SHAPING AND RESHAPING OF SALMONID GENOMES BY AMPLIFICATION OF TRANSFER RNA-DERIVED RETROPOSONS DURING EVOLUTION
SHAPING AND RESHAPING OF SALMONID GENOMES BY AMPLIFICATION OF TRANSFER RNA-DERIVED RETROPOSONS DURING EVOLUTION
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DOI：
10.1073/pnas.88.6.2326
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发表时间：
1991-03-01
影响因子：
11.1
通讯作者：
OKADA, N
中科院分区：
文献类型：
--
作者：
KIDO, Y;AONO, M;OKADA, N
鲑科鱼基因组中 tRNA 衍生的重复反座子的三个家族已被分离和表征。这三个家族的序列不同，但均源自 tRNA(Lys) 或结构上与 tRNA(Lys) 相关的 tRNA 物种。 鲑鱼 Sma I 家族存在于虹鳟属两个物种的基因组中，但不存在于其他物种中，包括同一属的其他五个物种。 charr Fok I 家族仅存在于红点鲑属的四个物种和亚种中。 第三个科，鲑鱼 Hpa I 科，似乎存在于所有鲑鱼物种中，但不存在于非鲑鱼科成员的物种中。 因此，原鲑鱼科的基因组最初是通过鲑鱼Hpa I家族的扩增和分散而形成的，然后分别通过最近进化的鲑鱼和红点鲑物种中Sma I和Fok I家族的扩增而重塑。 我们推测反座子的扩增和分散可能在鲑鱼物种形成中发挥了作用。
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.