Abstract
The genes for four components (C) of complement in the human major histocompatibility complex (HLA) have been aligned previously in a series of overlapping cosmid cloned inserts. Those inserts, which contained the two C4 genes C4A and C4B, hybridized with human adrenal mRNA, indicating that they contain a gene expressed in the adrenal. The mRNA fraction of 2.4 kilobases (kb) hybridizes with genomic DNA of 4.5 kb, which is duplicated and lies about 1.5 kb 3' of both the C4A and the C4B complement genes. Sequencing of a 430-base section and comparison with the published cDNA sequence of bovine cytochrome P-450 21-hydroxylase, peptide sequences of porcine 21-hydroxylase, and a cDNA sequence of a rat liver cytochrome P-450 identified the gene as coding for human steroid 21-hydroxylase [steroid,hydrogen-donor:oxygen oxidoreductase (21-hydroxylating), EC 1.14.99.10]. Mapping of the gene was helped by use of a synthetic oligonucleotide based on the bovine cDNA sequence.
MeSH Terms
Adrenal Glands/analysis
Amino Acid Sequence
Animals
Base Sequence
Cattle
Cloning, Molecular
Complement C4/genetics
Complement C4a
Complement C4b
DNA/analysis
Humans
Major Histocompatibility Complex
Nucleic Acid Hybridization
RNA, Messenger/analysis
Rats
Steroid 21-Hydroxylase/genetics
Steroid Hydroxylases/genetics
Swine
Chemicals
Complement C4
RNA, Messenger
Complement C4a
Complement C4b
DNA
Steroid Hydroxylases
Steroid 21-Hydroxylase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Carroll M C
Campbell R D
Porter R R
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19 references, click to expand
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