Structure and regulation of the chicken erythroid δ-aminolevulinate synthase gene

Kim chew Lim, Hajime Ishihara, Robert D. Riddle, Zhuoying Yang, Nancy Andrews, Masayuki Yamamoto, James Douglas Engel

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Erythroid cells regulate heme biosynthesis in a manner that is distinct from all other cell types. While heme negatively regulates the synthesis of the housekeeping δ-amlnolevullnate synthase (ALAS-N) in all non-erythrold cells, the expression of an erythroid-speclfic isozyme (ALAS-E) is developmentally regulated in red blood cells. As a first step towards understanding the molecular basis for the transcrlptional regulation of ALAS-E during erythropolesis, we cloned and characterized the chicken ALAS-E locus. This gene spans 18 kbp and is composed of eleven exons. The intron/exon structure of erythroid ALAS was found to be conserved among several vertebrate species. Direct RNA sequencing identified a 5′ untranslated region that is derived from two contiguous exons and is predicted to form a very stable stem-loop structure that bears resemblance to the ferrltln iron-responsive element. Tissue-specific expression of the ALAS-E gene was analyzed by transient transfectlon assays in hematopoietlc cells of both erythroid and non-erythroid origins. These experiments identified distal (-784 to -505 bp) and proximal (-155 to +21 bp) promoter elements which are required for high level, erythroid-speclfic transcription.

Original languageEnglish
Pages (from-to)1226-1233
Number of pages8
JournalNucleic Acids Research
Issue number7
Publication statusPublished - 1994 Apr 11


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