miRNA

noun \ ˌem-ˌī-ˌär-(ˌ)en-ˈā \

Definition of miRNA

genetics
:microrna
  • A major part of this regulation is performed by microRNAs (miRNAs), small RNA molecules encoded by the genome that are not translated into proteins; rather, they control the expression of genes.
  • —Sebastien S. Hebert et al.

First Known Use of mirna

2001


Medical Dictionary

miRNA

noun \ ˌem-ˌī-ˌär-ˌen-ˈā \

medical Definition of miRNA

:microrna
  • MicroRNAs (miRNAs) are 20- to 22-nucleotide RNAs that regulate the function of eukaryotic messenger RNAs (mRNAs) and play important roles in development, cancer, stress responses, and viral infections.
  • —J. Ross Buchan et al.Science21 Dec. 2007
  • Many of the noncoding RNAs, epitomized by the miRNA, have regulatory functions in normal cells. The aberrant expression of miRNA promotes tumorigenesis, metastasis, and other features of cancer.
  • —Frank J. Slack et al.The New England Journal of Medicine18 Dec. 2008

Seen and Heard

What made you want to look up miRNA? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to praise usually to excess

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!