disability - physiopathology
Male
Medical Education
Microduplication syndrome
Middle Aged
Pedigree
Postnatal overgrowth
Protein-Serine-Threonine Kinases - genetics
Receptor, IGF Type 1 - genetics
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Summary:Abstract Terminal duplications of 15q26.3 are associated with an overgrowth phenotype, distinct facial features and intellectual disability, with the smallest reported microduplication to date being 3.16 Mb in size. We report two familial 15q26.3 microduplication cases that are less than half this size, re-defining the minimal critical region for this duplication syndrome. In both families the duplication (albeit a complex copy number gain in one family) is associated with tall stature, early speech delay and variable cognitive problems. Neither familial copy number gains encompass the gene encoding for the insulin-like growth factor 1 receptor ( IGF1R ), the most-cited candidate for the overgrowth phenotype. In one family, whole genome sequence data and break point mapping excludes disruption of known IGF1R regulatory elements due to potential insertion within these elements. These cases highlight the possibility that the distal region of 15q contains another gene regulating human growth, with LRRK1 being a potential candidate.
ISSN:1769-7212
1878-0849
DOI:10.1016/j.ejmg.2015.12.002