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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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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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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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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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New cryptic karyotypic differences between cattle (Bos taurus) and goat (Capra hircus).

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Bioinformatics and fluorescence in situ hybridization (FISH) identified a new chromosomal inversion in goats and confirmed cattle and goat genome organization. This study refines understanding of bovine evolutionary chromosome dynamics.

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Area of Science:

  • Comparative genomics
  • Mammalian evolution
  • Cytogenetics

Background:

  • Cattle (Bos taurus) and goats (Capra hircus) share a common ancestor and similar chromosome structures.
  • Previous studies noted a translocation between cattle chromosome 9 and goat chromosome 14.
  • Understanding cryptic chromosome divergences is crucial for evolutionary studies.

Purpose of the Study:

  • To detect unknown cryptic chromosome divergences between cattle and goat genomes using bioinformatics.
  • To validate identified discrepancies using fluorescence in situ hybridization (FISH).
  • To characterize evolutionary translocations between cattle and goat chromosomes.

Main Methods:

  • Bioinformatics analysis of cattle and goat genome assemblies.
  • Fluorescence in situ hybridization (FISH) using bacterial artificial chromosome (BAC) clones.
  • Comparative genomic hybridization and sequence analysis.

Main Results:

  • A novel 7.4 Mb chromosomal inversion was identified in goat chromosome 13.
  • Bioinformatics predictions of a goat chromosome 6 transposition were not supported by FISH, indicating correct goat genome assembly.
  • The size and orientation of the translocated fragment between cattle chromosome 9 and goat chromosome 14 were precisely defined.

Conclusions:

  • Bioinformatics is an effective tool for detecting cryptic chromosomal divergences.
  • FISH successfully validated predicted genomic differences and confirmed conserved organization in other regions.
  • This research enhances the understanding of Bovidae chromosome evolution and comparative genomics.