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JC Diaz-Chico, KG Yang, TA Stoming, DG Efremov, A Kutlar, F Kutlar, M Aksoy, C Altay, A Gurgey and Y Kilinc
Department of Cell and Molecular Biology, Medical College of Georgia,
Augusta 30912-3331.
Through the procedure of gene amplification combined with hybridization to
synthetic 19 base pair (bp) oligonucleotide probes, it has been possible to
identify nine different mutations in the DNA of 47 subjects from Turkey and
Northern Cyprus with a beta-thalassemia homozygosity. The IVS-I nucleotide
(nt) 110 G----A and the IVS-I nt 6 T----C substitutions and the frameshift
at codon 8 were most frequently observed. Direct correlations were made
between these data and clinical observations; mild disease was associated
with homozygosity for IVS-I nt 6 T----C, for frameshift at codon 8, for the
C----G substitution at nt -87, and for IVS-I nt 5 G----T, and for a double
heterozygosity for some of these conditions. Moderate disease, observed in
some of the patients, could be explained by combinations of specific
mutations. All mutations were associated with specific haplotypes, while in
some the observed beta zero-thalassemia was of the mild type due to a
considerable production of Hb F.
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