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Zoology and wildlife conservation

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A novel intron site in the triosephosphate isomerase gene from the mosquito Culex tarsalis

Article Abstract:

An intron in a gene from the mosquito Culex tarsalis supports the exon- shuffling hypothesis and the idea that introns came early in evolution. The gene site is for triosephosphate isomerase, and the intron splits an exon that would have made modules for two proteins. The exon-shuffling hypothesis predicts such an intron position for the purpose of protein formation, and this would imply that introns arose at the same time as genes instead of later in evolution.

Author: Walker, Virginia K., Tittiger, Claus, Whyard, Steve
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
Genetic aspects, Mosquitoes

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Genes-in-pieces revisited

Article Abstract:

An intron in a gene of the mosquito Culex tarsalis supports the exon-shuffling hypothesis and the idea that introns came early in evolution. Claus Tittiger and colleagues found a unique intron site in the gene for triosephosphate isomerase. The intron splits an exon which would have made modules for two proteins, as the exon-shuffling hypothesis predicts. More research is needed to confirm the idea that introns came early instead of later in genetic evolution.

Author: Doolittle, W. Ford, Stoltzfus, Arlin
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993

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Why introns-in-pieces?

Article Abstract:

New evidence for the presence of self-splicing group II introns deep inside bacteria supports Cavalier-Smith's 1991 'introns-late' theory. Scientists had thought such introns existed only in chloroplast and mitochondrial genomes, but Jean-Luc Ferat and Francais Michel have found them in those organelles' bacterial antecedents. This implies revisions in theories of how introns evolve, and may prove troublesome to the 'introns-early' theory.

Author: Doolittle, W. Ford, Roger, Andrew J.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
Models

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Subjects list: Research, Introns, Chemical evolution, Molecular evolution, Exon (Molecular genetics), Exons (Molecular genetics)
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