Abstract
A recombinant DNA sequence, lambda RB6, was isolated from a human X chromosome library and shown to be X-specific by hybridisation to DNA from a human-mouse somatic cell hybrid containing X as the only human chromosome. The cloned sequence was located on the long arm distal to Xq13 using a human-mouse somatic cell hybrid containing a partial human X chromosome. DNA samples isolated from control human females were digested with the restriction enzyme MspI, and analysed by "blotting" and hybridisation to the radioactive cloned DNA. Eight of 14 individuals from a random population showed a single hybridising band 7.5 kilobase pairs (kb) in length, but six showed an additional band 10.1 kb in length. DNA from 12 members of a family with X-linked thyroxine-binding globulin deficiency was analysed for the segregation of this polymorphism. The results show that the polymorphism is inherited in a Mendelian fashion, and that the disease locus is not closely linked to the polymorphic site. Such polymorphisms will be useful as markers for chromosome mapping and for the antenatal diagnosis of genetic diseases.
MeSH Terms
Animals
Base Sequence
Chromosome Mapping
DNA/genetics
DNA Restriction Enzymes
DNA, Recombinant
Female
Genetic Diseases, Inborn/genetics
Genetic Linkage
Humans
Hybrid Cells
Male
Mice
Pedigree
Polymorphism, Genetic
Sex Chromosomes
Thyroxine-Binding Proteins/deficiency
X Chromosome
Chemicals
DNA, Recombinant
Thyroxine-Binding Proteins
DNA
DNA Restriction Enzymes
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Hill M E
Davies K E
Harper P
Williamson R
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