Journal article

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

Melanie Leffler, Sanna Puusepp, Olga Zilina, Ying Zhu, Kati Kuuse, Nicole Bain, Trent Burgess, Katrin Ounap, Michael Field

EUROPEAN JOURNAL OF MEDICAL GENETICS | ELSEVIER SCIENCE BV | Published : 2016

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 phe..

View full abstract