This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or relating to a mutation that changes a codon for one amino acid into a codon for a different amino acid.

n. A damaged DNA sequence that is meaningful but has an incorrect meaning, with the result that its products do not do what they are supposed to do.

To give a wrong sense or meaning to.

"Genetic diseases are often caused by a specific type of genetic alteration called a missense mutation that makes cells add an incorrect amino acid into the protein chain."

nonsense   

frameshift    lpr    cosmic-ray    loss-of-function    cancer-causing