Rodent sperm morphology

Rodent sperm morphology
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear dimensions and dimensions-derived parameters calculated using formulae employed in sperm morphometry assessments.
Abstract This study investigated Automated Sperm Morphology Analysis to study rat sperm morphometry and morphology in two strains of rats (Sprague Dawley and Wistar) in three centers. The main aim was to develop normo-spermic baseline values for sperm morphometry and to quantify the percentage of morphologically normal sperm in healthy ...
Abstract Rodents have spermatozoa with features not seen in other species. Sperm heads in many rodent species bear one or more apical extensions known as "hooks." The process by which hooks have evolved, together with their adaptive significance, are still controversial issues. In order to improve our understanding of the biological meaning of these sperm head adaptations, we analyzed hook ...
Even within a single taxonomic group such as the rodents, sperm heads have evolved a remarkable spectrum of shapes. While mouse, rat, and hamster spermatozoa are hook-shaped, the sperm heads of some Australian rodents of the genus Pseudomys have also developed two auxiliary hooks 20, 21 that are not extensions of the acrosome.
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear ...
The morphometric analysis of the microscopic structure of the testes and epididymis in the rodent species Apodemus sylvaticus and Apodemus flavicollis is reported. In A. sylvaticus the epithelium forms 76.9%, interstitium 8.3% and lumen 14.8% of the
The levels of interspecific and intraspecific variation in morphometric parameters of spermatozoa have been studied in seven wild rodent species of the families Cricetidae and Muridae and inbred CBA mice. The study of intraspecific variability of parameters included an analysis of within-population age-related variation and variation among individuals within a population. It has been found ...
The focus of wildlife rodent sperm research has predominantly been morphological studies describing the complex structure of the sperm, relating it to phylogenetic/taxonomic affinities and the ...
It remains unclear how variation in the intensity of sperm competition shapes phenotypic and molecular evolution across clades. Mice and rats in the subfamily Murinae are a rapid radiation exhibiting incredible diversity in sperm morphology and ...
Discover what normal morphology of sperm means for your fertility. Learn about the 4% threshold, what your results mean, and how you can improve sperm health.
We compared and contrasted sperm morphology and dimensions in 9 genera and 18 species of the family Cricetidae. Spermatozoa were obtained from the cauda epididymes of animals previously fixed in 10% formalin, and stained with Giemsa or silver-nitrate staining methods.
1 Unraveling the Sperm Bauplan: Relations Be tween Sperm Head Morphology and Sperm Function in Rodents María Varea-Sánchez, Maximiliano Tourmente, Markus Bastir, and Eduardo R.S. Roldan 2,3
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear dimensions and dimensions-derived parameters calculated using formulae employed in sperm morphometry assessments.
Sperm competition is also expected to influence the evolution of specific sperm quality traits including sperm morphology (typically assessed using the length of the sperm head, midpiece, and flagellum), swimming speed, and viability (the proportion of functional sperm in an ejaculate) (Snook, 2005).
Rodents have spermatozoa with features not seen in other species. Sperm heads in many rodent species bear one or more apical extensions known as "hooks." The process by which hooks have evolved, together with their adaptive significance, are still controversial issues. In order to improve our unders …
Abstract We used automated sperm morphology analysis to investigate rat sperm morphometry and morphology in Sprague-Dawley and Wistar rats in three research centers to develop normal baseline values for sperm morphometry and to quantify the percentage of morphologically normal sperm in healthy rats.
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear dimensions and dimensions-derived parameters calculated using formulae employed in sperm morphometry assessments.
We used automated sperm morphology analysis to investigate rat sperm morphometry and morphology in Sprague-Dawley and Wistar rats in three research centers to develop normal baseline values for ...
PDF | Reproductive toxicity studies are increasingly including assessments of sperm parameters including motility, morphology, and counts. While these... | Find, read and cite all the research you ...
Reproduction and development are fascinating processes that exhibit significant differences among mammals. Successful propagation of species depends on male fertility and the ability of the sperm to fertilize and activate the egg and support early development. Remarkably, the specifics of how sperm structure and function have evolved and their crucial roles in fertility remain largely unknown ...
Download scientific diagram | Normal and abnormal morphology of rat sperms. A: Normal morphology; B: bent tail; C: double head; D: bent neck; E: flattened head. from publication: Aminoguanidine ...
Rodents have been the preferred models for the evaluation of the toxicity of pollutants and drugs and their genotoxic effects, including sperm shape abnormalities. The scientific literature is dominated by studies conducted with model animals in laboratory conditions, but a generally accepted and standardized protocol addressing the optimal number of sperm cells to count is still lacking. In ...
