messenger RNA(redirected from Rna, messenger)
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Related to Rna, messenger: ribosomal RNA
messenger RNA (mRNA) see ribonucleic acid.
ribosomal RNA (rRNA) see ribonucleic acid.
transfer RNA (tRNA) see ribonucleic acid.
mes·sen·ger RNA (mRNA),(mes'en-jĕr),
the RNA reflecting the exact nucleoside sequence of the genetically active DNA and carrying the "message" of the latter, coded in its sequence, to the cytoplasmic areas where protein is made in amino acid sequences specified by the mRNA, and hence primarily by the DNA; viral RNAs are considered to be natural messenger RNAs.
n. Abbr. mRNA
The form of RNA that mediates the transfer of genetic information from the cell nucleus to ribosomes in the cytoplasm, where it serves as a template for protein synthesis. It is synthesized from a DNA template during the process of transcription.
messenger RNA (mRNA)
Etymology: ME, messangere, message bearer; RNA, ribonucleic acid
(in molecular genetics) an RNA fraction that carries information from deoxyribonucleic acid to the protein-synthesizing ribosomes of cells. mRNA contains codons that are eventually encoded into amino acids via the translation process.
messenger RNAAn RNA (ribonucleic acid) molecule which has coding regions and translation signals derived from a gene, carries the reverse template message from DNA, and is required for protein synthesis. mRNA is a nucleic acid intermediate that specifies the amino acid sequence of a polypeptide during translation. Under most circumstances, and in accordance with the so-called central dogma of biology, the message flows from DNA to RNA, which is then translated into protein. DNA is wrapped around proteins (histones in chromatin); the DNA then unwinds, allowing transcription by one of the three RNA polymerases, forming a primary (nuclear) RNA transcript that is then processed to remove the intervening RNA sequences (introns), yielding a mature mRNA molecule. The mature mRNA then passes through nuclear pores into the cytoplasm, where translation into proteins occurs. When a particular mRNA is no longer needed, it is degraded by ribonucleases.
mes·sen·ger RNA(mRNA) (mes'ĕn-jĕr)
The RNA reflecting the exact nucleoside sequence of the genetically active DNA and carrying the "message" of the latter, coded in its sequence, to the cytoplasmic areas where protein is made in amino acid sequences specified by the mRNA, and hence primarily by the DNA; viral RNA is considered to be natural messenger RNA.