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. 1984 Oct;4(10):1978–1984. doi: 10.1128/mcb.4.10.1978

Molecular structure of the human argininosuccinate synthetase gene: occurrence of alternative mRNA splicing.

S O Freytag, A L Beaudet, H G Bock, W E O'Brien
PMCID: PMC369014  PMID: 6095035

Abstract

The human genome contains one expressed argininosuccinate synthetase gene and ca. 14 pseudogenes that are dispersed to at least 11 human chromosomes. Eleven clones isolated from a human genomic DNA library were characterized extensively by restriction mapping, Southern blotting, and nucleotide sequencing. These 11 clones represent the entire expressed argininosuccinate synthetase gene that spans 63 kilobases and contains at least 13 exons. The expressed gene codes for two mRNAs that differ in their 5' untranslated sequences and arise by alternative splicing involving the inclusion or deletion of an entire exon. In normal human liver and cultured fibroblasts, the predominant mature argininosuccinate synthetase mRNA lacks sequences encoded by exon 2 in the expressed gene. In contrast, the predominant argininosuccinate synthetase mRNA in baboon liver contains exon 2 sequences. A transformed canavanine-resistant human cell line in which argininosuccinate synthetase activity is 180-fold higher than that in wild-type cells contains abundant amounts of both forms of the argininosuccinate synthetase mRNA. The mRNA lacking exon 2 sequences is the more abundant mRNA species in the canavanine-resistant cells. These observations show that splicing of the argininosuccinate synthetase mRNA is species specific in primates and varies among different human cell types.

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Selected References

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