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Related Concept Videos

Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Pleiotropy01:33

Pleiotropy

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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Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish
07:16

Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish

Published on: March 1, 2022

Vertebrate pigmentation: from underlying genes to adaptive function.

Joanna K Hubbard1, J Albert C Uy, Mark E Hauber

  • 1Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA. Joanna.Hubbard@colorado.edu

Trends in Genetics : TIG
|April 13, 2010
PubMed
Summary
This summary is machine-generated.

Animal coloration genetics reveals conserved pigment gene functions across vertebrates. Studying these genes in wild populations helps understand how selection drives adaptive coloration and phenotypic diversity.

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Area of Science:

  • Genetics and Evolutionary Biology
  • Animal Pigmentation and Phenotype

Background:

  • Animal coloration serves as a key model for investigating the genetic basis of phenotypic traits.
  • Laboratory mouse studies have elucidated inheritance patterns and pleiotropic effects of pigmentation genes.
  • Research now extends to wild populations, confirming conserved pigment gene function across vertebrates and its role in adaptive coloration.

Purpose of the Study:

  • To explore how natural selection influences both genetic and phenotypic variation in animal coloration.
  • To leverage insights from pigmentation genetics to understand the evolutionary generation of phenotypic diversity.

Main Methods:

  • Utilizing genetic crosses in laboratory mice to map pigmentation loci.
  • Analyzing pigmentation genes and their functions in diverse wild vertebrate populations.
  • Integrating genetic approaches with studies on color perception.

Main Results:

  • Pigment gene function is largely conserved across different vertebrate species.
  • Conserved pigment genes significantly influence adaptive coloration in predictable ways.
  • Genetic and phenotypic variation in coloration are shaped by selection pressures.

Conclusions:

  • Understanding conserved pigment gene function is crucial for evolutionary studies.
  • Selection on pigmentation genes drives adaptive coloration and contributes to phenotypic diversity.
  • Integrative studies of genetics, coloration, and perception offer new avenues for evolutionary research.