keyword
MENU ▼
Read by QxMD icon Read
search

Temperature dependent sex determination

keyword
https://www.readbyqxmd.com/read/28430968/sex-chromosome-dependent-differential-viability-of-human-spermatozoa-during-prolonged-incubation
#1
Young-Ah You, Woo-Sung Kwon, Md Saidur Rahman, Yoo-Jin Park, Young-Ju Kim, Myung-Geol Pang
STUDY QUESTION: Are there significant differences in the ability of X chromosome-bearing (X) spermatozoa and Y chromosome-bearing (Y) spermatozoa to survive incubation under stressful conditions? SUMMARY ANSWER: Y spermatozoa are more vulnerable to stress than their X counterparts depending on culture period and temperature, and show higher expression of apoptotic proteins. WHAT IS KNOWN ALREADY: The primary sex ratio is determined by there being an equal number of spermatozoa carrying X and Y chromosomes...
April 19, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28399454/detection-of-a-synthetic-sex-steroid-in-the-american-crocodile-crocodylus-acutus-evidence-for-a-novel-environmental-androgen
#2
Christopher M Murray, Mark Merchant, Michael Easter, Sergio Padilla, Davinia B Garrigós, Mahmood Sasa Marin, Craig Guyer
Endocrine-disrupting contaminants (EDC's) are well known to alter sexual differentiation among vertebrates via estrogenic effects during development, particularly in organisms characterized by temperature-dependent sex determination. However, substances producing androgenic effects typically lack potency when tested in laboratory settings and are virtually unstudied in field settings. Here, we assay levels of a synthetic androgen, 17α-methyltestosterone (MT), in a heavily male-biased population of American crocodiles in the Tempisque River Basin of Costa Rica based on the recent hypothesis that this chemical is an EDC in developing crocodilian embryos...
April 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28321493/the-costs-of-locomotor-activity-maximum-body-temperatures-and-the-use-of-torpor-during-the-active-season-in-edible-dormice
#3
Claudia Bieber, Jessica S Cornils, Franz Hoelzl, Sylvain Giroud, Thomas Ruf
Measuring T b during the active season can provide information about the timing of reproduction and the use of short bouts of torpor and may be used as a proxy for the locomotor activity of animals (i.e., maximum T b). This kind of information is especially important to understand life-history strategies and energetic costs and demands in hibernating mammals. We investigated T b throughout the active season in edible dormice (Glis glis), since they (i) have an expensive arboreal life-style, (ii) are known to show short bouts of torpor, and (iii) are adapted to pulsed resources (mast of beech trees)...
March 21, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28296881/transcriptomic-responses-to-environmental-temperature-by-turtles-with-temperature-dependent-and-genotypic-sex-determination-assessed-by-rnaseq-inform-the-genetic-architecture-of-embryonic-gonadal-development
#4
Srihari Radhakrishnan, Robert Literman, Jennifer Neuwald, Andrew Severin, Nicole Valenzuela
Vertebrate sexual fate is decided primarily by the individual's genotype (GSD), by the environmental temperature during development (TSD), or both. Turtles exhibit TSD and GSD, making them ideal to study the evolution of sex determination. Here we analyze temperature-specific gonadal transcriptomes (RNA-sequencing validated by qPCR) of painted turtles (Chrysemys picta TSD) before and during the thermosensitive period, and at equivalent stages in soft-shell turtles (Apalone spinifera-GSD), to test whether TSD's and GSD's transcriptional circuitry is identical but deployed differently between mechanisms...
2017: PloS One
https://www.readbyqxmd.com/read/28296279/an-immunohistochemical-approach-to-identify-the-sex-of-young-marine-turtles
#5
Boris M Tezak, Kathleen Guthrie, Jeanette Wyneken
Marine turtles exhibit temperature-dependent sex determination (TSD). During critical periods of embryonic development, the nest's thermal environment directs whether an embryo will develop as a male or female. At warmer sand temperatures nests tend to produce female-biased sex ratios. The rapid increase of global temperature highlights the need for a clear assessment of its effects on sea turtle sex ratios. However, estimating hatchling sex ratios at rookeries remains imprecise due to the lack of sexual dimorphism in young marine turtles...
March 13, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28267461/quantitative-pteridine-fluorescence-analysis-a-possible-age-grading-technique-for-the-adult-stages-of-the-blow-fly-calliphora-vicina-diptera-calliphoridae
#6
Victoria Bernhardt, Laura Hannig, Ronja Kinast, Marcel A Verhoff, Florian Rothweiler, Richard Zehner, Jens Amendt
Age estimation of adult flies could extend the possible window of time for calculating the minimal postmortem interval (PMImin) by means of entomological methods. Currently, this is done by estimating the time required by necrophagous Diptera to reach certain juvenile developmental landmarks, and the method only works until the end of metamorphosis and emergence of the adult fly. Particularly at indoor crime scenes, being able to estimate the age of trapped adult flies would be an important tool with which to extend the calculable PMI beyond the developmental period...
