Shaji RV, Eunice SE, Baidya S, Srivastava A, Chandy M. Determination of the breakpoint and molecular diagnosis of a common α-thalassaemia-1 deletion in the Indian population.
Br J Haematol 2003;
123:942-7. [PMID:
14632787 DOI:
10.1046/j.1365-141.2003.04704.x]
[Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The previously described South African type alpha-thalassaemia-1 mutation was identified in Indian HbH patients using a polymerase chain reaction (PCR) strategy. A multiplex PCR assay was devised to detect heterozygotes and homozygotes. This alpha-thalassaemia-1 mutation was found to be the commonest determinant causing HbH disease in this population. In one family this mutation was found in combination with a novel splice donor mutation alpha2 IVS I-1 (G-->A). Characterization of the breakpoint junction sequence revealed, in addition to a 23 kb deletion, that there was an addition of approximately 160 bp bridging the breakpoints. Similar to other deletions in the alpha-globin gene cluster, there is an Alu repeat-mediated mechanism for the origin of the deletion.
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