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Related Concept Videos

Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Related Experiment Video

Updated: Aug 29, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
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Modifier genes and Lynch syndrome: some considerations.

Rodney J Scott1

  • 1Discipline of Medical Genetics, School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW, 2308, Australia. rodney.scott@newcastle.edu.au.

Hereditary Cancer in Clinical Practice
|September 10, 2022
PubMed
Summary
This summary is machine-generated.

Lynch Syndrome (LS) presents variably due to genetic and environmental factors. Modifier genes influence LS cancer risk, and their effects are gene-specific, explaining varied study outcomes.

Keywords:
IncidenceLynch syndromeMLH1MSH2Modifier genesSurvival

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Area of Science:

  • Genetics
  • Oncology
  • Cancer Epidemiology

Background:

  • Lynch Syndrome (LS) exhibits high clinical variability, with cancer development influenced by genetic predisposition and environmental factors.
  • Colorectal cancer is the most common malignancy in LS patients.
  • Environmental factors like smoking and alcohol consumption interact with genetic predisposition to affect cancer risk.

Purpose of the Study:

  • To review the current understanding of modifier gene detection in individuals with LS.
  • To present evidence suggesting gene-specific effects of modifier genes in LS.

Main Methods:

  • Literature review of genetic and environmental factors in Lynch Syndrome.
  • Analysis of data supporting gene-specific modifier gene effects.

Main Results:

  • Modifier genes significantly influence cancer risk in individuals with LS.
  • The impact of modifier genes is specific to the particular gene being studied.
  • Gene-specific effects explain inconsistencies in previous modifier gene association studies.

Conclusions:

  • Understanding modifier genes is crucial for predicting LS cancer risk.
  • Future research should consider the gene-specific nature of modifier effects in LS.