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233 results for “sex determination”
Data for: Cephalopod Sex Determination and its Ancient Evolutionary Origin
<p>This repository contains the chromosome-level genome assembly, annotation, and genome hub files of the California two-spot octopus (<em>Octopus bimaculoides</em>). These data resulted in the discovery of the cephalopod sex chromosomes. Read the paper in <em>Current Biology </em>here: https://doi.org/10.1016/j.cub.2025.01.005. </p>
Mapping of multiple complementary sex determination loci in a parasitoid wasp
<p>Files required to reproduce the analysis from the manuscript "Mapping of Multiple Complementary Sex Determination Loci in a Parasitoid Wasp" published in Genome Biology and Evolution (doi: 10.1093/gbe/evz219). The code is hosted on the github repository CSD_lfabarum github repository (https://github.com/cmdoret/CSD_lfabarum.</p>
Assembled chromosomes of the blood fluke Schistosoma mansoni provide insight into the evolution of its ZW sex-determination system
<p><em>Schistosoma mansoni </em>has a diploid genome of approximately 380 MB, organized in 7 pairs of autosomes and 2 sex chromosomes. The original <em>Schistosoma mansoni </em>Genome Project was completed by the Wellcome Sanger Institute in collaboration with The Institute for Genome Research using a Whole Genome Shotgun sequencing strategy. The draft assembly was subsequently improved first by incorporating Illumina reads from a clonal (single-miracidial) infection and more recently by incorporating long PacBio reads, HiC, and optical mapping data.</p> <p>Associated manuscript can be found at https://www.biorxiv.org/content/10.1101/2021.08.13.456314v1</p>
Dataset from Castel et al. 'Genetic sex determination in three closely related hydrothermal vent gastropods, including one species with intersex individuals'
<p>This is the dataset used in "Genetic sex determination in three closely related hydrothermal vent gastropods, including one species with intersex individuals"<br>Castel J, Pradillon F, Cueff V, Leger G, Daguin-Thiébaut C, Ruault S, Mary J, Hourdez S, Jollivet D, and Broquet T</p>
Figure 2 in Sexual size dimorphism and sex determination by external measurements in the Redshank Tringa totanus
Figure 2. Distribution of the discriminant score D calculated for males and females sexed molecularly. Gray and white bars are for correct and incorrect classifications. Dashed lines show D border values of –0.96 and 1.17, which allowed for 95% of correct classifications of males and females.
Figure 1 in Sexual size dimorphism and sex determination by external measurements in the Redshank Tringa totanus
Figure 1. Wing length distribution of male (black bars) and female (gray bars) Redshanks caught in southern Belarus.
Data from: Chromosome-scale assembly with a phased sex-determining region resolves features of early Z and W chromosome differentiation in a wild octoploid strawberry
<p>Abstract: When sex chromosomes stop recombining, they start to accumulate differences. The sex-limited chromosome (Y or W) especially is expected to degenerate via the loss of nucleotide sequence and the accumulation of repetitive sequences. However, how early signs of degeneration can be detected in a new sex chromosome is still unclear. The sex determining region (SDR) of the octoploid strawberries is young, small, and dynamic. Using PacBio HiFi reads, we obtained a chromosome scale assembly of a female (ZW) <em>Fragaria chiloensis</em> plant carrying the youngest and largest of the known SDR on the W in strawberries. We fully characterized the previously incomplete SDR, confirming its gene content, genomic location and evolutionary history. Resolution of gaps in the previous characterization of the SDR added 10 kbp of sequence including a non-canonical LTR-retrotransposon; whereas the Z sequence revealed a <em>Harbinger</em> transposable element adjoining the SDR insertion site. Limited genetic differentiation of the sex chromosomes coupled with structural variation may indicate an early stage of W degeneration. The sex chromosomes have a similar percentage of repeats but differ in their repeat distribution. Differences in the pattern of repeats (transposable element polymorphism) apparently precede sex chromosome differentiation, thus potentially contributing to recombination cessation as opposed to being a consequence of it.</p> <p>Repository content: data (sequence alignments, phylogenetic trees, genome assembly, and vcf files) and scripts associated with the manuscript "Chromosome-scale assembly with a phased sex-determining region resolves features of early Z and W chromosome differentiation in a wild octoploid strawberry"</p>
Linked collectors and determiners for: Dasymutilla Ashmead (Hymenoptera, Mutillidae) in Panama: new species, sex associations and seasonal flight activity.
Natural history specimen data linked to collectors and determiners held within, "Dasymutilla Ashmead (Hymenoptera, Mutillidae) in Panama: new species, sex associations and seasonal flight activity". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/30786276-ef8a-4cf1-b6c7-1cf0c992b30a">https://bionomia.net/dataset/30786276-ef8a-4cf1-b6c7-1cf0c992b30a</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/30786276-ef8a-4cf1-b6c7-1cf0c992b30a">https://gbif.org/dataset/30786276-ef8a-4cf1-b6c7-1cf0c992b30a</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: Review of the genus Lomachaeta Mickel, 1936 (Hymenoptera: Mutillidae) with new species and sex associations.
