Chromosome imbalances in syndromic hearing loss

The cause of hearing impairment has not been elucidated in a large proportion of patients. We screened by 1-Mb array-based comparative genomic hybridization (aCGH) 29 individuals with syndromic hearing impairment whose clinical features were not typical of known disorders. Rare chromosomal copy number changes were detected in eight patients, four de novo imbalances and four inherited from a normal parent. The de novo alterations define candidate chromosome segments likely to harbor dosage-sensitive genes related to hearing impairment, namely 1q23.3-q25.2, 2q22q23, 6p25.3 and 11q13.2-q13.4. The rare imbalances also present in normal parents might be casually associated with hearing impairment, but its role as a predisposition gene remains a possibility. Our results show that syndromic deafness is frequently associated with chromosome microimbalances (14-27%), and the use of aCGH for defining disease etiology is recommended.

Genomic imbalances associated with mullerian aplasia

Background: Aplasia of the mullerian ducts leads to absence of the uterine corpus, uterine cervix, and upper (superior) vagina. Patients with mullerian aplasia (MA) often exhibit additional clinical features such as renal, vertebral and cardiac defects. A number of different syndromes have been associated with MA, and in most cases its aetiology remains poorly understood. Objective and methods: 14 syndromic patients with MA and 46, XX G-banded karyotype were screened for DNA copy number changes by similar to 1 Mb whole genome bacterial artificial chromosome (BAC) array based comparative genomic hybridisation (CGH). The detected alterations were validated by an independent method and further mapped by high resolution oligo-arrays. Results: Submicroscopic genomic imbalances affecting the 1q21.1, 17q12, 22q11.21, and Xq21.31 chromosome regions were detected in four probands. Presence of the alterations in the normal mother of one patient suggests incomplete penetrance and/or variable expressivity. Conclusion: 4 of the 14 patients (29%) were found to have cryptic genomic alterations. The imbalances on 22q11.21 support recent findings by us and others that alterations in this chromosome region may result in impairment of mullerian duct development. The remaining imbalances indicate involvement of previously unknown chromosome regions in MA, and point specifically to LHX1 and KLHL4 as candidate genes.