Complex cytogenetic rearrangement of chromosome 8q in a case of Ambras syndrome.

Ambras syndrome (AMS) is a unique form of congenital universal hypertrichosis. The syndrome has been found in association with rearrangements of chromosome 8 in two isolated cases. One of these patients was reported to have an apparently balanced paracentric inversion of chromosome 8, inv(8)(q12q22). Our cytogenetic analysis on this patient showed that the rearrangement of chromosome 8 is more complex than initially reported. We detected an insertion of the q23-q24 region into a more proximal region of the long arm of chromosome 8 as well as a large deletion in 8q23:46,XX, rea(8)(8pter-->8q13::8q23.2-->8q24.1::8q13-->8q23.1::8q24.1-->8qter). Given the large number of breakpoints and the presence of a substantial deletion, it is surprising that the proposita did not show anomalies other than these characteristic of Ambras syndrome.