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Mutations01:39

Mutations

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Mutations01:35

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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.
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Agouti: A Lethal Allele
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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Complementation Tests00:49

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Spontaneous and Induced Mutations01:30

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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Residue-Specific Exchange of Proline by Proline Analogs in Fluorescent Proteins: How "Molecular Surgery" of the Backbone Affects Folding and Stability
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A mutation causing proline requirement in Zea mays.

G Gavazzi1, M Nava-Racchi, C Tonelli

  • 1Istituto di Genetica, Università di Milano, Milano, Italia.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|January 15, 2014
PubMed
Summary
This summary is machine-generated.

A new Zea mays mutant, symbolized pro, requires proline for survival. Supplementing proline in vitro rescues the seedling lethal phenotype, indicating a genetic block in proline biosynthesis.

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Area of Science:

  • Plant Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Conditional seedling lethal mutants offer insights into essential metabolic pathways in plants.
  • Identifying auxotrophic mutants in higher plants is challenging due to developmental complexities.
  • The genetic control of amino acid biosynthesis is crucial for plant growth and development.

Purpose of the Study:

  • To describe a novel monogenic recessive endosperm mutant in Zea mays.
  • To investigate the genetic basis of a conditional lethal phenotype.
  • To establish the first reported case of a strict amino acid requirement in Zea mays.

Main Methods:

  • Phenotypic characterization of a monogenic recessive mutant.
  • In vitro embryo culture on media supplemented with varying proline concentrations.
  • Analysis of genetic blocks in biosynthetic pathways.

Main Results:

  • The mutant exhibits a conditional seedling lethal phenotype.
  • In vitro culture with proline rescues the lethal phenotype, with efficiency proportional to proline concentration.
  • Normal growth is restored at 160 mg/l proline.
  • Data strongly suggest a genetic block in the proline biosynthetic pathway.

Conclusions:

  • The mutant, 'pro', possesses a genetic defect in proline biosynthesis, creating an obligate requirement for exogenous proline.
  • This represents the first documented instance of a strict amino acid auxotrophy in Zea mays.
  • The findings contribute to understanding the challenges and implications of isolating auxotrophs in higher plants.