Horizontal transfers of Mariner transposons between mammals and insects.
Horizontal transfers of Mariner transposons between mammals and insects.
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DOI：
10.1186/1759-8753-3-14
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发表时间：
2012-09-26
期刊：
影响因子：
4.9
通讯作者：
Jurka J
中科院分区：
文献类型：
--
作者：
Oliveira SG;Bao W;Martins C;Jurka J
活性转座因子（Active transposable elements，TE）可以通过水平转移（horizontal transfer，HT）在不同物种的基因组间传递。这可能有助于它们避免由于自然选择或沉默而导致的垂直灭绝。HT在真核生物类群中相对常见，但在远缘种之间罕见。密切相关的水手型DNA转座子家族，统称为水手-1_Tbel家族，存在于两种蚂蚁和两种哺乳动物的基因组中。四个家族的共有序列显示出大于95%的成对同一性。此外，哺乳动物Mariner1_BT家族与一些昆虫Mariner家族的进化关系密切。哺乳动物水手1_BT型序列仅存在于三个组的物种中，包括反刍动物，齿鲸（Odontoceti）和新世界叶鼻蝠（Phyllostomidae）。水平转移解释了哺乳动物中Mariner_Tbel和Mariner 1_BT家族的存在。Mariner_Tbel家族大约在1亿至6900万年前（MYA）被引入刺猬和树鼩基因组。最有可能的是，这些TE家族从昆虫转移到哺乳动物，但转移的细节仍然未知。
Active transposable elements (TEs) can be passed between genomes of different species by horizontal transfer (HT). This may help them to avoid vertical extinction due to elimination by natural selection or silencing. HT is relatively frequent within eukaryotic taxa, but rare between distant species. Closely related Mariner-type DNA transposon families, collectively named as Mariner-1_Tbel families, are present in the genomes of two ants and two mammalian genomes. Consensus sequences of the four families show pairwise identities greater than 95%. In addition, mammalian Mariner1_BT family shows a close evolutionary relationship with some insect Mariner families. Mammalian Mariner1_BT type sequences are present only in species from three groups including ruminants, tooth whales (Odontoceti), and New World leaf-nosed bats (Phyllostomidae). Horizontal transfer accounts for the presence of Mariner_Tbel and Mariner1_BT families in mammals. Mariner_Tbel family was introduced into hedgehog and tree shrew genomes approximately 100 to 69 million years ago (MYA). Most likely, these TE families were transferred from insects to mammals, but details of the transfer remain unknown.
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