RT Journal Article
SR Electronic
T1 Detection of known and novel genomic rearrangements by array based comparative genomic hybridisation: deletion of ZNF533 and duplication of CHARGE syndrome genes
JF Journal of Medical Genetics
JO J Med Genet
FD BMJ Publishing Group Ltd
SP 432
OP 437
DO 10.1136/jmg.2008.057596
VO 45
IS 7
A1 S Monfort
A1 M Roselló
A1 C Orellana
A1 S Oltra
A1 D Blesa
A1 K Kok
A1 I Ferrer
A1 J C Cigudosa
A1 F Martínez
YR 2008
UL http://jmg.bmj.com/content/45/7/432.abstract
AB Background: Mental retardation can be caused by copy number variations (deletions, insertions, duplications), ranging in size from 1 kb to several megabases. Array based comparative genomic hybridisation (array-CGH) allows detection of an increasing number of genomic alterations.Methods: A series of 46 patients with mental retardation and congenital abnormalities (previously screened for subtelomeric rearrangements) were evaluated for cryptic chromosomal imbalances by array-CGH. This array contains 6465 large-insert BAC/PAC clones, representing sequences uniformly distributed throughout the human genome. The results were confirmed by alternative techniques.Results: Four pathogenic rearrangements were detected: two of them were novel, a deletion at 2q31.2 and a duplication at 8q12 band; the other two have been previously reported—a duplication of the Williams–Beuren region and a deletion of 3q29. By adding the subtelomeric alterations previously identified, a total rate of 18% of pathogenic rearrangements was found in the series.Conclusion: Based on our results, ZNF533 is the only gene contained in the overlapping region with other deletions at 2q31.2, and it is most probably the fourth zinc-finger gene implied in mental retardation. On the other hand, we propose that the CHD7 gene, associated with CHARGE syndrome by haploinsufficiency, causes a different phenotype by gain-of-dosage.