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170 results for “Male fertility”
Data from: Reduced male fertility is common but highly variable in form and severity in a natural house mouse hybrid zone
Barriers to gene flow between naturally hybridizing taxa reveal the initial stages of speciation. Reduced hybrid fertility is a common feature of reproductive barriers separating recently diverged species. In house mice (Mus musculus), hybrid male sterility has been studied extensively using experimental crosses between subspecies. Here, we present the first detailed picture of hybrid male fertility in the European M. m. domesticus – M. m. musculus hybrid zone. Complete sterility appears rare or absent in natural hybrids but a large proportion of males (~30%) have sperm count or relative testis weight below the range in pure subspecies, and likely suffer reduced fertility. Comparison of a suite of traits related to fertility among subfertile males indicates reduced hybrid fertility in the contact zone is highly variable among individuals and ancestry groups in the type, number and severity of spermatogenesis defects present. Taken together, these results suggest multiple underlying genetic incompatibilities are segregating in the hybrid zone, which likely contribute to reproductive isolation between subspecies.
Data from: Lineage-independent retrotransposition of UTP14 associated with male fertility has occurred multiple times throughout mammalian evolution
In mammals, gamete production is essential for reproductive success. This is particularly true for males where large quantities of sperm are produced to fertilize a limited number of eggs released by the female. Because of this, new genes associated with increased spermatogenic efficiency have been accumulating throughout the evolution of therian mammals. Many of these new genes are testis-specific retrotransposed copies of housekeeping genes located on the X chromosome. Of particular interest are retrotransposed copies of UTP14 that are present in many distantly related eutherian mammals. Analysis of genomic data available in ENSEMBL indicates that these UTP14 retrogenes have arisen independently in the various eutherian clades. They represent an interesting aspect of evolution whereby new homologues of UTP14 have become independently fixed in multiple mammalian lineages due to the reproductive advantage that may be conferred to males. Surprisingly, these genes may also be lost, even after being present within a lineage for millions of years. This phenomenon may potentially be used to delineate evolutionary trees in closely related groups of mammals, particularly in the case of South American primates. Studying these retrogenes will yield new insights into the evolutionary history of male gamete production and the phylogeny of eutherian mammals.
Fig. 22. Planaltina myersi, MNRJ 10634, a in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)
Fig. 22. Planaltina myersi, MNRJ 10634, a mature male (below), 32.5 SL and a female (above) 36.8 mm SL, Brazil: Distrito Federal, córrego Fumal, where crosses road between Brasília and Planaltina, near Planaltina, about 15°20'S 47°50'W, collected 11 Apr. 1982 by L. E. de Macedo Cardoso. Note that the pale area on the anal fin of the male is where the anal-fin hooks are concentrated and the whitish color is due to the presence of anal-fin club cells.
Fig. 21 in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)
Fig. 21. Light micrographs through anal glandular tissue of mature male Bryconadenos tanaothoros. A, part of anal gland from a male of SL 36.6 mm (USNM 352061); bar, 100 µm. B, High magnification of the anal gland of a male of SL 39.8 mm (USNM 352061) in the area of cell release showing a degenerating cell (arrow) and a depression (*) remaining after cell release; bar, 10 µm.
Fig. 15 in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)
Fig. 15. Light micrographs through gonads of Bryconadenos tanaothoros. A, mid-sagittal section through testis of mature male, SL 36.6 mm (USNM 352061); sg, spermatogonial region; arrows, spermatozeugmata within storage region of testis; bar, 200 µm. B, testis storage region of same specimen showing well-organized spermatozeugmata (z); bar, 20 µm. C, section through ovary of mature female, SL 34.4 mm (USNM 352061), showing spermatozoa (sp) within ovarian lumen; o, oocyte cytoplasm; bar, 10 µm.
Fig. 13. Knodus meridae, USNM 121469 in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)
Fig. 13. Knodus meridae, USNM 121469. Type species of Knodus, a non-inseminating species. Caudal-fin squamation. Male, SL 21.0 mm, lateral view left side, portraying scales extended out onto caudal-fin rays. Venezuela: Trujillo, lago Maracaibo basin, río Motáin, 4 km above Motáin.
Fig. 11. Cladogram depicting hypothesized relationships among Clade A in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)
Fig. 11. Cladogram depicting hypothesized relationships among Clade A characids as modified here from Malabarba and Weitzman (2003) with the addition of Bryconadenos shown as a sister group of Attonitus and the placement of genera with inseminating species as possibly more closely related to one another than to non-inseminating Clade A genera.
Impact of Duloxetine on Male Fertility
ClinicalTrials.gov study NCT03038867. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Decisional Process in Male Fertility Preservation
ClinicalTrials.gov study NCT02411214. IPD Sharing: Not stated. Countries: 0. Publications: 1.
Data from: Lineage-independent retrotransposition of UTP14 associated with male fertility has occurred multiple times throughout mammalian evolution
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Data from: Evidence that fertility trades off with early offspring fitness as males age
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Data from: A general description of additive and non-additive elements of sperm competitiveness and their relation to male fertilization success
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Data from: Intergenomic interactions between mitochondrial and Y-linked genes shape male mating patterns and fertility in Drosophila melanogaster
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Data from: The Trojan Female Technique for pest control: a candidate mitochondrial mutation confers low male fertility across diverse nuclear backgrounds in Drosophila melanogaster
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Data from: Female house mice avoid fertilization by t haplotype incompatible males in a mate choice experiment
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Data from: Protein and carbohydrate intake influence sperm number and male fertility in male cockroaches but not sperm viability
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Data from: Reduced male fertility is common but highly variable in form and severity in a natural house mouse hybrid zone
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NAT10-mediated N4-Acetylcytidine is Required for Spermatogenesis and Male Fertility
GEO Series GSE191105. Mus musculus. 17 samples. Type: Expression profiling by high throughput sequencing.
Revealing RNA poly(A) tail dynamics during spermiogenesis and its function to support male fertility [dRNA-seq_mutants]
GEO Series GSE290699. Mus musculus. 12 samples. Type: Other.
The de novo DNA methyltransferase DNMT3C protects male fertility from transposon activity (RNA-Seq).
GEO Series GSE84139. Mus musculus. 8 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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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.