Point mutation
From WikiMD's WELLNESSPEDIA
A point mutation is a single base substitution.[1] It is the smallest type of mutation possible.
In a point mutation, either:
- a single base nucleotide is changed for another nucleotide of the genetic material (normally DNA),[2] or
- a single base pair is inserted or deleted.[3]
A nonsense mutation is a point mutation in a DNA sequence that leads to an early stop codon.[4] This appears as a nonsense codon in the transcribed mRNA. Most of the time, the protein that is translated from this mRNA does not work.
References[edit]
- ↑ What is a mutation?(link). {{{website}}}. University of Texas, El Passo.
- ↑ Glossary: point mutation(link). {{{website}}}. Rosalind.
- ↑ How DNA changes affect phenotype(link). '. National Center for Biotechnology Information, U.S. National Library of Medicine.
- ↑ Eldon D Enger; Frederick C Ross; David B Bailey, Concepts in Biology, 12th Edition (London: McGraw-Hill, 2007), p. 158
