Familial partial 7q monosomy resulting from segregation of an insertional chromosome rearrangement.

Abstract
A family with an insertional type of chromosome rearrangement involving chromosomes 7 and 13 is reported. An interstitial deletion of a segment of chromosome 7 (7q32 .fwdarw. 34) had been inserted into the long arm of chromosome 13 at breakpoint q32. Segregation of this chromosome rearrangement gave rise to 3 subjects who were monosomic for the involved segment of chromosome 7. The karyotypes were: 46,XX, or XY,der(7)ins(13;7) (q32;q32q34). All 3 subjects were mentally retarded and had minor dysmorphic features. The Kidd, Colton and Kell blood group systems were investigated, but were not informative.