A pericentric inversion of a chromosome 4 with a t(4q+10p-) and a familial t(DqDq) in a mentally retarded girl

A homozygote for pericentric inversion of chromosome 4

A child with developmental and language delay was found to be homozygous for a pericentric inversion of chromosome 4 (inv(4) (p15 X 2q12)). Her normal mother and aunt are inversion heterozygotes. It is suggested that the phenotypic abnormalities may have resulted from damage at chromosomal breakpoints or from a position effect which is expressed only in homozygous form.