Genomic
DNA from 170 unrelated
hemophilia A patients was examined for gene defects in the coding region of the
Factor VIII gene. Exons 18, 22-24 and 26 contain a CGA
codon for
arginine within the recognition sequence for the restriction
enzyme Taq I. These five sites were amplified by the polymerase chain reaction and tested for abnormal Taq I restriction patterns. In five cases, the
enzyme Taq I failed to digest the amplified fragments. Direct sequencing of the amplified products demonstrated a C to T transition in the coding strand of exons 18, 22 and 24 in three severe
hemophilia A patients resulting in TGA
termination codons. Two patients showed G to A transition in exons 24 and 26 reflecting a C to T transition in the non-coding strand substituting a
glutamine for an
arginine. Three deletions involving exon 26 and one exons 23-26 were found in severe hemophiliac patients. In contrast, exons 23 and 24 failed to amplify in one patient with a moderate form of the disease suggesting an in-frame splicing of exons 22 and 25. Exon 8 and the 3' end of exon 14 were analyzed by denaturing gradient gel electrophoresis (DGGE). Two patients with a moderate form of the disease demonstrated an abnormal electrophoretic pattern in exon 8 and sequencing demonstrated missense mutations at
codon 372 for
arginine within a
thrombin activation site. One missense mutation was a C to T transition substituting
cysteine for
arginine and the other was an infrequent G to C transversion at an adjacent
nucleotide changing the same
arginine to
proline.(ABSTRACT TRUNCATED AT 250 WORDS)