March 4, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28243861/potential-contributions-of-heat-shock-proteins-and-related-genes-in-sexual-differentiation-in-yellow-catfish-pelteobagrus-fulvidraco
#7
Yan He, Jie Fang, Liyao Xue, Junjie Wu, Farman Ullah Dawar, Jie Mei
Sex determination and differentiation in ectotherms are very complicated affairs and usually affected by both genetic and environmental factors. Because of their temperature-sensitive expression, heat shock proteins (HSPs) are good candidates for temperature-dependent sex determination (TSD). Similar to most thermosensitive fish species, the male to female ratio increases with temperature in yellow catfish (Pelteobagrus fulvidraco). Yellow catfish is also a type of sexual size dimorphic fish, and the male individuals grow much faster than females of the same age...
February 28, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28179520/population-viability-at-extreme-sex-ratio-skews-produced-by-temperature-dependent-sex-determination
#8
Graeme C Hays, Antonios D Mazaris, Gail Schofield, Jacques-Olivier Laloë
For species with temperature-dependent sex determination (TSD) there is the fear that rising temperatures may lead to single-sex populations and population extinction. We show that for sea turtles, a major group exhibiting TSD, these concerns are currently unfounded but may become important under extreme climate warming scenarios. We show how highly female-biased sex ratios in developing eggs translate into much more balanced operational sex ratios so that adult male numbers in populations around the world are unlikely to be limiting...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28137821/improved-genome-assembly-of-american-alligator-genome-reveals-conserved-architecture-of-estrogen-signaling
#9
Edward S Rice, Satomi Kohno, John St John, Son Pham, Jonathan Howard, Liana F Lareau, Brendan L O'Connell, Glenn Hickey, Joel Armstrong, Alden Deran, Ian Fiddes, Roy N Platt, Cathy Gresham, Fiona McCarthy, Colin Kern, David Haan, Tan Phan, Carl Schmidt, Jeremy R Sanford, David A Ray, Benedict Paten, Louis J Guillette, Richard E Green
The American alligator, Alligator mississippiensis, like all crocodilians, has temperature-dependent sex determination, in which the sex of an embryo is determined by the incubation temperature of the egg during a critical period of development. The lack of genetic differences between male and female alligators leaves open the question of how the genes responsible for sex determination and differentiation are regulated. Insight into this question comes from the fact that exposing an embryo incubated at male-producing temperature to estrogen causes it to develop ovaries...
January 30, 2017: Genome Research
https://www.readbyqxmd.com/read/28051938/temperature-effects-on-development-and-phenotype-in-a-free-living-population-of-western-pond-turtles-emys-marmorata
#10
Nicole E Christie, Nicholas R Geist
Changes in temperature regimes are occurring globally due to climate change as well as habitat alterations. Temperatures are expected to continue to rise in the future, along with a greater degree of climatic instability. Such changes could have potentially serious consequences for oviparous ectotherms, especially those with temperature-dependent sex determination. To investigate the effects of temperature on a range of developmental phenomena in a population of western pond turtles (Emys marmorata), we placed temperature sensors on top of each layer of eggs within nests and recorded temperatures hourly through the first 2-3 mo of incubation...
January 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/27982504/climate-change-and-nesting-behaviour-in-vertebrates-a-review-of-the-ecological-threats-and-potential-for-adaptive-responses
#11
Mark C Mainwaring, Iain Barber, Denis C Deeming, David A Pike, Elizabeth A Roznik, Ian R Hartley
Nest building is a taxonomically widespread and diverse trait that allows animals to alter local environments to create optimal conditions for offspring development. However, there is growing evidence that climate change is adversely affecting nest-building in animals directly, for example via sea-level rises that flood nests, reduced availability of building materials, and suboptimal sex allocation in species exhibiting temperature-dependent sex determination. Climate change is also affecting nesting species indirectly, via range shifts into suboptimal nesting areas, reduced quality of nest-building environments, and changes in interactions with nest predators and parasites...
December 16, 2016: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/27912005/climate-change-increases-the-production-of-female-hatchlings-at-a-northern-sea-turtle-rookery
#12
J L Reneker, S J Kamel
The most recent climate change projections show a global increase in temperatures, along with major adjustments to precipitation, throughout the 21st century. Species exhibiting temperature-dependent sex determination are highly susceptible to such changes since the incubation environment influences critical offspring characteristics such as survival and sex ratio. Here we show that the mean incubation duration of loggerhead sea turtle (Caretta caretta) nests from a high-density nesting beach on Bald Head Island, North Carolina, USA has decreased significantly over the past 25 yr...
December 2016: Ecology
https://www.readbyqxmd.com/read/27902763/temperature-shift-alters-dna-methylation-and-histone-modification-patterns-in-gonadal-aromatase-cyp19a1-gene-in-species-with-temperature-dependent-sex-determination
#13
Yuiko Matsumoto, Brette Hannigan, David Crews
The environment surrounding the embryos has a profound impact on the developmental process and phenotypic outcomes of the organism. In species with temperature-dependent sex determination, gonadal sex is determined by the incubation temperature of the eggs. A mechanistic link between temperature and transcriptional regulation of developmental genes, however, remains elusive. In this study, we examine the changes in DNA methylation and histone modification patterns of the aromatase (cyp19a1) gene in embryonic gonads of red-eared slider turtles (Trachemys scripta) subjected to a temperature shift during development...