Natural history specimen data linked to collectors and determiners held within, "Review of the genus Lomachaeta Mickel, 1936 (Hymenoptera: Mutillidae) with new species and sex associations". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/6a6ca226-8343-4208-8cdb-f0bd627c3817">https://bionomia.net/dataset/6a6ca226-8343-4208-8cdb-f0bd627c3817</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/6a6ca226-8343-4208-8cdb-f0bd627c3817">https://gbif.org/dataset/6a6ca226-8343-4208-8cdb-f0bd627c3817</a>. Formatted as a Frictionless Data package.
Figure 2 in Phylogeny of sex-determining mechanisms in squamate reptiles: are sex chromosomes an evolutionary trap?
Figure 2. Phylogenetic reconstruction of sex-determining mechanisms in squamate reptiles based on the molecular tree according to Townsend et al. (2004). For details see legend to Figure 1.
Figure 3 in Phylogeny of sex-determining mechanisms in squamate reptiles: are sex chromosomes an evolutionary trap?
Figure 3. Phylogenetic reconstruction of sex-determining mechanisms in squamate reptiles based on the molecular tree according to Vidal & Hedges (2005). For details see legend to Figure 1.
Figure 1 in Phylogeny of sex-determining mechanisms in squamate reptiles: are sex chromosomes an evolutionary trap?
Figure 1. Parsimony analysis of sex-determining mechanisms in squamate reptiles based on the 'morphological' tree. Circles indicate maximum-likelihood reconstructions of ancestral states, only nodes with significant reconstruction are shown (tested by likelihood-ratio test). Numbers in parentheses indicate the counts of species within a genus that share
Epistatic interactions between sex chromosomes and autosomes can affect the stability of sex determination systems
<p>Sex determination (SD) is an essential and ancient developmental process, but the genetic systems that regulate this process are surprisingly variable. Why SD mechanisms vary so much is a longstanding question in evolutionary biology. SD genes are generally located on sex chromosomes which also carry genes that interact epistatically with autosomes to affect fitness. How this affects the evolutionary stability of SD mechanisms is still unknown. Here, we explore how epistatic interactions between a sexually antagonistic (SA) non-SD gene, located on either an ancestral or novel sex chromosome, and an autosomal gene affect the conditions under which an evolutionary transition to a new SD system occurs. We find that when the SD gene is linked to an ancestral sex chromosomal gene which engages in epistatic interactions, epistasis enhances the stability of the sex chromosomes so that they are retained under conditions where transitions would otherwise occur. This occurs both when weaker fitness effects are associated with the ancestral sex chromosome pair or stronger fitness effects associated with a newly-evolved SD gene. However, the probability that novel SD genes spread is unaffected if they arise near genes involved in epistasis. This discrepancy occurs because on autosomes, SA allele frequencies are typically lower than on sex chromosomes. In our model, increased frequencies of these alleles contribute to a higher frequency of epistasis which may therefore more readily occur on sex chromosomes. Because sex chromosome-autosome interactions are abundant and can take several forms, they may play a large role in maintaining sex chromosomes.</p>
Variance components of sex determination in the copepod Tigriopus californicus estimated from a pedigree analysis
<p>Extensive theory exists regarding population sex ratio evolution that predicts equal sex ratio (when parental investment is equal). In most animals, sex chromosomes determine the sex of offspring, and this fixed genotype for sex has made theory difficult to test since genotypic variance for the trait (sex) is lacking. It has long been argued that the genotype has become fixed in most animals due to the strong selection for equal sex ratios. The marine copepod <em>Tigriopus californicus</em> has no sex chromosomes, multiple genes affecting female brood sex ratio and a brood sex ratio that responds to selection. The species thus provides an opportune system in which to test established sex ratio theory. In this paper, we further our exploration of polygenic sex determination in <em>T. californicus</em> using an incomplete diallel crossing design for analysis of the variance components of sex determination in the species. Our data confirm the presence of extra-binomial variance for sex, further confirming that sex is not determined through simple Mendelian trait inheritance. In addition, our crosses and backcrosses of isofemale lines selected for biased brood sex ratios show intermediate phenotypic means, as expected if sex is a threshold trait determined by an underlying "liability" trait controlled by many genes of small effects. Furthermore, crosses between families from the same selection line had similar increases in phenotypic variance as crosses between families from different selection lines, suggesting families from artificial selection lines responded to selection pressure through different underlying genetic bases. Finally, we estimate heritability of an individual to be male or female on the observed binary scale as 0.09 (95% CI: 0.034-0.14). This work furthers our accumulating evidence for polygenic sex determination in <em>T. californicus</em> laying the foundation for this as a model species in future studies of sex ratio evolution theory.</p>
Comparative genomics of sex-determination-related genes reveals shared evolutionary patterns between bivalves and mammals, but not fruit flies
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Data from: The thermal sensitivity of growth and survival in a wild reptile with temperature-dependent sex determination
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Epistatic interactions between sex chromosomes and autosomes can affect the stability of sex determination systems
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Data from: Potential drivers and implications of a balanced breeding sex ratio in a small population of an imperiled species with environmental sex determination
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Data from: Dioecy and chromosomal sex determination are maintained through allopolyploid speciation in the plant genus Mercurialis
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Variance components of sex determination in the copepod Tigriopus californicus estimated from a pedigree analysis
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.