The 2p partial trisomy syndrome. Duplication of region 2p23 leads to 2pter in two members of a t(2;7) translocation kindred.

Strikingly similar abnormalities were present in two severely retarded children, an 8-year-old boy and a 12-year-old girl, who were first cousins once removed. Dysmorphic features included high bulging forehead with frontal upsweep of hair, flat, wide glabella and nasal bridge, maxillary hypoplasia, ptosis, dacryostenosis, dolichostenomelia, hyperextensible fingers with subluxation in proximal interphalangeal joints, hypoplastic external genitalia, and overconstriction of the shafts of all long bones. Both patients had unbalanced karyotypes, with duplication of the distal third of the short arm of chromosome 2, resulting from the same balanced reciprocal translocation prestne in both mothers: der (2), t(2;7)(p23;q36)mat. Seven additional translocation carriers were identified in four generations of this kindred.