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It is similar to DNA but with the replacement of thymine by uracil and the adding of one oxygen atom. [1] Despite the structural similarities, much less is known about dsRNA. [2] They form the genetic material of some viruses (double-stranded RNA viruses). dsRNA, such as viral RNA or siRNA, can trigger RNA interference in eukaryotes, as well as ...
Nucleic acid variants normally associated with viruses, such as double-stranded RNA , are recognized by TLR3 and unmethylated CpG motifs are recognized by TLR9. [9] The CpG motifs must be internalized in order to be recognized by TLR9. [ 8 ]
Unlike double-stranded DNA, RNA is usually a single-stranded molecule (ssRNA) [4] in many of its biological roles and consists of much shorter chains of nucleotides. [5] However, double-stranded RNA (dsRNA) can form and (moreover) a single RNA molecule can, by complementary base pairing, form intrastrand double helixes, as in tRNA .
An individual strand of DNA is referred to as positive-sense (also positive (+) or simply sense) if its nucleotide sequence corresponds directly to the sequence of an RNA transcript which is translated or translatable into a sequence of amino acids (provided that any thymine bases in the DNA sequence are replaced with uracil bases in the RNA ...
The double-stranded genome is used as a template by the viral RNA-dependent RNA polymerase (RdRp) to transcribe a positive-strand RNA functioning as messenger RNA (mRNA) for the host cell's ribosomes, which translate it into viral proteins. The positive-strand RNA can also be replicated by the RdRp to create a new double-stranded viral genome. [1]
Other segments of DNA are transcribed into RNA molecules called non-coding RNAs (ncRNAs). Both DNA and RNA are nucleic acids, which use base pairs of nucleotides as a complementary language. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript.
Only one strand of DNA, called the template strand (also called the noncoding strand or nonsense/antisense strand), gets transcribed. [2] Transcription begins and short "abortive" nucleotide sequences approximately 10 base pairs long are produced. These short sequences are nonfunctional pieces of RNA that are produced and then released. [1]
Viruses containing positive-strand RNA or double-strand RNA, except retroviruses and Birnaviridae. All positive-strand RNA eukaryotic viruses with no DNA stage, such as Coronaviridae; All RNA-containing bacteriophages; the two families of RNA-containing bacteriophages are Fiersviridae (positive ssRNA phages) and Cystoviridae (dsRNA phages)