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Lethal Alleles02:41

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Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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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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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing
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Digest: Few new mutations are recessive lethal.

Benjamin R Epley1

  • 1Ecology and Evolution, University of Chicago, Chicago, IL, United States.

Evolution; International Journal of Organic Evolution
|June 24, 2023
PubMed
Summary
This summary is machine-generated.

Fewer than 1% of new mutations are recessive lethal in humans and fruit flies. Current methods struggle to accurately estimate the proportion of these lethal mutations, impacting genetic studies.

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Population Genetics

Background:

  • Understanding the impact of new mutations is crucial for evolutionary and genetic studies.
  • Recessive lethal mutations can significantly influence population genetics but are challenging to detect.

Purpose of the Study:

  • To determine the frequency of recessive lethal mutations in humans and Drosophila melanogaster.
  • To evaluate the accuracy of site frequency spectrum (SFS) methods in estimating recessive lethal mutations.

Main Methods:

  • Analysis of nonsynonymous mutations in human and Drosophila melanogaster populations.
  • Comparison of mutation data with site frequency spectrum (SFS) analyses.

Main Results:

  • Less than 1% of nonsynonymous mutations were identified as recessive lethal.
  • Standard SFS-based methods inaccurately estimate the fraction of recessive lethal mutations, despite their robustness for nonlethal fitness effects.

Conclusions:

  • Recessive lethality is a rare but significant factor in mutation dynamics.
  • Novel methods are needed to accurately quantify recessive lethal mutations for robust population genetic inferences.