Extreme homogeneity and low genetic diversity in Kryptolebias ocellatus from south-eastern Brazil suggest a recent foundation for this androdioecious fish population

Tatarenkov, Andrey; Lima, Sérgio M. Q.; Avise, John C.

doi:10.1111/j.1095-8649.2011.03155.x

Cited by 25 publications

(40 citation statements)

References 21 publications

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“…While researchers have addressed some aspects of systematics (Costa, 2006(Costa, , 2011, evolutionary history (Costa et al, 2010;Tatarenkov et al, 2009Tatarenkov et al, , 2011, and geographic distribution (Sarmento-Soares et al, 2014;Lira et al, 2015), there is little available information regarding natural history, ecology and population dynamics. Despite the large gap in our knowledge of the biology of K. hermaphroditus, the recent studies above mentioned, including the present one, suggest some interesting perspectives for studies on evolution, morphology, behavior and physiology across the species' wide geographic distribution in the mangroves of the Brazilian coast.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, self-fertilizing hermaphroditism is the dominant mode of reproduction in Kryptolebias marmoratus distributed from Florida to Venezuela (Tatarenkov et al, 2011) and K. hermaphroditus occurring in the Atlantic Forest mangroves of Brazil (Lira et al, 2015). This clade represents the only occurrence of self-fertilizing hermaphroditism among vertebrates (Tartarenkov et al, 2009;Costa et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Because of its reproductive mixedmated system, K. marmoratus has been a popular model species for embryological, physiological, behavioral and genetic studies (Avise & Tatarenkov, 2015). While males are rare in K. marmoratus, they are considered to be absent in K. hermaphroditus (Costa, 2011;Tatarenkov et al, 2011), despite this species having been known at least since 1868 (previously known as K. ocellatus) and numerous museum and unpreserved specimens have been examined (Costa, 2011). Due to the absence of males in fish collections, and following a re-examination of the holotype of K. ocellatus, the monomorphic hermaphrodite species from Brazil was described as K. hermaphroditus (Costa, 2011).…”

Section: Introductionmentioning

confidence: 99%

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First record of a male of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Cynolebiidae)

2016

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During an ichthyological survey in September 2015 at the Ceará-Mirim River estuary, Rio Grande do Norte State, northeastern Brazil, we collected a male of Kryptolebias hermaphroditus, a cynolebiid species that had been previously described as containing exclusively self-fertilizing hermaphrodites. This is the first record of a male in this species, over 140 years after the discovery of the mangrove rivulid species from Brazil. Our discovery reinforces the need for more studies in K. hermaphroditus, as well as the potential of this species as a model for evolutionary studies due to its unique mating system. Durante uma amostragem ictiológica em setembro de 2015 no estuário do rio Ceará-Mirim, Estado do Rio Grande do Norte, Nordeste do Brasil, nós coletamos um macho de Kryptolebias hermaphroditus, uma espécie de rivulídeo que foi descrita como contendo apenas hermafroditas auto-fertilizantes. Este é o primeiro registro de um macho dessa espécie, mais de 140 anos depois da descoberta das espécies de rivulídeos de manguezais do Brasil. Nossa descoberta reforça a necessidade de mais estudos em K. hermaphroditus, assim como, o potencial desta espécie como um modelo para estudos evolutivos devido ao seu sistema reprodutivo único.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First record of a male of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Cynolebiidae)

2016

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“…Concerning K. hermaphroditus, no males or molecular evidence of sexual reproduction has been found among populations from southeastern Brazil (Tatarenkov et al 2011). As the occurrence of males seems to be directly related to warmer temperatures, the development of males and sexual reproduction is more probable in populations of northeastern Brazil.…”

mentioning

confidence: 93%

“…During recent collections, between 2011 and 2014, in coastal basins of northeastern Brazil, the occurrence of K. hermaphroditus (Figure 1) (Tatarenkov et al 2011). Thus, it is likely that K. hermaphroditusis widely distributed along the Neotropical coastal drainages.…”

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confidence: 99%

First record of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Rivulidae) in the extreme north Atlantic Forest mangroves, Rio Grande do Norte state, Brazil

Lira¹,

Paiva²,

Ramos³

et al. 2015

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This study records the first occurrence of Kryptolebias hermaphroditus Costa, 2011 in canals or perennial salty water pools in two mangroves of the Rio Grande do Norte state, in the estuaries of Ceará-Mirim River and Curimataú River. Due to its hermaphroditism and self-fertilization, a unique feature among vertebrates, this species is very important for many biological areas. Kryptolebias hermaphroditus depends on favorable conditions for their development, therefore, human impacts such as shrimp farming and removal of native vegetation from mangroves may affect populations of this species in northeastern Brazil.

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DNA methylation in adults and during development of the self‐fertilizing mangrove rivulus, Kryptolebias marmoratus

Fellous

Labed‐Veydert

Locrel

et al. 2018

Ecology and Evolution

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In addition to genetic variation, epigenetic mechanisms such as DNA methylation might make important contributions to heritable phenotypic diversity in populations. However, it is often difficult to disentangle the contributions of genetic and epigenetic variation to phenotypic diversity. Here, we investigated global DNA methylation and mRNA expression of the methylation‐associated enzymes during embryonic development and in adult tissues of one natural isogenic lineage of mangrove rivulus fish, Kryptolebias marmoratus. Being the best‐known self‐fertilizing hermaphroditic vertebrate affords the opportunity to work with genetically identical individuals to examine, explicitly, the phenotypic effects of epigenetic variance. Using the LUminometric Methylation Assay (LUMA), we described variable global DNA methylation at CpG sites in adult tissues, which differed significantly between hermaphrodite ovotestes and male testes (79.6% and 87.2%, respectively). After fertilization, an immediate decrease in DNA methylation occurred to 15.8% in gastrula followed by re‐establishment to 70.0% by stage 26 (liver formation). Compared to zebrafish, at the same embryonic stages, this reprogramming event seems later, deeper, and longer. Furthermore, genes putatively encoding DNA methyltransferases (DNMTs), Ten‐Eleven Translocation (TET), and MeCP2 proteins showed specific regulation in adult gonad and brain, and also during early embryogenesis. Their conserved domains and expression profiles suggest that these proteins play important roles during reproduction and development. This study raises questions about mangrove rivulus’ peculiar reprogramming period in terms of epigenetic transmission and physiological adaptation of individuals to highly variable environments. In accordance with the general‐purpose genotype model, epigenetic mechanisms might allow for the expression of diverse phenotypes among genetically identical individuals. Such phenotypes might help to overcome environmental challenges, making the mangrove rivulus a valuable vertebrate model for ecological epigenetic studies. The mangrove rivulus, Kryptolebias marmoratus, is the best‐known self‐fertilizing hermaphroditic vertebrate that allows to work with genetically identical individuals to examine, explicitly, the phenotypic effects of epigenetic variance. The reprogramming event is later, more dramatic and longer than in other described vertebrates. High evolutionary conservation and expression patterns of DNMT, TET, and MeCP2 proteins in K. marmoratus suggest biological roles for each member in gametogenesis and development.

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Extreme homogeneity and low genetic diversity in Kryptolebias ocellatus from south-eastern Brazil suggest a recent foundation for this androdioecious fish population

Cited by 25 publications

References 21 publications

First record of a male of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Cynolebiidae)

First record of a male of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Cynolebiidae)

First record of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Rivulidae) in the extreme north Atlantic Forest mangroves, Rio Grande do Norte state, Brazil

DNA methylation in adults and during development of the self‐fertilizing mangrove rivulus, Kryptolebias marmoratus

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