Abstract
The function of introns in the evolution of genes can be explained in at least two ways: either introns appeared late in evolution and therefore could not have participated in the construction of primordial genes, or RNA splicing and introns existed in the earliest organisms but were lost during the evolution of the modern prokaryotes. The latter alternative allows the possibility of intron participation in the formation of primordial genes before the divergence of modern prokaryotes and eukaryotes1,2. Blake3 suggested that evidence for intron-facilitated evolution of a gene might be found by comparing the borders of functional protein domains with the placement of introns. We therefore examined glyceraldehyde phosphate dehydrogenase (GAPDH), a glycolytic enzyme, because it is the first protein for which the following data are available: (1) X-ray crystallographic studies demonstrating structurally independent protein ‘domains’ which were highly conserved during the divergence of prokaryotes and eukaryotes4,5; and (2) a study of genomic organization which mapped introns in the gene6. Sequencing of the chicken GAPDH gene revealed 11 introns. We report here that sites of three of the introns (IV, VI and XI) correspond closely with the borders of the NAD-binding, catalytic and helical tail domains of the enzyme, supporting the hypothesis that introns did have a role in the evolution of primitive genes. In addition, other biochemical and structural data were used to construct a model of the intron-mediated assembly of the GAPDH gene that explains the existence of 10 introns.
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Stone, E., Rothblum, K. & Schwartz, R. Intron-dependent evolution of chicken glyceraldehyde phosphate dehydrogenase gene. Nature 313, 498–500 (1985). https://doi.org/10.1038/313498a0
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DOI: https://doi.org/10.1038/313498a0
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