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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

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A comparative study on karyotypic diversification rate in mammals.

P A Martinez¹, U P Jacobina², R V Fernandes³

¹PIBi Lab-Laboratorio de Pesquisas Integrativas em Biodiversidade, Pós-Graduação em Ecologia e Conservação, Universidade Federal de Sergipe, São Cristovão, Brazil.

|November 3, 2016

Summary

Mammalian karyotypic diversity is driven by reproductive traits like litter size and longevity, which increase chromosomal change probability. Geographic distribution also influences the fixation of major chromosomal changes, impacting evolution.

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Area of Science:

Evolutionary Biology
Genetics
Mammalogy

Background:

Chromosomal rearrangements are key drivers of organismic evolution.
Mechanisms governing varying chromosomal rearrangement rates across phylogenetic clades remain poorly understood.
Mammals exhibit significant karyotypic diversity, necessitating investigation into its underlying causes.

Purpose of the Study:

To investigate the factors contributing to the extensive karyotypic diversity observed in mammals.
To analyze the influence of metabolic, reproductive, biogeographic, and genomic characteristics on karyotypic diversification rates (rKD).

Main Methods:

Employed comparative phylogenetic methods to analyze macro- and microstructural karyotypic diversification rates (rKD).
Examined correlations between reproductive traits (litter size, longevity), biogeographic factors (geographic distribution), and genomic characteristics with rKD.

Main Results:

Reproductive characteristics, specifically larger annual litter sizes and increased longevity, were found to correlate with a higher probability of chromosomal change due to increased meiosis.
Species within families possessing broad geographic distributions but with restricted ranges showed a greater likelihood of macrostructural chromosomal change fixation across different areas.
Karyotypic diversification rates (rKD) do not follow Brownian motion; mutation rates are linked to the evolution of repetitive sequences.

Conclusions:

Mammalian karyotypic diversity is shaped by both historical and adaptive processes.
Reproductive and genomic factors play crucial roles in modulating the rate of chromosomal change.
Natural selection, genetic drift, and meiotic drive are decisive in the fixation of chromosomal rearrangements.