M. Aseev et al., ALLELE FREQUENCIES AND MOLECULAR DIAGNOSIS IN HEMOPHILIA-A AND HEMOPHILIA-B PATIENTS FROM RUSSIA AND FROM SOME ASIAN REPUBLICS OF THE FORMER USSR, Prenatal diagnosis, 14(7), 1994, pp. 513-522
RFLP analysis of some intra- and extra-genic polymorphic sites of Fact
or VIII (FVIII) and Factor IX (FIX) genes with relevant DNA probes or
by polymerase chain reaction (PCR) was carried out in Slavic populatio
ns from the European part of Russia and also in the native ethnic grou
ps of Uzbekistan and Kazahstan. The allele frequencies for the HindIII
(intron 19) and XbaI (intron 22) polymorphic sites (PSs) in the FVIII
gene were very similar in the two populations studied, but different
for the intron 13 (CA)n repeat. Significant variations in the TaqI (in
tron d) and DdeI (intron a) polymorphisms of the FIX gene were evident
between the Russian and Asian populations. Two unusual alleles (4.35
and 4.2 kb) for the extragenic PS St14/TaqI were registered in Slavs a
nd one new allele (380 bp) for the DdeI polymorphic site of FIX was di
scovered in both Asian populations. Altogether, 210 haemophilia A (HA)
and 24 haemophilia B (HB) families were subjected to molecular studie
s. So far, 160 HA and 12 HB families have been found to be informative
for DNA analysis. Carrier status was ascertained in 42 HA and 6 HB fe
male relatives, and rejected in 52 and 10 of them, respectively. The o
rigin of some HA and HB mutations was traced with relevant polymorphic
markers in several at-risk families. Prenatal diagnosis was accomplis
hed in 28 HA and three HB families, resulting in the identification of
20 affected male fetuses.