SrasV1, France, Analysis, bibRecord, 000125

Embryonic expression of endogenous retroviral RNAs in somatic tissues adjacent to the Oikopleura germline.

Identifieur interne : 000125 ( France/Analysis ); précédent : 000124; suivant : 000126

Embryonic expression of endogenous retroviral RNAs in somatic tissues adjacent to the Oikopleura germline.

Auteurs : Simon Henriet [Norvège] ; Sara Sumic [Norvège] ; Carlette Doufoundou-Guilengui [Norvège] ; Marit Flo Jensen [Norvège] ; Camille Grandmougin [Norvège] ; Kateryna Fal [Norvège] ; Eric Thompson [Norvège] ; Jean-Nicolas Volff [France] ; Daniel Chourrout [Norvège]

Source :

Nucleic acids research [ 1362-4962 ] ; 2015.

RBID : pubmed:25779047

Descripteurs français

English descriptors

KwdEn :
- Amino Acid Sequence, Animals, Endogenous Retroviruses (genetics), Gene Expression Regulation, Developmental, Germ Cells, HEK293 Cells, Humans, Molecular Sequence Data, Polymorphism, Genetic, Promoter Regions, Genetic, RNA (genetics), Sequence Homology, Amino Acid, Urochordata (genetics), Viral Envelope Proteins (chemistry).
MESH :
- chemical , chemistry : Viral Envelope Proteins.
- chemical , genetics : RNA.
- genetics : Endogenous Retroviruses, Urochordata.
- Amino Acid Sequence, Animals, Gene Expression Regulation, Developmental, Germ Cells, HEK293 Cells, Humans, Molecular Sequence Data, Polymorphism, Genetic, Promoter Regions, Genetic, Sequence Homology, Amino Acid.

Abstract

Selective pressure to maintain small genome size implies control of transposable elements, and most old classes of retrotransposons are indeed absent from the very compact genome of the tunicate Oikopleura dioica. Nonetheless, two families of retrotransposons are present, including the Tor elements. The gene organization within Tor elements is similar to that of LTR retrotransposons and retroviruses. In addition to gag and pol, many Tor elements carry a third gene encoding viral envelope-like proteins (Env) that may mediate infection. We show that the Tor family contains distinct classes of elements. In some classes, env mRNA is transcribed from the 5'LTR as in retroviruses. In others, env is transcribed from an additional promoter located downstream of the 5'LTR. Tor Env proteins are membrane-associated glycoproteins which exhibit some features of viral membrane fusion proteins. Whereas some elements are expressed in the adult testis, many others are specifically expressed in embryonic somatic cells adjacent to primordial germ cells. Such embryonic expression depends on determinants present in the Tor elements and not on their surrounding genomic environment. Our study shows that unusual modes of transcription and expression close to the germline may contribute to the proliferation of Tor elements.

DOI: 10.1093/nar/gkv169
PubMed: 25779047

Affiliations:

Links to Exploration step

pubmed:25779047

Le document en format XML

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<term>Gene Expression Regulation, Developmental</term>
<term>Germ Cells</term>
<term>HEK293 Cells</term>
<term>Humans</term>
<term>Molecular Sequence Data</term>
<term>Polymorphism, Genetic</term>
<term>Promoter Regions, Genetic</term>
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<term>Régulation de l'expression des gènes au cours du développement</term>
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<front><div type="abstract" xml:lang="en">Selective pressure to maintain small genome size implies control of transposable elements, and most old classes of retrotransposons are indeed absent from the very compact genome of the tunicate Oikopleura dioica. Nonetheless, two families of retrotransposons are present, including the Tor elements. The gene organization within Tor elements is similar to that of LTR retrotransposons and retroviruses. In addition to gag and pol, many Tor elements carry a third gene encoding viral envelope-like proteins (Env) that may mediate infection. We show that the Tor family contains distinct classes of elements. In some classes, env mRNA is transcribed from the 5'LTR as in retroviruses. In others, env is transcribed from an additional promoter located downstream of the 5'LTR. Tor Env proteins are membrane-associated glycoproteins which exhibit some features of viral membrane fusion proteins. Whereas some elements are expressed in the adult testis, many others are specifically expressed in embryonic somatic cells adjacent to primordial germ cells. Such embryonic expression depends on determinants present in the Tor elements and not on their surrounding genomic environment. Our study shows that unusual modes of transcription and expression close to the germline may contribute to the proliferation of Tor elements. </div>
</front>
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Embryonic expression of endogenous retroviral RNAs in somatic tissues adjacent to the Oikopleura germline.

Embryonic expression of endogenous retroviral RNAs in somatic tissues adjacent to the Oikopleura germline.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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