start codon

noun

Medical Definition of start codon

: a genetic codon in messenger RNA that stimulates the binding of a transfer RNA which starts protein synthesis … the AUG codon for methionine functions as the start codon in the vast majority of mRNAs. — Harvey Lodish et al., Molecular Cell Biology, 6th edition, 2007

called also initiation codon

— compare stop codon

Learn More about start codon

Cite this Entry

“Start codon.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/start%20codon. Accessed 29 Sep. 2020.

Comments on start codon

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

WORD OF THE DAY

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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!