Cytogenomic aberrations in isolated multicystic dysplastic kidney in children.

BACKGROUND: Multicystic dysplastic kidney (MCDK) is a common form of congenital kidney anomaly. The cause of MCDK is unknown. We investigated whether MCDK in children is linked to cytogenomic aberrations. METHODS: We conducted array comparative genomic hybridization (aCGH) in ten unrelated children with MCDK. The pattern of inheritance was determined by real-time PCR in patients and their biological parents. RESULTS: Pathogenic aberrations were detected in three patients: a deletion at 7p14.3 with a size of 2.07 Mb housing 12 genes, including BBS9 (Bardet-Biedl syndrome 9) and BMPER (BMP binding endothelial regulator); a duplication at 16p13.11p12.3 with a size of 3.28 Mb that included >20 genes; and monosomy X for a female patient. The deletion at 7p14.3 was inherited from the patient's father, while the duplication at 16p13.11p12.3 was derived from the patient's mother. CONCLUSIONS: Up to 30% of patients with MCDK possess cytogenomic aberrations. BBS9 and BMPER variants have been reported to result in cystic kidney dysplasia, suggesting a possible pathogenic function for the deletion at 7p14.3 in children with MCDK. The duplication at 16p13.11p12.3 was not reported previously to associate with MCDK. Both variations were inherited from parents, indicating hereditary contributions in MCDK. Thus, aCGH is an informative tool to unravel the pathogenic mechanisms of MCDK. IMPACT: Cytogenomic aberrations are common in children with MCDK. Cytogenomic aberrations are inherited from parents, indicating hereditary contributions in MCDK. aCGH is a valuable tool to reveal pathogenic mechanisms of MCDK.