Female phenotype and multiple abnormalities in sibs with a Y chromosome and partial X chromosome duplication: H--Y antigen and Xg blood group findings.
A mentally retarded female child with multiple congenital abnormalities had an abnormal X chromosome and a Y chromosome; the karyotype was interpreted as 46,dup(X)(p21 leads to pter)Y. Prenatal chromosome studies in a later pregnancy indicated the same chromosomal abnormality in the fetus. The fetus and proband had normal female genitalia and ovarian tissue. H--Y antigen was virtually absent in both sibs, a finding consistent with the view that testis-determining genes of the Y chromosome may be suppressed by regulatory elements of the X. The abnormal X chromosome was present in the mother, the maternal grandmother, and a female sib: all were phenotypically normal and showed the karyotype 46,Xdup(X)(p21 leads to pter) with non-random inactivation of the abnormal X. Anomalous segregation of the Xga allele suggests that the Xg locus was involved in the inactivation process or that crossing-over at meiosis occurred.
D000015:Abnormalities, Multiple / Q000235:genetics*; D001789:Blood Group Antigens / Q000235:genetics*; D004261:DNA Replication; D005260:Female; D006182:H-Y Antigen / Q000235:genetics*; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D007621:Karyotyping; D008297:Male; D010375:Pedigree; D010641:Phenotype; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D014960:X Chromosome; D014998:Y Chromosome
D001789:Blood Group Antigens; D006182:H-Y Antigen