Mutations in intron 1 and intron 22 inversion negative haemophilia A patients from Western India.
Despite increased awareness and diagnostic facilities, 70-80% of the haemophilia A (HA) patients still remain undiagnosed in India. Very little data is available on prevalent mutations in HA from this country. We report fifty mutations in seventy one Indian HA patients, of which twenty were novel. Ten novel missense mutations [p.Leu11Pro (p.Leu-8Pro), p.Tyr155Ser (p.Tyr136Ser), p.Ile405Thr (p.Ile386Thr), p.Gly582Val (p.Gly563Val) p.Thr696Ile (p.Thr677Ile), p.Tyr737Cys (p.Tyr718Cys), p.Pro1999Arg (p.Pro1980Arg), p.Ser2082Thr (p.Ser2063Thr), p.Leu2197Trp (p.Leu2178Trp), p.Asp2317Glu (p.Asp2298Glu)] two nonsense [p.Lys396* (p.Lys377*), p.Ser2205* (p.Ser2186*)], one insertion [p.Glu1268_Asp1269ins (p.Glu1249_Asp1250)] and seven deletions [p.Leu882del (p.Leu863del), p.Met701del (p.Met682del), p.Leu1223del (p.Leu1204del), p.Trp1961_Tyr1962del (p.Trp1942_Tyr1943del) p.Glu1988del (p.Glu1969del), p.His1841del (p.His1822del), p.Ser2205del (p.Ser2186del)] were identified. Double mutations (p.Asp2317Glu; p.Thr696Ile) were observed in a moderate HA case. Mutations [p. Arg612Cys (p.Arg593Cys), p.Arg2326Gln (p.Arg2307Gln)] known to be predisposing to inhibitors to factor VIII (FVIII) were identified in two patients. 4.6% of the cases were found to be cross reacting material positive (CRM+ve). A wide heterogeneity in the nature of mutations was seen in the present study which has been successfully used for carrier detection and antenatal diagnosis in 10 families affected with severe to moderate HA.
Department of Thrombosis and Haemostasis, National Institute of Immunohaematology (ICMR), Mumbai, Maharashtra, India.
Preethi S
PS
Nair
Department of Thrombosis and Haemostasis, National Institute of Immunohaematology (ICMR), Mumbai, Maharashtra, India.
Shrimati D
SD
Shetty
Department of Haematology, King Edward Memorial Hospital, Mumbai, Maharashtra, India.
S
S
Chandrakala
Department of Thrombosis and Haemostasis, National Institute of Immunohaematology (ICMR), Mumbai, Maharashtra, India.
Kanjaksha
K
Ghosh
D019774:Blood Coagulation Factor Inhibitors / Q000097:blood; D005169:Factor VIII / Q000235:genetics* / Q000378:metabolism; D005260:Female; D006467:Hemophilia A / Q000097:blood / Q000453:epidemiology / Q000235:genetics*; D006801:Humans; D007194:India / Q000453:epidemiology; D007438:Introns; D008297:Male; D020125:Mutation, Missense
D019774:Blood Coagulation Factor Inhibitors; C078147:F8 protein, human; D005169:Factor VIII