Download scientific diagram | The morphology of rat sperm from publication: Detection of Sprague Dawley Sperm Using Matching Method | Cross correlation algorithm is the common method for image ...
The structural organization of the spermatozoon from the Eurasian beaver, Castor fiber (Family: Castoridae), was determined and compared to that of other sciuromorph rodents. The beaver spermatozoon has a head, which is variable in form but usually
The San Diego Zoo Sperm Atlas was created in 2009 to display the diversity of sperm morphology in the Animal Kingdom. The vision of the Sperm Atlas is to create a tool for researchers, teachers, students, and those curious about biological diversity. It is the first free online educational database of its kind, and was made possible by the San Diego Zoo Reproductive Sciences sperm morphology ...
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear dimensions and dimensions-derived parameters calculated using formulae employed in sperm morphometry assessments.
In comparison to other mammalian species studied, particularly the rodents of the suborder Myomorpha (i.e. hamsters, rats and mice), the rodents herein investigated exhibited very high (~62-80 million) daily sperm production per testis gram.
Rodents' spermatozoa are relatively longer than primates' spermatozoa in total length. However, the range is extensive, 55-105 µm in primates and 35-258 µm in rodents. 2 The diversity of sperm shape is larger than that of oocyte shape. Why and how this diversity of sperm head and tail arose during evolution is a fascinating question.
Mammals exhibit a tremendous amount of variation in sperm morphology and despite the acknowledgement of sperm structural diversity across taxa, its functional significance remains poorly understood.
Sperm morphology varies considerably in mammals with extreme examples in several rodent lineages in which a wide range of sizes and complex head morphologies have been identified. Mammalian spermatozoa also differ in function, with swimming velocity and trajectory showing much divergence.
Using data on relative testis size to infer sperm competition levels, we test this hypothesis in rodents. We then test for correlations between sperm competition level and accessory components of the male reproductive tract in rodents.
In the rodent superfamily Muroidea, a model for the evolution of sperm form has been proposed in which it is suggested that a hook-shaped sperm head and long tail evolved from a more simple, nonhooked head and short tail in several different subfamilies. To test this model the shape of the sperm hea …
Further-more, the relationships between the three-dimensional internal ultrastructures and sperm morphology, as well as sperm swimming velocity and mitochondrial func-tions, have been poorly explored.
Sperm competition intensity shapes divergence in both sperm morphology and reproductive genes across murine rodents Emily E K Kopania, Gregg W C Thomas, Carl R Hutter,
In rodents, however, this represents some problems because sperm heads are falciform and asymmetric and morphology estimated from dimensions is less accurate. For these species, methods such as Procrustes-based geometric morphometrics, based on cell landmarks and semilandmarks, have been applied for the characterization of head shape [12] or ...
Download Citation | Molecular evolution of male reproduction across species with highly divergent sperm morphology in diverse murine rodents | Sperm competition can drive the rapid evolution of ...
This investigation determines the effects of depressed levels of intermale sperm competition, as shown by low relative testes mass, on testis and sperm morphology in three murine rodent tribes. In on...
Oct 2, 2024
This latter option allows for quantifying the morphology of the sperm head and tail (World Health Organization, 2010), with a bias toward measuring spherical sperm heads rather than heads with more irregular shapes (Santiago-Moreno et al., 2016).
Background Sperm morphology mainly refers to the shape of the head, the length of the flagellar segments, including the midpiece, principal piece and end piece, and the size of the accessory structures, including axonemes, outer dense fibers (ODFs), mitochondrial sheath (MS) and fibrous sheath (FS). Across species, there is considerable diversity in morphology. An established theory posits ...
Mammals exhibit a tremendous amount of variation in sperm morphology and despite the acknowledgement of sperm structural diversity across taxa, its functional significance remains poorly understood. Of particular interest is the sperm of rodents. While most Eutherian mammal spermatozoa are relativel …
The use of sperm morphology as a systematic character among mammal~ is relatively new, beginning with the study of British murid rodents by Friend (1936) Other studies dealing with rodent sperm ...
The Journal of Morphology publishes research in cytology, protozoology, embryology, and general animal morphology in vertebrates and invertebrates.
Rodents have spermatozoa with features not seen in other species. Sperm heads in many rodent species bear one or more apical extensions, known as "hook(s)". The process by which hooks have evolved, together with their adaptive significance,
It remains unclear how variation in the intensity of sperm competition shapes phenotypic and molecular evolution across clades. Mice and rats in the subfamily Murinae are a rapid radiation exhibiting incredible diversity in sperm morphology and production. We combined phenotypic and genomic data to …
Species preservation depends on the success of fertilization. Sperm are uniquely equipped to fulfill this task, and, although several mechanisms are conserved among species, striking functional differences have evolved to contend with particular sperm-egg environmental characteristics. This review highlights similarities and differences in sperm strategies, with examples within internal and ...
