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Related Concept Videos

Epistasis01:39

Epistasis

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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...
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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.
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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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Epistasis Analysis01:09

Epistasis Analysis

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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...
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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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A Ball Python Colour Morph Implicates MC1R in Melanophore-Xanthophore Distribution and Pattern Formation.

Alan Garcia-Elfring1, Heather L Roffey2, Jaren M Abergas1

  • 1Department of Biology, McGill University, Montreal, Quebec, Canada.

Pigment Cell & Melanoma Research
|November 28, 2024
PubMed
Summary
This summary is machine-generated.

Researchers identified a gene mutation in melanocortin-1 receptor (MC1R) linked to the Clown color morph in ball pythons. This finding reveals MC1R

Keywords:
MC1RMendelian phenotypeball pythonchromatophorecolour morphgenomicsmelaninpigmentationreptile

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Area of Science:

  • Genetics
  • Zoology
  • Molecular Biology

Background:

  • Reptile coloration genetics remain largely unexplored.
  • Ball pythons (Python regius) exhibit diverse color morphs, including the 'Clown' phenotype.
  • Understanding the genetic basis of these variations is crucial for evolutionary and developmental studies.

Purpose of the Study:

  • To investigate the genetic underpinnings of the Clown color morph in ball pythons.
  • To identify specific genes and mutations responsible for snake skin pigmentation and patterning.
  • To explore the functional role of identified genes in reptile coloration.

Main Methods:

  • Crowdsourcing shed skin samples from breeders and hobbyists.
  • Whole-genome pool sequencing and variant annotation.
  • Histological analyses and electron microscopy imaging.

Main Results:

  • A missense mutation in the melanocortin-1 receptor (MC1R) gene was identified and associated with the Clown phenotype.
  • This MC1R mutation appears to influence xanthophore-melanophore distribution, impacting pattern formation.
  • The study contrasts MC1R's known role in melanin production in mammals/birds with its role in pattern development in snakes.

Conclusions:

  • MC1R signaling plays a significant role in pattern formation in ball pythons, distinct from its role in melanin synthesis in other vertebrates.
  • This research highlights the diverse evolutionary functions of MC1R across vertebrate lineages.
  • Ball pythons offer a promising new model system for studying reptile coloration genetics and evolution.