G gamma beta+ hereditary persistence of fetal hemoglobin: cosmid cloning and identification of a specific mutation 5' to the G gamma gene
Proc Natl Acad Sci U S A
; 81(15): 4894-8, Aug. 1984.
Artigo
em Inglês
| MedCarib
| ID: med-9328
Biblioteca responsável:
JM3.1
Localização: JM3.1; Reprint Collection
ABSTRACT
Hereditary persistence of fetal hemoglobin (HPFH) is a benign condition in which the normal shutoff of fetal hemoglobin (Hb F) production fails to occur. In the G gamma beta+ type of HPFH, erythrocytes of adult heterozygotes contain approximately equal to 20 percent Hb F, which is almost exclusively of the G gamma-globin variety, without increased levels of gamma-globin chains from the nearby A gamma-globin gene. Unlike some forms of HPFH, no major deletions in the globin gene cluster have been found by genomic blotting in the G gamma beta+ variety. We report here a family with this condition, from which cosmid clones of the beta-globin gene cluster from the G gamma beta+ HPFH allele have been obtained. Sequencing around the fetal genes has identified a point mutation 202 base pairs 5' to the G gamma-globin gene that is present in genomic DNA of 3/3 unrelated individuals with G gamma beta+ HPFH but in none of more than 100 non-HPFH individuals. Although the mutation could represent a tightly linked polymorphism, its location in a region suggested by recent data to be important in tissue-specific control of gene expression suggests the possibility that the -202 mutation accounts for the phenotype. The sequence created resembles elements of other eukaryotic promoters known to be important for efficient transcription. (AU)
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Base de dados:
MedCarib
Assunto principal:
Hemoglobina Fetal
/
Globinas
/
Regulação da Expressão Gênica
Tipo de estudo:
Estudo diagnóstico
Limite:
Feminino
/
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
1984
Tipo de documento:
Artigo