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Article

Chromosomal Analysis in Crotophaga ani (Aves, Cuculiformes) Reveals Extensive Genomic Reorganization and an Unusual Z-Autosome Robertsonian Translocation

1
School of Biosciences, University of Kent, Canterbury CT2 7NJ, UK
2
Laboratório de Citogenética e Evolução, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre 91509-900, Rio Grande do Sul, Brazil
3
Laboratório de Diversidade Genética Animal, Universidade Federal do Pampa, São Gabriel 97300-162, Rio Grande do Sul, Brazil
4
Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, São Carlos 13565-905, São Paulo, Brazil
5
Laboratório de Cultura de Tecidos e Citogenética, SAMAM, Instituto Evandro Chagas, Ananindeua 67030-000, Pará, Brazil
6
Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém 66075-110, Pará, Brazil
*
Author to whom correspondence should be addressed.
Received: 25 November 2020 / Revised: 11 December 2020 / Accepted: 18 December 2020 / Published: 22 December 2020
(This article belongs to the Collection Non-human Chromosome Analysis)
Although cytogenetics studies in cuckoos (Aves, Cuculiformes) have demonstrated an interesting karyotype variation, such as variations in the chromosome morphology and diploid number, their chromosome organization and evolution, and relation with other birds are poorly understood. Hence, we combined conventional and molecular cytogenetic approaches to investigate chromosome homologies between chicken and the smooth-billed ani (Crotophaga ani). Our results demonstrate extensive chromosome reorganization in C. ani, with interchromosomal rearrangements involving macro and microchromosomes. Intrachromosomal rearrangements were observed in some macrochromosomes, including the Z chromosome. The most evolutionary notable finding was a Robertsonian translocation between the microchromosome 17 and the Z chromosome, a rare event in birds. Additionally, the simple short repeats (SSRs) tested here were preferentially accumulated in the microchromosomes and in the Z and W chromosomes, showing no relationship with the constitutive heterochromatin regions, except in the W chromosome. Taken together, our results suggest that the avian sex chromosome is more complex than previously postulated and revealed the role of microchromosomes in the avian sex chromosome evolution, especially cuckoos. View Full-Text
Keywords: birds; genome evolution; sex chromosomes; chromosomal rearrangements birds; genome evolution; sex chromosomes; chromosomal rearrangements
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MDPI and ACS Style

Kretschmer, R.; Gunski, R.J.; Garnero, A.d.V.; de Freitas, T.R.O.; Toma, G.A.; Cioffi, M.d.B.; Oliveira, E.H.C.d.; O’Connor, R.E.; Griffin, D.K. Chromosomal Analysis in Crotophaga ani (Aves, Cuculiformes) Reveals Extensive Genomic Reorganization and an Unusual Z-Autosome Robertsonian Translocation. Cells 2021, 10, 4. https://doi.org/10.3390/cells10010004

AMA Style

Kretschmer R, Gunski RJ, Garnero AdV, de Freitas TRO, Toma GA, Cioffi MdB, Oliveira EHCd, O’Connor RE, Griffin DK. Chromosomal Analysis in Crotophaga ani (Aves, Cuculiformes) Reveals Extensive Genomic Reorganization and an Unusual Z-Autosome Robertsonian Translocation. Cells. 2021; 10(1):4. https://doi.org/10.3390/cells10010004

Chicago/Turabian Style

Kretschmer, Rafael, Ricardo José Gunski, Analía del Valle Garnero, Thales Renato Ochotorena de Freitas, Gustavo Akira Toma, Marcelo de Bello Cioffi, Edivaldo Herculano Corrêa de Oliveira, Rebecca E. O’Connor, and Darren K. Griffin. 2021. "Chromosomal Analysis in Crotophaga ani (Aves, Cuculiformes) Reveals Extensive Genomic Reorganization and an Unusual Z-Autosome Robertsonian Translocation" Cells 10, no. 1: 4. https://doi.org/10.3390/cells10010004

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