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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
A 5.3-kb deletion including exon XIII of the protein S alpha gene occurs in two protein S-deficient families.
Blood 1991 Februrary 2
Genomic DNA samples from 12 protein S-deficient families with hereditary thrombophilia were analyzed by Southern hybridization using protein S cDNA probes. Protein S-deficient members of families A and B possessed identical restriction fragment length polymorphisms, which suggest the absence of 5.3 kb from one of their protein S alpha alleles. The abnormal alleles from individuals A7 and B1 were amplified by the polymerase chain reaction using a forward primer in intron K and a reverse primer in exon XIV. The amplified DNA was cloned and sequenced. Sequence comparison with the normal protein S alpha gene showed that most of intron L (roughly 4.7 kb), the entire exon XIII (151 bp), and about a quarter of intron M (407 bp) were missing from both the A7 and B1 clones. Exon XIII contains all three potential N-glycosylation sites in human protein S. This deletion may result in RNA transcripts in which exon XII is spliced to exon XIV. Such an arrangement would generate a stop codon at position 463 and consequently produce a nonglycosylated protein S molecule truncated by 173 amino acids.
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