Variación del estadio embrionario de Basiliscus vittatus (Squamata: Corytophanidae) en la oviposición

Suárez-Varón, Gabriel; Cortez, Diego; Cruz, Maricela Villagrán–Santa; Rojas-Hernández, Ulises; Hernández-Gallegos, Oswaldo

doi:10.22201/ib.20078706e.2021.92.3795

Cited by 2 publications

(1 citation statement)

References 38 publications

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“…Forty-two eggs (32%) became contaminated with fungal infection and the embryos died with no correlation with the incubation temperature ( X 2 test, P > 0.05). Of the 88 eggs that successfully reached the target developmental stages, 40 were used in a parallel study that aimed to establish the effect of incubation temperatures on the development of the embryos [ 27 ]. Finally, forty-eight eggs (12, 18, 18 for 26°C, 29°C, and 32°C, respectively) reached the target stages 35–37.…”

Section: Methodsmentioning

confidence: 99%

Genetic determination and JARID2 over-expression in a thermal incubation experiment in Casque-Headed Lizard

Suárez-Varón

Mendoza‐Cruz

Acosta³

et al. 2022

PLoS ONE

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Non-avian reptiles, unlike mammals and birds, have undergone numerous sex determination changes. Casque-Headed Lizards have replaced the ancestral XY system shared across pleurodonts with a new pair of XY chromosomes. However, the evolutionary forces that triggered this transition have remained unclear. An interesting hypothesis suggests that species with intermediate states, with sex chromosomes but also thermal-induced sex reversal at specific incubation temperatures, could be more susceptible to sex determination turnovers. We contrasted genotypic data (presence/absence of the Y chromosome) against the histology of gonads of embryos from stages 35–37 incubated at various temperatures, including typical male-producing (26°C) and female-producing (32°C) temperatures. Our work apparently reports for the first time the histology of gonads, including morphological changes, from stages 35–37 of development in the family Corytophanidae. We also observed that all embryos developed hemipenes, suggesting sex-linked developmental heterochrony. We observed perfect concordance between genotype and phenotype at all temperatures. However, analysis of transcriptomic data from embryos incubated at 26°C and 32°C identified transcript variants of the chromatin modifiers JARID2 and KDM6B that have been linked to temperature-dependent sex determination in other reptiles. Our work tested the validity of a mixed sex determination system in the family Corytophanidae. We found that XY chromosomes are dominant; however, our work supports the hypothesis of a conserved transcriptional response to incubation temperatures across non-avian reptiles that could be a reminiscence of an ancestral sex determination system.

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Section: Methodsmentioning

confidence: 99%

Genetic determination and JARID2 over-expression in a thermal incubation experiment in Casque-Headed Lizard

Suárez-Varón

Mendoza‐Cruz

Acosta³

et al. 2022

PLoS ONE

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The male reproductive cycle of the brown basilisk Basiliscus vittatus (Squamata: Corytophanidae) from Tabasco, Southern Mexico

Rivera‐López,

Torres‐Martínez,

Hernández‐Franyutti

et al. 2024

Journal of Morphology

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We used histological and morphometric methods to study the testis and associated glands, including the epididymis, ductus deferens, and renal sexual segment (RSS), of specimens of Basiliscus vittatus sampled from Tabasco, Mexico (17.5926° N, 92.5816° W). Samples were collected throughout 1 year, which included the dry (February to May) and rainy (June to January) seasons. Spermatogenesis in B. vittatus is active throughout the year, but a significant increase in the testicular volume, diameters of seminiferous tubules, height of the germinal epithelium, spermiogenesis, and released spermatozoa occur in the dry season. During the rainy season, all aforementioned parameters decreased except the secretory activity of the epididymis and the RSS, which increased concomitant with an increase of the spermatozoa population within the ductus deferens. These data strongly suggest that B. vittatus reproduce year‐round, but males exhibit a peak in spermatogenic activity during the dry season and a peak in insemination and/or copulation at the beginning of the rainy season. We highlight the importance of analyzing not only the testis but also accessory ducts and glands when determining the reproductive cycles of reptiles. The reproductive cycle of B. vittatus is discussed in relation to the environmental conditions of Southern Mexico and is compared to that of other squamates.

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Variación del estadio embrionario de Basiliscus vittatus (Squamata: Corytophanidae) en la oviposición

Cited by 2 publications

References 38 publications

Genetic determination and JARID2 over-expression in a thermal incubation experiment in Casque-Headed Lizard

Genetic determination and JARID2 over-expression in a thermal incubation experiment in Casque-Headed Lizard

The male reproductive cycle of the brown basilisk Basiliscus vittatus (Squamata: Corytophanidae) from Tabasco, Southern Mexico

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