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Related Concept Videos

Principles of Pharmacogenetics: Types of Genetic Variants01:27

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The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Design and Use of a Low Cost, Automated Morbidostat for Adaptive Evolution of Bacteria Under Antibiotic Drug Selection
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Dosage-sensitive genes in evolution and disease.

Alan M Rice1, Aoife McLysaght2

  • 1Smurfit Institute of Genetics, Trinity College Dublin, University of Dublin, Dublin 2, Ireland.

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Summary
This summary is machine-generated.

Gene dosage changes, like duplications or deletions, impact phenotypes and are linked to diseases. Evolutionary constraints can identify these dosage-sensitive genes, with expression levels potentially explaining their pathogenicity.

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Genomic Medicine

Background:

  • A subset of genes exhibit dosage sensitivity, where changes in copy number (duplication or deletion) lead to phenotypic effects.
  • Dosage-sensitive genes are implicated in various diseases, including cardiovascular conditions, cancers, and neuropsychiatric disorders.
  • The precise mechanisms underlying the pathogenicity of copy number variations are often unclear.

Purpose of the Study:

  • To explore the evolutionary constraints associated with gene copy number sensitivity as a diagnostic tool.
  • To investigate the role of gene expression levels in the pathogenic effects of copy number variants.
  • To establish a common mechanistic basis for the pathogenicity of copy number variations.

Main Methods:

  • Analysis of evolutionary constraints to identify dosage-sensitive genes.
  • Comparative genomics to detect characteristic patterns related to gene dosage.
  • Correlation studies between gene copy number, gene expression levels, and disease association.

Main Results:

  • Gene copy number sensitivity imposes specific evolutionary constraints, aiding in the identification of dosage-sensitive genes.
  • A strong association exists between copy number changes in certain genes and the development of complex diseases.
  • Gene expression levels are proposed as a unifying factor in the pathogenicity of many copy number variants.

Conclusions:

  • Dosage-sensitive genes are critical for normal cellular function and their alterations contribute to disease.
  • Evolutionary analysis provides a valuable method for discovering genes sensitive to copy number changes.
  • Gene expression modulation offers a potential common pathway explaining how copy number variations lead to disease phenotypes.