The ZZ/ZW sex-determining mechanism originated twice and independently during evolution of the frog, Rana rugosa

Ogata, Mitsuaki; Hasegawa, Yoshinori; Ohtani, Hiromi; Mineyama, Masaru; Miura, Ikuo

doi:10.1038/sj.hdy.6801068

Cited by 100 publications

(87 citation statements)

References 16 publications

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“…For example, a new sex-determination allele may invade a dioecious population under positive selection if it counteracts a pre-existing sex ratio bias in the population [100,101]. This appears to have occurred in the wrinkled frog Rana rugosa, in which evidence from population genetics and experimental crosses suggests that sex ratio bias resulting from the hybridisation of two male-heterogametic populations drove the invasion of a new, female-heterogametic sexdetermination locus [102,103]. Similarly, in populations of the female-heterogametic isopod crustacean Armadillidium vulgare, sex ratio bias caused by the bacterium Wolbachia can drive the W chromosome to extinction [104,105].…”

Section: J E Ironsidementioning

confidence: 99%

No amicable divorce? Challenging the notion that sexual antagonism drives sex chromosome evolution

Ironside¹

2010

BioEssays

119

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Ironside, J. E. (2010). No amicable divorce? Challenging the notion that sexual antagonism drives sex chromosome evolution. Bioessays, 32, (8), 718-726. IMPF: 04.47 RONO: 00Although sexual antagonism may have played a role in forming some sex chromosome systems, there appears to be little empirical or theoretical justification in assuming that it is the driving force in all cases of sex chromosome evolution. In many species, sex chromosomes have diverged in size and shape through the accumulation of mutations in regions of suppressed recombination. It is commonly assumed that recombination is suppressed in sex chromosomes due to selection to resolve sexually antagonistic pleiotropy. However, the requirement for a sex chromosome-specific mechanism for suppressing recombination is questionable, since more general models of recombination suppression on autosomes also appear to be applicable to sex chromosomes. Direct tests of the predictions of the sexual antagonism hypothesis offer only limited support in specific sex chromosome systems and circumstantial evidence remains open to interpretation.Peer reviewe

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Section: J E Ironsidementioning

confidence: 99%

No amicable divorce? Challenging the notion that sexual antagonism drives sex chromosome evolution

Ironside¹

2010

BioEssays

119

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“…Remarkably, quite different s.d. systems have often been adopted by closely related species, indeed even by different populations of the same species (for example, fish (Kallman, 1973) and amphibians (Ogata et al, 2008)). Such variation points to frequent transitions between one s.d.…”

Section: Introductionmentioning

confidence: 99%

Sex determination in dioecious Mercurialis annua and its close diploid and polyploid relatives

Russell

Pannell

2014

Heredity

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Separate sexes have evolved on numerous independent occasions from hermaphroditic ancestors in flowering plants. The mechanisms of sex determination is known for only a handful of such species, but, in those that have been investigated, it usually involves alleles segregating at a single locus, sometimes on heteromorphic sex chromosomes. In the genus Mercurialis, transitions between combined (hermaphroditism) and separate sexes (dioecy or androdioecy, where males co-occur with hermaphrodites rather than females) have occurred more than once in association with hybridisation and shifts in ploidy. Previous work has pointed to an unusual 3-locus system of sex determination in dioecious populations. Here, we use crosses and genotyping for a sex-linked marker to reject this model: sex in diploid dioecious M. annua is determined at a single locus with a dominant male-determining allele (an XY system). We also crossed individuals among lineages of Mercurialis that differ in their ploidy and sexual system to ascertain the extent to which the same sex-determination system has been conserved following genome duplication, hybridisation and transitions between dioecy and hermaphroditism. Our results indicate that the maledetermining element is fully capable of determining gender in the progeny of hybrids between different lineages. Specifically, males crossed with females or hermaphrodites always generate 1:1 male:female or male:hermaphrodite sex ratios, respectively, regardless of the ploidy levels involved (diploid, tetraploid or hexaploid). Our results throw further light on the genetics of the remarkable variation in sexual systems in the genus Mercurialis. They also illustrate the almost identical expression of sexdetermining alleles in terms of sexual phenotypes across multiple divergent backgrounds, including those that have lost separate sexes altogether.

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“…In the Japanese frog, Rana rugosa, two distinct sex chromosome types, XX/ XY and ZZ/ZW, were observed in the same species (Miura et al, 1998). In addition, the change of heterogametic sex from male to female appears to have independently occurred twice during frog speciation (Ogata et al, 2008). These results suggest that the sex chromosomes are generally not conserved in lower vertebrates.…”

Section: Plasticity Of Sex Chromosomes In Lower Vertebratesmentioning

confidence: 68%

Heritable artificial sex chromosomes in the medaka, Oryzias latipes

et al. 2009

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Chromosomal sex determination is widely used by vertebrates, however, only two genes have been identified as master sex-determining genes: SRY/Sry in mammals and DMY in the teleost medaka. Transfer of both genes into genetically female (XX) individuals can induce male development. However, transgenic strains have not been established in both cases because of infertility of the transgenic founders in mammals and low germline transmission rates in medaka. In this study, we used a BAC clone containing DMY in a 117 kb genomic region and two types of fluorescent marker to establish two DMY-transgenic medaka strains. In these strains, exogenous DMY is completely linked to a male phenotype and early gonadal development is not different from that of the wild-type strain. Sex-linkage analysis showed that the exogenous DMY was located on linkage group (LG) 23 in one strain and on LG 5 in the other strain, whereas the sex chromosome in medaka is on LG 1. Real-time PCR analysis indicated that these strains have multiple copies of DMY and higher DMY expression levels than the wild-type strain. These results showed that LGs 23 and 5 function as sex chromosomes in the two strains, respectively. This is not only the first example of the artificial generation of heritable sex chromosomes in vertebrates but also the first evidence showing plasticity of homomorphic sex chromosomes. This plasticity appears to be a characteristic of lower vertebrates and the underlying cause of frequent sex chromosome switching, recently reported in several fish and frog species.

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The ZZ/ZW sex-determining mechanism originated twice and independently during evolution of the frog, Rana rugosa

Cited by 100 publications

References 16 publications

No amicable divorce? Challenging the notion that sexual antagonism drives sex chromosome evolution

No amicable divorce? Challenging the notion that sexual antagonism drives sex chromosome evolution

Sex determination in dioecious Mercurialis annua and its close diploid and polyploid relatives

Heritable artificial sex chromosomes in the medaka, Oryzias latipes

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