Lukáš Kratochvíl
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View article: Elevated Testosterone Is Required for Male Sexual Behaviour and Dynamic Colour Change in Veiled Chameleons
Elevated Testosterone Is Required for Male Sexual Behaviour and Dynamic Colour Change in Veiled Chameleons Open
Introduction: Sex-specific genotype and early organization can influence the expression of sexually dimorphic traits in vertebrates. We tested these hypotheses in male-typical behaviour and rapid change to bright colouration in the veiled …
View article: Recombination plasticity in response to temperature variation in reptiles
Recombination plasticity in response to temperature variation in reptiles Open
The survival of species depends on their ability to adapt to environmental changes. While organisms are known to activate common transcriptional pathways in response to temperature variations, the impact of temperature on recombination, a …
View article: The Tree of Sex consortium: a global initiative for studying the evolution of reproduction in eukaryotes
The Tree of Sex consortium: a global initiative for studying the evolution of reproduction in eukaryotes Open
Reproduction is a fundamental aspect of life that affects all levels of biology, from genomes and development to population dynamics and diversification. The first Tree of Sex database synthesized a vast diversity of reproductive strategie…
View article: Concerted Evolution of Genus-Specific Centromeric Satellite DNA in Eremias (Lacertidae, Reptilia)
Concerted Evolution of Genus-Specific Centromeric Satellite DNA in Eremias (Lacertidae, Reptilia) Open
Background: Tandemly repeated satellite DNA sequences are an important part of animal genomes. They are involved in chromosome interactions and the maintenance of the integral structure of the nucleus, regulation of chromatin conformation …
View article: Natural repeated backcrosses lead to triploidy and tetraploidy in parthenogenetic butterfly lizards (Leiolepis: Agamidae)
Natural repeated backcrosses lead to triploidy and tetraploidy in parthenogenetic butterfly lizards (Leiolepis: Agamidae) Open
Obligatory parthenogenesis in vertebrates is restricted to squamate reptiles and evolved through hybridisation. Parthenogens can hybridise with sexual species, resulting in individuals with increased ploidy levels. We describe two successi…
View article: Sex Chromosome Turnovers and Stability in Snakes
Sex Chromosome Turnovers and Stability in Snakes Open
For a long time, snakes were presented as a textbook example of a group with gradual differentiation of homologous ZZ/ZW sex chromosomes. However, recent advances revealed that the ZZ/ZW sex chromosomes characterize only caenophidian snake…
View article: Convergent evolution in shape in European lineages of gobies
Convergent evolution in shape in European lineages of gobies Open
During their radiation, certain groups of animals evolved significant phenotypic disparity (morphological diversity), enabling them to thrive in diverse environments. Adaptations to the same type of environment can lead to convergent evolu…
View article: Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus <i>Darevskia</i>
Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus <i>Darevskia</i> Open
Among vertebrates, obligate parthenogenesis occurs exclusively in squamate reptiles. Premeiotic endoreplication in a small subset of developing oocytes has been documented as the mechanism of production of unreduced eggs in minutely explor…
View article: Complex ontogeny of sexual size dimorphism in a female‐larger gecko: Implications of determinate growth for lizard body size and life‐history evolution
Complex ontogeny of sexual size dimorphism in a female‐larger gecko: Implications of determinate growth for lizard body size and life‐history evolution Open
Ectothermic vertebrates such as reptiles were assumed to be indeterminate growers, which means that there is no terminal point in time or size for growth in their lifetime. In recent years, evidence for the determinate nature of growth in …
View article: Environmental (and Random?) Sex Determination in Endangered and Invasive <i>Phelsuma</i> Geckos
Environmental (and Random?) Sex Determination in Endangered and Invasive <i>Phelsuma</i> Geckos Open
Introduction: Sex is a fundamental characteristic of an individual. It is therefore puzzling why in some systems sex is precisely determined by a genotype, while in others it is influenced by the environment or even subtle, not to say rand…
View article: Pivotal temperature is not for everyone: Evidence for temperature‐dependent sex determination in three gecko species
Pivotal temperature is not for everyone: Evidence for temperature‐dependent sex determination in three gecko species Open
The prevalence of environmental sex determination (ESD) in squamate reptiles is often overestimated in the literature. This is surprising because we have reliable data demonstrating ESD in only a few species. The documentation of ESD in th…
View article: Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus<i>Darevskia</i>
Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus<i>Darevskia</i> Open
Among vertebrates, obligate parthenogenesis occurs exclusively in squamate reptiles. Premeiotic endoreplication in a small subset of developing oocytes has been documented as the mechanism of production of unreduced eggs in minutely explor…
View article: The fallacy of global comparisons based on <i>per capita</i> measures
The fallacy of global comparisons based on <i>per capita</i> measures Open
Media, social scientists and public health researchers often present comparisons across countries, and policy makers use such comparisons to take evidence-based action. For a meaningful comparison among countries, one often needs to normal…
View article: Catch-up growth and overweight adults in the offspring of young gecko mothers resembling low birth weight infants
