exon

noun
ex·​on | \ ˈek-ˌsän How to pronounce exon (audio) \

Definition of exon

: a polynucleotide sequence in a nucleic acid that codes information for protein synthesis and that is copied and spliced together with other such sequences to form messenger RNA — compare intron

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Other Words from exon

exonic \ ek-​ˈsä-​nik How to pronounce exon (audio) \ adjective

Examples of exon in a Sentence

Recent Examples on the Web Exondys 51 is used to treat the 13 percent of patients with disease caused by an error in the DNA sequence known as exon 51. BostonGlobe.com, "Sarepta shares rise after FDA reversal - The Boston Globe," 14 Dec. 2019 Exondys 51 is used to treat the 13% of patients with disease caused by an error in the DNA sequence known as exon 51. Damian Garde, STAT, "FDA changes course on Sarepta’s once-rejected muscular dystrophy drug," 12 Dec. 2019 Can the prime editor target a large deletion (adding back as many as five exons) and if so, can it be done that early in the sequence? Sharon Begley, STAT, "You had questions for David Liu about CRISPR, prime editing, and advice to young scientists. He has answers," 6 Nov. 2019 In one case, at Stanford, a toddler was diagnosed with two rare diseases, including a connective tissue disorder called Marfan Syndrome, after doctors conducted a form of sequencing that looks for changes in coded genetic segments known as exons. Anna Gorman, CNN, "Doctors battle 'torment' of rare undiagnosed illnesses," 8 May 2017 Named for parts of genes called introns and exons, Intrexon was founded in 1998 by Thomas D. Reed and his wife, Jackie, to supply DNA constructs for research with genetically engineered mice. Andrew Pollack, New York Times, "A Biotech Evangelist Seeks a Zika Dividend," 5 Mar. 2016

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

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First Known Use of exon

circa 1978, in the meaning defined above

History and Etymology for exon

expressed sequence + -on entry 2

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Time Traveler for exon

Time Traveler

The first known use of exon was circa 1978

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Statistics for exon

Cite this Entry

“Exon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exon. Accessed 17 Jan. 2021.

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More Definitions for exon

exon

noun
ex·​on | \ ˈek-ˌsän How to pronounce exon (audio) \

Medical Definition of exon

: a polynucleotide sequence in a nucleic acid that codes information for protein synthesis and that is copied and spliced together with other such sequences to form messenger RNA — compare intron

Other Words from exon

exonic \ ek-​ˈsän-​ik How to pronounce exon (audio) \ adjective

More from Merriam-Webster on exon

Britannica.com: Encyclopedia article about exon

Comments on exon

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