Array based characterization of a terminal deletion involving chromosome subband 15q26.2: an emerging syndrome associated with growth retardation, cardiac defects and developmental delay.

Summary, in English

BACKGROUND: Subtelomeric regions are gene rich and deletions in these chromosomal segments have been demonstrated to account for approximately 2.5% of patients displaying mental retardation with or without association of dysmorphic features. However, cases that report de novo terminal deletions on chromosome arm 15q are rare. METHODS: In this study we present the first example of a detailed molecular genetic mapping of a de novo deletion in involving 15q26.2-qter, caused by the formation of a dicentric chromosome 15, using metaphase FISH and tiling resolution (32 k) genome-wide array-based comparative genomic hybridization (CGH). RESULTS: After an initial characterization of the dicentric chromosome by metaphase FISH, array CGH analysis mapped the terminal deletion to encompass a 6.48 megabase (Mb) region, ranging from 93.86-100.34 Mb on chromosome 15. CONCLUSION: In conclusion, we present an additional case to the growing family of reported cases with 15q26-deletion, thoroughly characterized at the molecular cytogenetic level. In the deleted regions, four candidate genes responsible for the phenotype of the patient could be delineated: IGFR1, MEF2A, CHSY1, and TM2D3. Further characterization of additional patients harboring similar 15q-aberrations might hopefully in the future lead to the description of a clear cut clinically recognizable syndrome.

• Author: Josef Davidsson; Anna Collin; Gudrun Björkhem; Maria Soller
• Department/s: Division of Clinical Genetics; Paediatrics (Lund)
• Publishing year: 2008
• Language: English
• Publication/Series: BMC Medical Genetics
• Volume: 9
• Issue: 2
• Links: http://dx.doi.org/10.1186/1471-2350-9-2
• Document type: Journal article
• Publisher: BioMed Central (BMC)
• Topic: Medical Genetics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1471-2350