Identification of two novel beta zero-thalassemia mutations in a Filipino family: frameshift codon 67 (-TG) and a beta-globin gene deletion.
The frequency of beta-thalassemia alleles among Filipinos is estimated to be 0.02, although little is known about the actual mutations represented in this population. Here, we describe a Filipino family in which a child has severe beta-thalassemia major. Molecular studies of the family revealed that the proband is a compound heterozygote for two previously unreported beta zero-thalassemia alleles: a frameshift mutation (-TG) at codon 67 and a deletion of the entire beta-globin gene. The 5' endpoint of this novel deletion is located approximately 3.9 kb to approximately 4.3 kb upstream of beta-globin gene, and the deletion extends 3' beyond the beta-globin gene for an undetermined distance. The occurrence of two novel beta-thalassemia alleles in a single family suggests that the Filipino population may have a unique spectrum of beta-thalassemia alleles.
Eng
B
B
Provincial Hemoglobinopathy DNA Diagnostic Laboratory, McMaster University Medical Centre, Hamilton, Ontario, Canada.
Chui
D H
DH
Saunderson
J
J
Olivieri
N F
NF
Waye
J S
JS
D000483:Alleles; D001483:Base Sequence; D003062:Codon / Q000235:genetics*; D005260:Female; D016368:Frameshift Mutation / Q000235:genetics*; D017353:Gene Deletion; D005914:Globins / Q000235:genetics*; D006801:Humans; D007223:Infant; D008297:Male; D008969:Molecular Sequence Data; D010679:Philippines / Q000208:ethnology; D017086:beta-Thalassemia / Q000235:genetics*
D003062:Codon; D005914:Globins