title: Australian beta zero-thalassaemia: a high haemoglobin A2 beta zero-thalassaemia due to a 12 kb deletion commencing 5' to the beta-globin gene.
abstract: A large novel deletional beta zero-thalassaemia mutation associated with unusually high levels of haemoglobin A2 in heterozygotes is described in an Australian family. The deletion was characterized by restriction enzyme analysis followed by PCR amplification and sequencing of the breakpoint region. Australian beta zero-thalassaemia extends from 835 basepairs (bp) 5' to the cap site of the beta-globin gene downstream for 12.023 kb. This deletion, similar to previously described deletional beta zero-thalassaemias associated with high Hb A2, removes sequences 5' to the beta-globin gene promoter and emphasizes the functional importance of the 5' beta-globin region in eliciting the unusually high Hb A2 phenotype.
authors.affiliation: Department of Molecular Genetics, Royal Prince Alfred Hospital, Camperdown, N.S.W., Australia.
authors.forename: P I
authors.initials: PI
authors.lastname: Motum
authors.forename: R
authors.initials: R
authors.lastname: Lindeman
authors.forename: T J
authors.initials: TJ
authors.lastname: Hamilton
authors.forename: R J
authors.initials: RJ
authors.lastname: Trent
mesh_terms: D001483:Base Sequence; D002872:Chromosome Deletion; D004247:DNA / Q000737:chemistry; D005190:Family; D005260:Female; D005914:Globins / Q000235:genetics*; D006443:Hemoglobin A2 / Q000032:analysis*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D021141:Nucleic Acid Amplification Techniques; D010375:Pedigree; D013789:Thalassemia / Q000097:blood / Q000235:genetics*
chemical_list: D005914:Globins; D004247:DNA; D006443:Hemoglobin A2