Molecular diversity of hemoglobin H disease in India.
This study was undertaken to evaluate the variable clinical expression of hemoglobin (Hb) H disease in India. For the study, alpha genotyping was done in 8 patients with Hb H disease using multiplex polymerase chain reaction and DNA sequencing. The study revealed that 4 genotypes (- -(SEA)/ -alpha(3.7), - -(SA)/-alpha(3.7), - -(SEA)/-alpha(3.7 Sallanches), - -alpha(3.7)/-alpha(3.7 Sallanches)) were responsible for Hb H disease, the alpha+ thalassemia mutation (-alpha(3.7) deletion) being the most common defect. The nondeletional mutation Hb Sallanches (alpha 2 codon 104 G --> A) was seen in 3 cases. Two unique and novel genotypes leading to Hb H disease were characterized (- -(SEA)/-alpha(3.7 Sallanches) and -alpha(3.7)/-alpha(3.7 Sallanches)). Because a majority of patients with Hb H disease do not have severe manifestations, prenatal diagnosis is usually unwarranted in India.
Nadkarni
Anita H
AH
National Institute of Immunohaematology, KEM Hospital Campus, Parel, Mumbai, India.
Nair
Sona B
SB
Italia
Khushnooma Y
KY
Warang
Prashant
P
Dalvi
Madhura
M
Ghosh
Kanjaksha
K
Colah
Roshan B
RB
D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005838:Genotype; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D016133:Polymerase Chain Reaction; D017085:alpha-Thalassemia / Q000175:diagnosis / Q000235:genetics*