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Evidencia de que los eucariotas y los procariotas eocitos son parientes inmediatos.

M C Rivera1, J A Lake

  • 1Molecular Biology Institute, University of California, Los Angeles 90024.

Science (New York, N.Y.)
|July 3, 1992
PubMed
Resumen

El origen de los eucariotas sigue sin estar claro debido a la divergencia genética. La comparación de los genes alfa del factor de alargamiento EF-1 reveló un segmento único de 11 aminoácidos en eucariotas y eocitos, lo que sugiere que los eocitos son los parientes bacterianos más cercanos a los eucariotas.

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Área de la Ciencia:

  • Biología molecular La biología molecular.
  • Biología evolutiva Biología evolutiva.
  • La genómica es la genómica.

Sus antecedentes:

  • La historia evolutiva y el origen filogenético de los eucariotas son difíciles de determinar.
  • Los genes nucleares eucariotas han sufrido divergencias significativas de los genes procariotas, lo que complica los análisis evolutivos.

Objetivo del estudio:

  • Investigar la relación filogenética entre eucariotas y procariotas.
  • Identificar marcadores moleculares que puedan arrojar luz sobre el origen de los eucariotas.

Principales métodos:

  • Análisis comparativo de secuencias de genes alfa del factor de alargamiento EF-1 en diversos organismos.
  • Identificación y comparación de segmentos específicos de la secuencia de aminoácidos, incluyendo un inserto de 11 aminoácidos.

Principales resultados:

  • Se identificó un segmento único de 11 aminoácidos en las secuencias alfa EF-1 de los eucariotas.
  • Este segmento de 11 aminoácidos también estaba presente en los eocitos (bacterias extremadamente termófilas que metabolizan azufre).
  • La inserción estaba ausente en todos los otros linajes bacterianos y en genes parálogos relacionados (EF-2, IF-2).

Conclusiones:

  • La presencia de la inserción compartida de 11 aminoácidos sugiere fuertemente una estrecha relación evolutiva.
  • Los eocitos representan los parientes sobrevivientes más cercanos (taxón hermano) de los eucariotas basados en los datos de la secuencia de genes alfa EF-1.