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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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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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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Related Experiment Video

Updated: Nov 15, 2025

Generation and Maintenance of Primate Induced Pluripotent Stem Cells Derived from Urine
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Recent genetic connectivity and clinal variation in chimpanzees.

Jack D Lester1, Linda Vigilant2, Paolo Gratton2

  • 1Max Planck Institute for Evolutionary Anthropology (MPI EVAN), Leipzig, Germany. jack_lester@eva.mpg.de.

Communications Biology
|March 6, 2021
PubMed
Summary

Chimpanzee genetic connectivity is primarily shaped by distance, not subspecies boundaries, indicating recent gene flow across historical barriers. However, human impact threatens future genetic diversity.

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Area of Science:

  • Primate genetics
  • Conservation biology
  • Evolutionary biology

Background:

  • Chimpanzees (Pan troglodytes) display significant behavioral variation across diverse habitats.
  • Four recognized subspecies are separated by historical geographic barriers, but range-wide genetic connectivity is poorly understood.
  • Previous studies faced limitations due to restricted sampling.

Purpose of the Study:

  • To resolve the range-wide genetic connectivity of chimpanzees.
  • To investigate the influence of geographic distance and recognized subspecies boundaries on genetic structure.
  • To assess the impact of recent anthropogenic pressures on chimpanzee genetic diversity.

Main Methods:

  • Analysis of a geographically comprehensive chimpanzee sample set.
  • Use of microsatellite markers to infer recent population history.
  • Application of population genetics methods to assess genetic structure and connectivity.

Main Results:

  • Isolation by distance is the primary driver of chimpanzee genetic structure across their range.
  • No significant spatial genetic discontinuities were found corresponding to recognized subspecies.
  • Evidence suggests historical subspecies-delineating barriers were permeable to gene flow.
  • Strong local genetic differentiation was observed in areas affected by recent anthropogenic pressures.

Conclusions:

  • Chimpanzee genetic structure is largely explained by geographic distance, challenging traditional subspecies definitions.
  • Behavioral flexibility likely facilitates chimpanzee adaptation to environmental changes.
  • Ongoing habitat fragmentation and isolation due to human activities pose a significant threat to chimpanzee genetic diversity.