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Mutations are heritable (at least to daughter cells) sequence changes in DNA that can originate from replication errors, DNA damage with error-prone repair, or mobile genetic elements.
A mutation is an alteration in the nucleotide sequence of an organism’s genome (including viruses and extrachromosomal DNA). It can arise from errors during DNA replication or cell division (mitosis/meiosis), or from DNA damage that leads to error-prone repair or replication (such as translesion synthesis). Mutations may also occur through structural changes caused by mobile genetic elements, including substitutions, insertions, and deletions. Mutations may or may not produce observable changes in phenotype. Their scope includes effects in both genic and non-genic regions: mutations in genes can have no effect, change gene products, or disrupt gene function, while mutations outside genes can also contribute to genetic variation. At the cellular level, mutations can alter protein function and regulation; at the population level, the frequency of mutations changes according to their impact on survival and reproduction, thereby influencing evolution, cancer development, and immune system diversity. Overall, mutations are distinct from DNA damage: DNA damage is a physical alteration that can block transcription/replication and may be repaired using templates, whereas mutations are sequence changes that are replicated along with the cell’s DNA and are not typically “recognized” for repair once both DNA strands carry the altered base. Because mutations are the ultimate source of genetic variation, they provide the raw material on which evolutionary forces act.
Mutations are heritable (at least to daughter cells) sequence changes in DNA that can originate from replication errors, DNA damage with error-prone repair, or mobile genetic elements.
Mutations can occur in coding and noncoding regions and may range from having no detectable phenotype to causing loss or alteration of gene function.
Mutations differ from DNA damage: damage is a structural lesion that can often be repaired, while mutations are base-sequence changes that persist and are copied during replication.
A mutation is an alteration in the nucleotide sequence of a genome (or extrachromosomal DNA) that can arise from replication errors, DNA damage with error-prone repair, or mobile genetic elements.
DNA damage is a physical alteration to DNA structure (e.g., strand breaks or modified bases) that can block transcription/replication and is often repaired using templates.
A DNA repair process that can introduce sequence changes when repairing damaged DNA, thereby generating mutations.
A replication process that bypasses DNA lesions using specialized polymerases, often introducing mutations.
A mutation occurring in reproductive cells that can be transmitted to offspring and present in every cell of the descendant.
A mutation occurring in non-reproductive cells that is not inherited by offspring but is passed to all progeny cells within the same organism.
A mutation whose phenotype depends on environmental conditions, producing a wild-type-like effect under permissive conditions and a mutant phenotype under restrictive conditions.
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