Silent Mutation
Silent Mutation - Related Videos
11:02
Presynaptically Silent Synapses Studied with Light Microscopy
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Cited by 14 •
2010
Glutamatergic synapses can switch from an active mode to a silent mode. We demonstrate that presynaptic activity status in dissociated culture of rodent neurons is visualized using a fixable form of the FM1-43 dye to visualize active synapses and immunostaining with vGluT-1 antibody to visualize all glutamate synapses.
06:40
Measuring the Contralateral Silent Period Induced by Transcranial Magnetic Stimulation
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2025
This video demonstrates a technique for measuring the contralateral silent period (cSP) using transcranial magnetic stimulation. Position the patient's hand prone and place an electrode on the first dorsal interosseous (FDI) muscle. Then, place a force-measuring device between the thumb and index finger. Identify the primary motor cortex (M1) region of the brain. Maintain a standardized pressure on the force-measuring device and stimulate the M1 region to record the muscle activity, termed the...
00:36
Viral Mutations
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2019
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
02:27
Mutations
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2020
Mutations are changes in the sequence of DNA. These changes can occur spontaneously during DNA replication or be induced by environmental factors. Mutations can be characterized in several ways: by whether and how they alter the amino acid sequence of the protein, by the scale of the DNA affected, and by whether they affect somatic or germline cells.Consequences of Point Mutations at the Molecular LevelMutations that affect a single nucleotide are called point mutations. When point mutations...
02:27
Mutations
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2026
Mutations are changes in the sequence of DNA. These changes can occur spontaneously during DNA replication or be induced by environmental factors. Mutations can be characterized in several ways: by whether and how they alter the amino acid sequence of the protein, by the scale of the DNA affected, and by whether they affect somatic or germline cells.Consequences of Point Mutations at the Molecular LevelMutations that affect a single nucleotide are called point mutations. When point mutations...
FAQs
The genetic code contains multiple codons for the same amino acid, so a nucleotide change can alter a codon while preserving the amino acid assigned at that position. This redundancy explains why the protein’s amino acid sequence may remain unchanged even though the DNA sequence differs. It also makes these variants useful for examining subtle genetic diversity.
Preserving the amino acid does not guarantee that every step of gene expression remains unaffected. Depending on its sequence context, a silent mutation can influence mRNA splicing, mRNA stability, or translation efficiency. These effects may change how much protein is produced or how efficiently it is made, giving the variant consequences beyond its direct codon-to-amino-acid relationship.
The term describes the absence of an amino acid change, not the absence of every possible molecular effect. A variant may look neutral when protein sequence is considered alone yet still influence mRNA behavior or protein production. Therefore, interpreting its significance requires attention to gene expression and translation, rather than relying only on the amino acid outcome.
Interpretation begins by recognizing that a DNA sequence change may leave the encoded amino acid unchanged. That apparent result should then be considered alongside possible effects on mRNA splicing, stability, and translation efficiency. This approach helps distinguish variants that are likely subtle from those that may influence gene expression or protein production, improving analysis of sequencing results.
Because they preserve the assigned amino acid while changing DNA sequence, silent mutations provide examples of genetic variation that may not produce an immediately visible protein-sequence difference. Researchers can examine such variants when investigating patterns of genetic diversity and evolution. Their subtle nature helps show how sequence-level change can accumulate without an obvious alteration in protein composition.
Medical genetics cannot assume that an unchanged amino acid means a variant has no relevance. Some apparently neutral changes may affect mRNA splicing, stability, translation efficiency, gene expression, or protein production. Careful interpretation is therefore important when evaluating genome-sequencing findings, because a silent mutation may have consequences that are not evident from the protein sequence alone.