title: Isolation and characterization of human factor IX cDNA: identification of Taq I polymorphism and regional assignment.
abstract: Hemophilia B or Christmas disease is an X-linked condition caused by absent or reduced levels of functional coagulation factor IX. Based upon the peptide sequence of bovine factor IX, we synthesized a 17-base pair oligonucleotide probe to screen a human liver cDNA library. A recombinant clone was identified with a 917-nucleotide insert whose sequence corresponds to 70% of the coding region of human factor IX. This factor IX cDNA was used to probe restriction endonuclease digested human DNA to identify a Taq I polymorphism associated with the genomic factor IX gene as well as to verify that there is a single copy of this gene per haploid genome. The factor IX cDNA was also used to map the locus for factor IX to a region from Xq26 to Xqter. The cloning of human factor IX cDNA and identification of a Taq I polymorphism and its regional localization will provide a means to study the molecular genetics of hemophilia B and permit linkage analysis with nearby loci.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004247:DNA / Q000302:isolation & purification*; D004262:DNA Restriction Enzymes; D005164:Factor IX / Q000235:genetics*; D005796:Genes; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics; D007739:L Cells / Q000201:enzymology; D007945:Leukemia, Lymphoid; D051379:Mice; D009693:Nucleic Acid Hybridization; D011110:Polymorphism, Genetic
chemical_list: D005164:Factor IX; D004247:DNA; D007041:Hypoxanthine Phosphoribosyltransferase; D004262:DNA Restriction Enzymes