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| Content Provider | PubMed Central |
|---|---|
| Author | Rixon, M. W. Gelinas, R. E. |
| Abstract | Single base substitutions have been identified in the promoter regions of A gamma-globin genes from individuals with certain types of nondeletion A gamma hereditary persistence of fetal hemoglobin (HPFH). The presence of these mutations is closely associated with the A gamma HPFH phenotype, but proof that they are the nondeletion HPFH determinants is lacking. To test directly whether these base substitutions can result in an increase in A gamma-globin gene transcription, we studied cosmid clones containing the G gamma- through beta-globin gene regions from individuals with Greek-type (G-to-A base substitution at -117) and Chinese-type (C-to-T base substitution at -196) A gamma HPFH in a transient expression assay. When tested as part of a cosmid clone, the Greek HPFH A gamma-globin gene consistently produced about 1.4 times as much RNA as the wild-type A gamma-globin gene when standardized against RNA transcribed from the G gamma genes in cis. The relative strengths of the normal and HPFH A gamma-globin gene promoters were also compared in transient expression assays with plasmids containing the A gamma-globin genes. Pseudo-wild-type A gamma-globin genes containing a short, transcriptionally neutral deletion were used so that two A gamma-globin genes that differed in their promoter sequences could be compared in the same transfection. The plasmid transient expression results indicated a 1.3- to 1.4-fold increase in steady-state RNA levels from the Greek-type A gamma HPFH promoter compared with the wild-type A gamma promoter, while no difference was documented between the Chinese-type A gamma HPFH promoter and the wild-type A gamma promoter. |
| Starting Page | 713 |
| File Format | |
| ISSN | 10985549 |
| e-ISSN | 10985549 |
| Journal | Molecular and Cellular Biology |
| Issue Number | 2 |
| Volume Number | 8 |
| Language | English |
| Publisher Date | 1988-02-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology |
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