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Two new karyotypes in the Peruvian owl monkey (Aotus trivirgatus)
Nancy Shui-Fong Ma1, Rolando Aquino2, William E Collins3
1New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts.
American Journal of Primatology
|January 26, 2020
Summary
Owl monkeys (Aotus) exhibit significant chromosomal variation. Studies reveal a single fusion or fission event explains chromosome number differences in Peruvian owl monkey populations.
Area of Science:
- Genetics
- Evolutionary Biology
- Cytogenetics
Background:
- Owl monkeys (Aotus trivirgatus) display notable karyotypic variation.
- Previous research indicated chromosomal diversity within this New World genus.
Purpose of the Study:
- To investigate the chromosomal evolution in the owl monkey genus (Aotus).
- To analyze the chromosome complement of a specific "phenotype-B" Aotus population from Peru.
Main Methods:
- Karyotypic analysis of owl monkey populations.
- G-band comparison of identified karyotypes.
Main Results:
- Identified three karyotypes in the Peruvian "phenotype-B" Aotus population: V (2n=46), and two new karyotypes (2n=47, 2n=48).
- Chromosome number polymorphism is attributed to a single fusion or fission event involving specific chromosome types.
- This mechanism is consistent with findings in "phenotype-B" Aotus populations from Colombia and Panama.
Conclusions:
- A single fusion or fission event is a key driver of karyotypic variation in Aotus.
- This mechanism explains chromosome number polymorphism across different "phenotype-B" Aotus populations.
- Chromosomal evolution in Aotus is characterized by specific, recurring rearrangement events.
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