Protein C deficiency: identification of a novel two-base pair insertion and two point mutations in exon 7 of the protein C gene in Spanish families.
We have applied single-strand conformation polymorphism (SSCP) to the analysis of exon 7 of the anticoagulant protein C (PC) gene, in 13 PC-deficient Spanish families. Abnormal patterns were visualized in three samples from type I or quantitative PC deficient proposita. A previously undescribed mutation due to a TT insertion after nucleotide 6139, between codons Gly-142 and Arg-143 was found in one family. The mutation (6139,ins TT) should result in a frameshift with a stop at codon 156, which agrees with the presence of a type I or quantitative PC deficiency in the affected members of the family. The second mutation identified was a C to T transition at nucleotide 6274, 9 base pairs into intron G. This mutation (6274,C-->T), found for the first time in a Spanish family, is identical to the previously characterized PC Sant Louis. The third mutation was a G to A transition that replaces arginine 178 with glutamine (178,R-->Q). This is the third case of 178,R-->Q mutation in 17 apparently unrelated Spanish families with type I PC deficiency. Furthermore, SSCP analysis allowed the detection of another previously described mutation in a PC-deficient Spanish family (178,R-->W).
Soria
J M
JM
Molecular Genetics Department, Hospital Duran i Reynals, Barcelona, Spain.
Fontcuberta
J
J
Borrell
M
M
Estivill
X
X
Sala
N
N
D001483:Base Sequence; D004247:DNA / Q000235:genetics; D004252:DNA Mutational Analysis; D005091:Exons; D006801:Humans; D008969:Molecular Sequence Data; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011486:Protein C / Q000235:genetics*; D020151:Protein C Deficiency; D013030:Spain
D011486:Protein C; D004247:DNA