New insights about the regulation of Nidovirus subgenomic mRNA synthesis.

New insights about the regulation of Nidovirus subgenomic mRNA synthesis.
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DOI:
10.1016/j.virol.2018.01.026
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发表时间:
2018-04
期刊:
影响因子:
3.7
通讯作者:
Brinton MA
Brinton MA
中科院分区:
医学3区
文献类型:
--
作者:
Di H;McIntyre AA;Brinton MA

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The members of the Order Nidovirales share a similar genome organization with two overlapping nonstructural polyproteins encoded in the 5′ two-thirds and the structural proteins encoded in the 3′ third. They also express their 3′ region proteins from a nested set of 3′ co-terminal subgenomic messenger RNAs (sg mRNAs). Some but not all of the Nidovirus sg mRNAs also have a common 5′ leader sequence that is acquired by a discontinuous RNA synthesis mechanism regulated by multiple 3′ body transcription regulating sequences (TRSs) and the 5′ leader TRS. Initial studies detected a single major body TRS for each 3′ sg mRNA with a few alternative functional TRSs reported. The recent application of advanced techniques, such as next generation sequencing and ribosomal profiling, in studies of arteriviruses and coronaviruses has revealed an expanded sg mRNA transcriptome and coding capacity. Nidoviruses express some of their genes from a nested set of 3′ co-terminal sg mRNAs. The sg mRNAs of some but not all Nidoviruses have a common 5′ leader sequence. Transcription regulating sequences in the genome are sites of premature minus stand termination. Multiple alternative transcriptional regulating sequences were identified for some 3′ORFs. Next generation sequencing and ribosomal profiling identified additional coding capacity.
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