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. 1991 Mar 15;88(6):2326–2330. doi: 10.1073/pnas.88.6.2326

Shaping and reshaping of salmonid genomes by amplification of tRNA-derived retroposons during evolution.

Y Kido 1, M Aono 1, T Yamaki 1, K Matsumoto 1, S Murata 1, M Saneyoshi 1, N Okada 1
PMCID: PMC51224  PMID: 1848699

Abstract

Three families of tRNA-derived repeated retroposons in the genomes of salmonid species have been isolated and characterized. These three families differ in sequence, but all are derived from a tRNA(Lys) or from a tRNA species structurally related to tRNA(Lys). The salmon Sma I family is present in the genomes of two species of the genus Oncorhynchus but not in other species, including five other species of the same genus. The charr Fok I family is present only in four species and subspecies of the genus Salvelinus. The third family, the salmonid Hpa I family, appears to be present in all salmonid species but is not present in species that are not members of the Salmonidae. Thus, the genome of proto-Salmonidae was originally shaped by amplification and dispersion of the salmonid Hpa I family and then reshaped by amplification of the Sma I and Fok I families in the more recently evolved species of salmon and charr, respectively. We speculate that amplification and dispersion of retroposons may have played a role in salmonid speciation.

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