Complex chromosome rearrangements. Report of a new case and literature review

A complex and unique, apparently balanced translocation involving three autosomes and an X in a phenotypically abnormal child is described. Family studies using glucose 6 phosphate dehydrogenase as a marker provided biochemical evidence of non-random expression of this Xq locus and suggested that this de novo abnormality in the proband could be paternal in origin--the first such instance to be recorded.