messenger RNA(redirected from Messenger Ribonucleic Acid)
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messenger RNA (mRNA) see ribonucleic acid.
ribosomal RNA (rRNA) see ribonucleic acid.
transfer RNA (tRNA) see ribonucleic acid.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
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.
Farlex Partner Medical Dictionary © Farlex 2012
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
messenger RNACommonly written as mRNA, this is the molecule that reads the genetic code from DNA. Before this can happen the double helix must separate into two single strands. One of these carries the same sequence as the mRNA and is called the coding strand. The other is called the template, or antisense, strand and it is this strand that directs the synthesis of the mRNA by complementary base pairing. In RNA the base uracil replaces thymine. The messenger RNA molecule then leaves the cell nucleus and passes out through a nuclear membrane pore to the site of protein synthesis. There the appropriate amino acids are selected and placed in the right order by TRANSFER RNA which, using its anticodons, reads the code on the messenger RNA.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
messenger RNA (mRNA)a single stranded type of POLYNUCLEOTIDE molecule that comprises a sequence of ribonucleotides with the bases ADENINE, GUANINE, CYTOSINE and URACIL. mRNA is transcribed (see TRANSCRIPTION from the DNA and contains the sequence of instructions from which a PROTEIN is translated (see TRANSLATION by the action of RIBOSOMES.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005