Abstract
Use of a 4.5-kilobase-pair (kb) segment of single-copy DNA from a human genomic library as a hybridization probe of genomic human DNAs revealed allelic Taq I restriction fragments 10.6, 11.8, and 14.6 kb long. Among 12 unrelated individuals, all 6 males exhibited the 14.6-kb fragment in addition to one of the other fragments. Three of the females displayed 10.6- and 11.8-kb fragments, and the other three displayed only one fragment length; none had the 14.6-kb fragment. Hybridization of this probe to Taq I-digested DNAs from human-rodent hybrid cell lines (which have partial complements of human chromosomes) demonstrated segregation of the 14.6-kb fragment with the human Y chromosome and segregation of the 10.6- and 11.8-kb fragments with the human X chromosome. Furthermore, hybridization of this probe to Taq I-digested DNAs from 48 members of a single kindred revealed Y-linked inheritance of the 14.6-kb fragment and X-linked inheritance of the 10.6- and 11.8-kb fragments. These experiments demonstrate homology between single-copy sequences on the human X and Y chromosomes.
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