日本和美國(guó)科學(xué)家最近發(fā)現(xiàn),,人類基因組的8%是來自與病毒,。這項(xiàng)研究是由Cédric Feschotte完成的,,發(fā)表在Nature雜志上,。該研究表明,,人類和其他哺乳動(dòng)物的一部分DNA最早來自于一種RNA病毒——博爾納病毒(bornaviruses)。據(jù)Feschotte介紹,,這種來源于病毒的DNA可能是引起基因突變的原因之一,,也可能導(dǎo)致如精神分裂癥之類的精神疾病。
病毒序列同化到宿主細(xì)胞基因組中的過程稱為內(nèi)生化(endogenization),。當(dāng)這種病毒的DNA整合到生殖細(xì)胞的染色體,,將會(huì)隨生殖細(xì)胞傳遞到子代個(gè)體中。到目前為止,逆轉(zhuǎn)錄病毒是唯一已知可在脊椎動(dòng)物中內(nèi)生化的病毒,。但據(jù)最新的這項(xiàng)研究發(fā)現(xiàn),,非逆轉(zhuǎn)錄病毒博爾納病毒也可在進(jìn)化過程中內(nèi)生化到哺乳動(dòng)物基因組中。
博爾納病毒(BDV)可感染禽類和哺乳動(dòng)物,。這種病毒只侵染宿主的神經(jīng)元細(xì)胞核,。據(jù)Feschotte稱,這是研究人員首次將BDV與細(xì)胞核建立聯(lián)系,。研究人員對(duì)234種真核生物的基因組序列進(jìn)行搜索,,以尋找與BDV基因組相似的部分。結(jié)果發(fā)現(xiàn)在多種哺乳動(dòng)物基因組中存在大量的博爾納病毒類似的基因組,。 (生物谷Bioon.com)
生物谷推薦原始出處:
Nature 463, 39-40 (7 January 2010) | doi:10.1038/463039a
Virology: Bornavirus enters the genome
Cédric Feschotte1
A survey of mammalian genomes has unexpectedly unearthed DNA derived from bornaviruses, leading to speculation about the role of these viruses in causing mutations with evolutionary and medical consequences.
Some people might find it disquieting that a hefty 8% of human genetic material originates not from our vertebrate ancestors but from viruses. The assimilation of viral sequences into the host genome is a process referred to as endogenization.
Cédric Feschotte is in the Department of Biology, University of Texas, Arlington, Texas 76016, USA.