title: Factor XIII ABristol 1: detection of a nonsense mutation (Arg171-->stop codon) in factor XIII A subunit deficiency.
abstract: Molecular analysis has been performed on a patient with coagulation factor XIII A subunit deficiency. A previously published genomic sequence indicates that exon 4 of the factor XIII A subunit gene contains two TaqI restriction sites within which arginine (CGA)-->stop (TGA) nonsense mutations are possible. Oligonucleotide primers were therefore used to amplify exon 4 by the polymerase chain reaction. TaqI digestion of the 326 base pair (bp) product derived from normal genomic DNA yielded expected fragments of 244, 73 and 9 bp in size. In the case of the patient, however, an additional fragment of 253 bp was present. Direct sequence analysis showed that the 5' TaqI site had been lost from one allele by a C-->T transition at nucleotide 598. Family studies demonstrated the mutation in the patient's father but no other first-degree relatives. This is the third independent mutation described in the factor XIII A subunit gene and the first to be identified in a patient compound heterozygous for the disorder.
authors.affiliation: Department of Haematology, Bristol Royal Infirmary.
authors.forename: G R
authors.initials: GR
authors.lastname: Standen
authors.forename: D J
authors.initials: DJ
authors.lastname: Bowen
mesh_terms: D000328:Adult; D001483:Base Sequence; D003062:Codon; D005176:Factor XIII / Q000235:genetics; D005177:Factor XIII Deficiency / Q000235:genetics*; D005260:Female; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D010375:Pedigree; D016133:Polymerase Chain Reaction
chemical_list: D003062:Codon; D005176:Factor XIII