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Article

Heterochiasmy and Sexual Dimorphism: The Case of the Barn Swallow (Hirundo rustica, Hirundinidae, Aves)

1
Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
2
Department of Cytology and Genetics, Novosibirsk State University, 630090 Novosibirsk, Russia
3
SibEcoCenter LLC, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Genes 2020, 11(10), 1119; https://doi.org/10.3390/genes11101119
Received: 4 September 2020 / Revised: 18 September 2020 / Accepted: 22 September 2020 / Published: 24 September 2020
(This article belongs to the Special Issue Chromosome-Centric View of the Genome Organization and Evolution)
Heterochiasmy, a sex-based difference in recombination rate, has been detected in many species of animals and plants. Several hypotheses about evolutionary causes of heterochiasmy were proposed. However, there is a shortage of empirical data. In this paper, we compared recombination related traits in females and males of the barn swallow Hirundo rustica (Linnaeus, 1758), the species under strong sexual selection, with those in the pale martin Riparia diluta (Sharpe and Wyatt, 1893), a related and ecologically similar species with the same karyotype (2N = 78), but without obvious sexual dimorphism. Recombination traits were examined in pachytene chromosome spreads prepared from spermatocytes and oocytes. Synaptonemal complexes and mature recombination nodules were visualized with antibodies to SYCP3 and MLH1 proteins, correspondingly. Recombination rate was significantly higher (p = 0.0001) in barn swallow females (55.6 ± 6.3 recombination nodules per autosomal genome), caused by the higher number of nodules at the macrochromosomes, than in males (49.0 ± 4.5). They also showed more even distribution of recombination nodules along the macrochromosomes. At the same time, in the pale martin, sexual differences in recombination rate and distributions were rather small. We speculate that an elevated recombination rate in the female barn swallows might have evolved as a compensatory reaction to runaway sexual selection in males. View Full-Text
Keywords: heterochiasmy; sexual selection; barn swallow; sand martin; pale martin; recombination; crossing over; MLH1; SYCP3; bird genome evolution heterochiasmy; sexual selection; barn swallow; sand martin; pale martin; recombination; crossing over; MLH1; SYCP3; bird genome evolution
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MDPI and ACS Style

Malinovskaya, L.P.; Tishakova, K.; Shnaider, E.P.; Borodin, P.M.; Torgasheva, A.A. Heterochiasmy and Sexual Dimorphism: The Case of the Barn Swallow (Hirundo rustica, Hirundinidae, Aves). Genes 2020, 11, 1119. https://doi.org/10.3390/genes11101119

AMA Style

Malinovskaya LP, Tishakova K, Shnaider EP, Borodin PM, Torgasheva AA. Heterochiasmy and Sexual Dimorphism: The Case of the Barn Swallow (Hirundo rustica, Hirundinidae, Aves). Genes. 2020; 11(10):1119. https://doi.org/10.3390/genes11101119

Chicago/Turabian Style

Malinovskaya, Lyubov P., Katerina Tishakova, Elena P. Shnaider, Pavel M. Borodin, and Anna A. Torgasheva. 2020. "Heterochiasmy and Sexual Dimorphism: The Case of the Barn Swallow (Hirundo rustica, Hirundinidae, Aves)" Genes 11, no. 10: 1119. https://doi.org/10.3390/genes11101119

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