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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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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Epistasis Analysis01:09

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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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Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
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Evolution of New Traits in Microbes01:24

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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Video Experimental Relacionado

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Epistasis como el factor primario en la evolución molecular.

Michael S Breen1, Carsten Kemena, Peter K Vlasov

  • 1Bioinformatics and Genomics Programme, Centre for Genomic Regulation and Universitat Pompeu Fabra, 88 Dr Aiguader, Barcelona 08003, Spain.

Nature
|October 16, 2012
PubMed
Resumen

La epistasis, donde las mutaciones genéticas tienen efectos variables en diferentes antecedentes genéticos, es omnipresente en la evolución de las proteínas. La mayoría de las sustituciones de aminoácidos solo son beneficiosas en especies específicas, impactando significativamente la evolución molecular a largo plazo.

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Área de la Ciencia:

  • Evolución molecular de la evolución molecular.
  • Genética La genética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • Los principales impulsores de la evolución molecular a largo plazo no se comprenden completamente.
  • La selección positiva influye en las sustituciones de aminoácidos, pero el papel de la epistasis sigue sin estar claro.

Objetivo del estudio:

  • Para estimar cuantitativamente la prevalencia de la epistasis en la evolución de las proteínas a largo plazo.
  • Para relacionar los datos de uso de aminoácidos con las tasas evolutivas a corto plazo.

Principales métodos:

  • Análisis de alineamientos de secuencias múltiples para 16 orgánulos y proteínas codificadas por el núcleo (≥1,000 ortólogos cada una).
  • Comparación de las tasas de sustitución de aminoácidos observadas con las tasas predichas en ausencia de epistasis.

Principales resultados:

  • Un sitio proteico promedio contenía aproximadamente ocho aminoácidos diferentes.
  • Las tasas de sustitución de aminoácidos medidas son 20 veces más bajas que las tasas de evolución neutrales.
  • Aproximadamente el 90% de las sustituciones de aminoácidos dependen del contexto, siendo neutrales o beneficiosas solo en antecedentes genéticos específicos.

Conclusiones:

  • La epistasis es una fuerza penetrante en la evolución de las proteínas.
  • La mayoría de las sustituciones de aminoácidos exhiben efectos de aptitud dependientes del contexto en todas las especies.
  • La epistasis es crucial para comprender el ritmo y el modo de evolución de las proteínas a largo plazo.