Catch-up growth and overweight adults in the offspring of young gecko mothers resembling low birth weight infants Open
Endothermic and ectothermic amniotes differ in the timing of reproductive onset, with reptiles initiating reproduction before reaching final body size. Long-term consequences of maternal effect for early reptile offspring are poorly explor…
View article: Heteromorphic ZZ/ZW sex chromosomes sharing gene content with mammalian XX/XY are conserved in Madagascan chameleons of the genus Furcifer
Heteromorphic ZZ/ZW sex chromosomes sharing gene content with mammalian XX/XY are conserved in Madagascan chameleons of the genus Furcifer Open
Chameleons are well-known lizards with unique morphology and physiology, but their sex determination has remained poorly studied. Madagascan chameleons of the genus Furcifer have cytogenetically distinct Z and W sex chromosomes and occasio…
View article: Pristurus guweirensis Haas, 1943 (Gekkota: Sphaerodactylidae): the most abundant and widely distributed species of Pristurus previously referred to as Pristurus sp. 1
Pristurus guweirensis Haas, 1943 (Gekkota: Sphaerodactylidae): the most abundant and widely distributed species of Pristurus previously referred to as Pristurus sp. 1 Open
Burriel-Carranza, Bernat, Mazuch, Tomáš, Estarellas, Maria, Talavera, Adrián, Riaño, Gabriel, Koppetsch, Thore, Tamar, Karin, Tejero-Cicuéndez, Héctor, Saadi, Saleh Al, Busais, Salem, Kratochvíl, Lukáš, Shobrak, Mohammed, Šmíd, Jiří, Carra…
View article: The fallacy of global comparisons based on<i>per capita</i>measures
The fallacy of global comparisons based on<i>per capita</i>measures Open
Social and environmental scientists often present comparisons across countries and policy makers use such comparisons to take evidence-based action. For a meaningful comparison among countries, one often needs to normalize the measure for …
View article: Robertsonian fusion triggers recombination suppression on sex chromosomes in Coleonyx geckos
Robertsonian fusion triggers recombination suppression on sex chromosomes in Coleonyx geckos Open
The classical hypothesis proposes that the lack of recombination on sex chromosomes arises due to selection for linkage between a sex-determining locus and sexually antagonistic loci, primarily facilitated by inversions. However, cessation…
View article: Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes
Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes Open
Small erythrocytes might be beneficial for blood rheology, as they contribute less to blood viscosity than large erythrocytes. We predicted that rheological disadvantages of larger erythrocytes could be alleviated by relatively smaller nuc…
View article: Cytogenetic Analysis of Seven Species of Gekkonid and Phyllodactylid Geckos
Cytogenetic Analysis of Seven Species of Gekkonid and Phyllodactylid Geckos Open
Geckos (Gekkota), the species-rich clade of reptiles with more than 2200 currently recognized species, demonstrate a remarkable variability in diploid chromosome numbers (2n = 16–48) and mode of sex determination. However, only a small fra…
View article: Madagascar Leaf-Tail Geckos (Uroplatus spp.) Share Independently Evolved Differentiated ZZ/ZW Sex Chromosomes
Madagascar Leaf-Tail Geckos (Uroplatus spp.) Share Independently Evolved Differentiated ZZ/ZW Sex Chromosomes Open
Geckos are an excellent group to study the evolution of sex determination, as they possess a remarkable variability ranging from a complete absence of sex chromosomes to highly differentiated sex chromosomes. We explored sex determination …
View article: Supplementary Data from Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes
Supplementary Data from Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes Open
Data collected and analyzed within the frame of this study.
View article: Dataset from Catch-up growth and adult overweight in offspring of young gecko mothers resembling low birth weight infants
Dataset from Catch-up growth and adult overweight in offspring of young gecko mothers resembling low birth weight infants Open
Complete dataset
View article: ZZ/ZW Sex Chromosomes in the Madagascar Girdled Lizard, Zonosaurus madagascariensis (Squamata: Gerrhosauridae)
ZZ/ZW Sex Chromosomes in the Madagascar Girdled Lizard, Zonosaurus madagascariensis (Squamata: Gerrhosauridae) Open
Scincoidea, the reptilian clade that includes girdled lizards, night lizards, plated lizards and skinks, are considered as a lineage with diversity in sex-determining systems. Recently, the hypothesis on the variability in sex determinatio…
View article: Meiotic chromosome dynamics and double strand break formation in reptiles
Meiotic chromosome dynamics and double strand break formation in reptiles Open
During meiotic prophase I, tightly regulated processes take place, from pairing and synapsis of homologous chromosomes to recombination, which are essential for the generation of genetically variable haploid gametes. These processes have c…
View article: Development of male-larger sexual size dimorphism in a lizard: IGF1 peak long after sexual maturity overlaps with pronounced growth in males
Development of male-larger sexual size dimorphism in a lizard: IGF1 peak long after sexual maturity overlaps with pronounced growth in males Open
Squamate reptiles have been considered to be indeterminate growers for a long time. However, recent studies demonstrate that bone prolongation is stopped in many lizards by the closure of bone growth plates. This shift in the paradigm of l…
View article: Cytogenetic Analysis of the Members of the Snake Genera Cylindrophis, Eryx, Python, and Tropidophis
Cytogenetic Analysis of the Members of the Snake Genera Cylindrophis, Eryx, Python, and Tropidophis Open
The recent discovery of two independently evolved XX/XY sex determination systems in the snake genera Python and Boa sparked a new drive to study the evolution of sex chromosomes in poorly studied lineages of snakes, where female heterogam…