[Chromosomal anomalies in children with undifferentiated forms of metal retardation based on molecular cytogenetic...

The results of cytogenetic diagnosis of 1333 children with mental retardation and congenital malformations are presented. Chromosomal aberrations and chromosomal variants (1qh+, 9qh+, 16qh+) have been detected in 181 (13.9%) cases analyzed and in 158 (11.85%) cases, respectively. Molecular cytogenetic methods have been used for diagnosis or detalization of diagnosis in 42 cases from 181 (23.2%). Independent variation (or polymorphism) of copies number of "classical" and alpha-satellite DNA sequences, forming pericentromeric regions (1qh+, 9qh+, 16qh+) has been detected in patients with chromosomal variants.