miRNA

noun
\ ˌem-ˌī-ˌär-(ˌ)en-ˈā How to pronounce miRNA (audio) \

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.

Examples of miRNA in a Sentence

Recent Examples on the Web In 2017, Lönnerdal and his colleagues explored this question by exposing miRNA-containing exosomes from breast milk to acidic conditions that mimic those in the infant gut and observing how the packages fared2. Tien Nguyen, Scientific American, 17 June 2020 So a single miRNA might match 20–50 mRNAs, Hicks says. Tien Nguyen, Scientific American, 17 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'miRNA.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of miRNA

2001, in the meaning defined above

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Dictionary Entries Near miRNA

mirliton

miRNA

Miró

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Statistics for miRNA

Last Updated

10 Dec 2021

Cite this Entry

“MiRNA.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/miRNA. Accessed 19 Jan. 2022.

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More Definitions for miRNA

miRNA

noun
\ ˌem-ˌī-ˌär-ˌen-ˈā How to pronounce miRNA (audio) \

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., Science, 21 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 Medicine, 18 Dec. 2008

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