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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR

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Published on: July 11, 2025

Genetic equidistance at nucleotide level.

Dejian Yuan¹, Shi Huang¹

¹State Key Laboratory of Medical Genetics, School of Life Sciences, Xiangya Medical School, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China.

|March 19, 2017

Summary

This summary is machine-generated.

The genetic equidistance phenomenon, where complex species are equidistant from simpler ones, also applies to DNA sequences. This supports the maximum genetic diversity hypothesis, suggesting species complexity drives evolutionary divergence.

Keywords:

Fast-evolving sequences Genetic equidistance phenomenon Maximum genetic diversity hypothesis Molecular clock Neutral theory Overlap sites Slow-evolving sequences

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Area of Science:

Evolutionary biology
Molecular evolution
Genomics

Background:

The genetic equidistance phenomenon describes complex taxa being equidistant in amino acid identity to simpler species.
The maximum genetic diversity (MGD) hypothesis offers a new interpretation of this phenomenon.
Previous studies focused on protein sequences, leaving the DNA level unexplored.

Purpose of the Study:

To investigate if the genetic equidistance phenomenon is observable at the coding DNA sequence (CDS) level.
To test the role of species complexity as a determinant of MGD.
To explore the relationship between DNA sequence conservation and overlap sites.

Main Methods:

Analysis of 14 proteomes and their corresponding coding DNA sequences (CDS).
Comparative sequence analysis of taxa with varying complexity.
Statistical correlation between fraction of overlap sites and CDS conservation.

Main Results:

The genetic equidistance phenomenon was confirmed at the CDS level.
Species complexity was identified as the primary determinant of MGD.
An inverse correlation was found between overlap sites and CDS conservation, suggesting saturation in less conserved DNA.

Conclusions:

The genetic equidistance phenomenon is universal, extending to DNA sequences.
The findings provide further support for the maximum genetic diversity hypothesis.
Sequence conservation influences saturation patterns in DNA evolution.