When it comes to understanding the diversity of South American rodents, sperm might have a lot to say—if you're willing to listen.
PDF | Background: Sperm morphology mainly refers to the shape of the head, the length of the flagellar segments, including the midpiece, principal... | Find, read and cite all the research you ...
Cut-off values for normal sperm morphology and toxicology for automated analysis of rat sperm morphology and morphometry Gerhard van Der Horst, Bongekile Skosana, Audrey Legendre, Peter Oyeyipo, Stephane Duplessis
Sperm morphology has long been used as a tool for placing species in a phylogenetic context and a range of selective forces are hypothesized to influence sperm evolution and diversification.
The percentage of motile spermatozoa and morphologically normal sperm was markedly reduced in rats from the group B. Rats from the C group showed an increase in velocity parameters, amplitude of lateral head displacement, decrease in beat-cross frequency, and an increase in abnormal sperm morphology.
In this study we apply the principles of geometric morphometrics to analyze rodent sperm head morphology and compare them with two traditional morphometry methods, that is, measurements of linear dimensions and dimensions-derived parameters calculated using formulae employed in sperm morphometry assessments.
Sperm morphology varies considerably both between and within species. The sperm of many muroid rodents bear an apical hook at the proximal end of the head. The curvature of the sperm hook varies grea...
In comparison to other mammalian species studied, particularly the rodents of the suborder Myomorpha (i.e. hamsters, rats and mice), the rodents herein investigated exhibited very high (~62-80 million) daily sperm production per testis gram.
In this study, we investigated the impact of sperm competition on sperm numbers, sperm morphology, acrosome integrity, sperm viability, and sperm motility in 18 muroid rodent species that differ widely in levels of sperm competition.
Background Sperm design varies enormously across species and sperm competition is thought to be a major factor influencing this variation. However, the functional significance of many sperm traits is still poorly understood. The sperm of most murid rodents are characterised by an apical hook of the sperm head that varies markedly in extent across species. In the European woodmouse Apodemus ...
In this study, we investigated the impact of sperm competition on sperm numbers, sperm morphology, acrosome integrity, sperm viability, and sperm motility in 18 muroid rodent species that differ widely in levels of sperm competition.
Sperm are the most morphologically variable cell type known, despite performing the same functional role of fertilizing eggs across all sexually reproducing species. Sperm morphology commonly ...
A recent study of sperm head morphology of the house mouse (Mus domesticus) used geometric morphometrics principles in an attempt to assess if sperm competition influences sperm head morphology.
Sperm morphometry, in combination with other morphological traits and sperm parameters, can be useful for developing a fertility index. In present study various morphological and morphometric characters of cauda epididymal spermatozoa from 30 house rats were measured. About 100 spermatozoa of each rat with normal morphology and abnormalities like abnormal head, midpiece swelling, coiled tail ...
Download scientific diagram | Classification of sperm morphology in rats: (a) normal sperm, (b) banana-shaped head, (c) amorphous head, (d) bent neck, (e) bent neck, (f) headless, (g) tailless, (h ...
Sperm competition can drive rapid evolution of male reproductive traits, but it remains unclear how variation in sperm competition intensity shapes phenotypic and molecular diversity across clades. Old World mice and rats (subfamily Murinae) comprise a rapid radiation and exhibit incredible diversity in sperm morphology and production. We combined phenotype and sequence data to model the ...
Sperm competition can drive rapid evolution of male reproductive traits, but it remains unclear how variation in sperm competition intensity shapes phenotypic and molecular diversity across clades. Old World mice and rats (subfamily Murinae) comprise a rapid radiation and exhibit incredible diversity in sperm morphology and production.
The murine rodents are the most speciose subfamily of mammals. Here the morphology of the spermatozoon, as determined by scanning and transmission electron microscopy of representative species from four Eurasian clades, is described. Much interspecific variability in all components of the spermatozo …
Conclusion The complex sperm head morphology in most of the hydromyine rodents is likely to date back over one million years with, in the plains mouse, interaction between sperm and egg during fertilisation involving sperm head stabilisation and zona pellucida attachment.
Sperm morphology varies considerably in mammals with extreme examples in several rodent lineages in which a wide range of sizes and complex head morphologies have been identified. Mammalian spermatozoa also differ in function, with swimming velocity and trajectory showing much divergence.
Keywords: Sperm , Mouse , CASA , Sperm morphology , Sperm motility , Sperm count Background Mice are the most widely used model organism in laboratories around the world because of their relatively simple breeding conditions, short reproduction cycles, and physiology close to humans.
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