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Related Concept Videos

Mutations01:39

Mutations

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Overview
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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Mismatch Repair01:36

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Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
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Related Experiment Video

Updated: Dec 3, 2025

Comparative Lesions Analysis Through a Targeted Sequencing Approach
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Mutations in normal tissues-some diagnostic and clinical implications.

Clare Fiala1, Eleftherios P Diamandis2,3,4

  • 1Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, ON, Canada.

BMC Medicine
|October 29, 2020
PubMed
Summary

Mutations in normal tissues are common and offer new insights into cancer development and diagnosis. Understanding these mutations is key for early disease detection and personalized therapies.

Keywords:
Circulating tumor DNADriver mutationsMutationsNormal tissuesPassenger mutations

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Area of Science:

  • Genetics
  • Oncology
  • Pathobiology

Background:

  • Mutations are fundamental to diseases, particularly cancer.
  • Mutational analysis aids in disease diagnosis and management.
  • Cancer arises from accumulated mutations in driver genes, leading to distinct cellular characteristics.

Purpose of the Study:

  • To explore the implications of widespread mutations in normal tissues.
  • To discuss the role of normal tissue mutations in cancer pathobiology, diagnosis, and therapy.
  • To review mutations in normal tissues concerning circulating tumor DNA (ctDNA) tests, clonal hematopoiesis, and neural mosaicism.

Main Methods:

  • Review of current research on mutations in normal tissues.
  • Analysis of implications for cancer development and clonal evolution.
  • Discussion of applications in diagnostics and disease prediction.

Main Results:

  • An unexpectedly high prevalence of mutations exists in normal tissues.
  • These findings significantly impact the understanding of cancer pathobiology.
  • Mutations in normal tissues provide insights into clonal development relevant to cancer and other diseases.

Conclusions:

  • Future research must delineate differences in genetic alteration accumulation between healthy and diseased tissues.
  • Further study is needed to understand the distinct patterns of genetic changes in aging versus pathological conditions.