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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Computational Biology

Background:

  • Information in biology is encoded in nucleotide strings.
  • Understanding the origin of these information-bearing sequences is crucial.
  • This study investigates the feasibility of establishing specific nucleotide strings via evolutionary processes.

Purpose of the Study:

  • To determine the realistic timeframe for establishing specific nucleotide strings through mutation and selection.
  • To assess the impact of various evolutionary parameters on the waiting time for sequence fixation.

Main Methods:

  • Comprehensive numerical simulations using a modified Mendel's Accountant program.
  • Simulated a pre-human hominin population with specified size, generation time, and selection intensity.
  • Tested effects of mutation rate, string length, fitness benefit, and population size on waiting time to fixation.

Main Results:

  • Establishing even short nucleotide strings (2-5 nucleotides) required extremely long waiting times (84 million to 2 billion years).
  • Higher mutation rates, stronger fitness benefits, and larger populations reduced waiting times.
  • Prohibitive waiting times were observed even with generous parameter settings.

Conclusions:

  • The waiting time for establishing specific nucleotide strings is a significant constraint on macroevolution in hominin populations.
  • The routine establishment of beneficial nucleotide strings of two or more nucleotides is highly problematic.