[Gonadal dysgenesis with an unusual structural anomaly in an X chromosome (45,X-46,XXq+)]

A duplication-deficiency X chromosome in a girl with severe mental retardation

Clinical and cytogenetic findings in a 14-year-old girl with severe mental retardation and partial Turner's syndrome are reported. An anomalous X was observed in the patient's karyotype. On the basis of QFQ, GAG and RBA banding studies, an Xq duplication (q12 leads to qter) and an Xp deficiency (p22 leads to pter) were apparent in this chromosome.

Turner's syndrome with a duplication-deficiency X chromosome derived from a maternal pericentric inversion X chromosome

A 31-year-old woman of short stature with severe oligomenorrhea was found to carry a duplication-deficiency X chromosome, 46,X,rec(X)dup q,inv(X)(p22q11), inherited from her mother who carried a pericentric inversion X chromosome, 46,X,inv(X)(p22q11). By a combination of autoradiography and BUdR incorporation, the duplication-deficiency X chromosome was always found to be the inactive and late replicating one. In the cultured fibroblasts with the recombinant X chromosome, some of the cells were seen to have bipartite X chromatin bodies. In the mother with inv(X), the normal and the inverted X chromosome were inactivated at random.

46, X,X-X terminal rearrangement/45, X mosaicism in a child with short stature

A phenotypically female child, investigated because of short stature, had abnormally large, often bipartite Barr bodies and a mosaicism of 45, X cells and cells with 46 chromosomes which included an exceptionally large metacentric chromosome (Xp+). G- and C-banding established that the chromosome was derived from two substantially entire X chromosomes joined short arm-to-short arm, and was likely to be an isodicentric X with functional inactivation of one centromere.