Journal
AMERICAN JOURNAL OF MEDICAL GENETICS PART A
Volume 152A, Issue 7, Pages 1711-1717Publisher
WILEY
DOI: 10.1002/ajmg.a.33478
Keywords
chromosome 21; mental retardation; array-CGH; 21q interstitial deletion; thrombocytopenia
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Funding
- Telethon [GTB07001]
- University of Siena [PAR 2006]
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During the last few years, an increasing number of microdeletion/microduplication syndromes have been delineated. This rapid evolution is mainly due to the availability of microarray technology as a routine diagnostic tool. Microdeletions of the 21q22.11q22.12 region encompassing the RUNX1 gene have been reported in nine patients presenting with syndromic thrombocytopenia and mental retardation. RUNX1 gene is responsible for an autosomal dominant platelet disorder with predisposition to acute myelogenous leukemia. We report on three novel patients with an overlapping de novo interstitial deletion involving the band 21q22 characterized by array-CGH. All our patients presented with severe developmental delay, dysmorphic features, behavioral problems, and thrombocytopenia. Comparing the clinical features of our patients with the overlapping ones already reported two potential phenotypes related to 21q22 microdeletion including RUNXI were highlighted: thrombocytopenia with mild dysmorphic features and syndromic thrombocytopenia with growth and developmental delay. (C) 2010 Wiley-Liss, Inc.
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