2016: PloS One
https://www.readbyqxmd.com/read/27891218/projected-changes-in-climatic-suitability-for-kinosternon-turtles-by-2050-and-2070
#14
Christopher J Butler, Brian D Stanila, John B Iverson, Paul A Stone, Matthew Bryson
Chelonians are expected to be negatively impacted by climate change due to limited vagility and temperature-dependent sex determination. However, few studies have examined how freshwater turtle distributions may shift under different climate change scenarios. We used a maximum entropy approach to model the distribution of five widespread North American Kinosternon species (K. baurii, K. flavescens, K. hirtipes, K. sonoriense, and K. subrubrum) under four climate change scenarios. We found that areas with suitable climatic conditions for K...
November 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/27887945/kisspeptin-system-in-pejerrey-fish-odontesthes-bonariensis-characterization-and-gene-expression-pattern-during-early-developmental-stages
#15
M Oswaldo Tovar Bohórquez, Alejandro S Mechaly, Lily C Hughes, Daniela Campanella, Guillermo Ortí, Luis F Canosa, Gustavo M Somoza
In vertebrates, kisspeptins and their receptors are known to be related to puberty onset and gonadal maturation, however, there are few studies concerning their role in early development. Here, we characterize the kisspeptin system in the pejerrey, Odontesthes bonariensis, a fish with strong temperature-dependent sex determination. We reconstructed the phylogenetic history of the two ligands (kiss1 and kiss 2) and two receptors (kissr2 and kissr3) in pejerrey in the context of recent classifications of bony fishes, determined their tissue distribution and documented the early expression pattern of these ligands and receptors...
February 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27815669/effect-of-agro-ecological-zone-season-of-birth-and-sex-on-pre-weaning-performance-of-nguni-calves-in-limpopo-province-south-africa
#16
T J Mpofu, M M Ginindza, N A Siwendu, K A Nephawe, B J Mtileni
The study was conducted to determine the effect of agro-ecological zone, season of birth and sex on Nguni calves' pre-weaning performance. Production indices such as birth weight (BW), weaning weight (WW), pre-weaning average daily gain (P-ADG) and pre-weaning gain (P-WG) were assessed in the different agro-ecological zones. Herd records on performance of 826 Nguni calves' from nine Nguni herds representing different agro-ecological zones: arid zone (n = 217); semi-arid zone (n = 296); dry sub-humid zone (n = 118) and humid zone (n = 195) were used for the analysis of pre-weaning calf performance...
January 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/27798296/thyroid-hormone-modulates-offspring-sex-ratio-in-a-turtle-with-temperature-dependent-sex-determination
#17
Bao-Jun Sun, Teng Li, Yi Mu, Jessica K McGlashan, Arthur Georges, Richard Shine, Wei-Guo Du
The adaptive significance of temperature-dependent sex determination (TSD) has attracted a great deal of research, but the underlying mechanisms by which temperature determines the sex of a developing embryo remain poorly understood. Here, we manipulated the level of a thyroid hormone (TH), triiodothyronine (T3), during embryonic development (by adding excess T3 to the eggs of the red-eared slider turtle Trachemys scripta, a reptile with TSD), to test two competing hypotheses on the proximate basis for TSD: the developmental rate hypothesis versus the hormone hypothesis Exogenous TH accelerated embryonic heart rate (and hence metabolic rate), developmental rate, and rates of early post-hatching growth...
October 26, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27794577/sex-reversal-in-reptiles-reproductive-oddity-or-powerful-driver-of-evolutionary-change
#18
Clare E Holleley, Stephen D Sarre, Denis O'Meally, Arthur Georges
Is sex a product of genes, the environment, or both? In this review, we describe the diversity of sex-determining mechanisms in reptiles, with a focus on systems that display gene-environment interactions. We summarise the field and laboratory-based evidence for the occurrence of environmental sex reversal in reptiles and ask whether this is a widespread evolutionary mechanism affecting the evolution of sex chromosomes and speciation in vertebrates. Sex determination systems exist across a continuum of genetic and environmental influences, blurring the lines between what was once considered a strict dichotomy between genetic sex determination and temperature-dependent sex determination...
2016: Sexual Development: Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation
https://www.readbyqxmd.com/read/27671871/a-timecourse-analysis-of-systemic-and-gonadal-effects-of-temperature-on-sexual-development-of-the-red-eared-slider-turtle-trachemys-scripta-elegans
#19
Michael Czerwinski, Anirudh Natarajan, Lindsey Barske, Loren L Looger, Blanche Capel
Temperature dependent sex determination (TSD) is the process by which the environmental temperature experienced during embryogenesis influences the sex of an organism, as in the red-eared slider turtle Trachemys scripta elegans. In accord with current paradigms of vertebrate sex determination, temperature is believed to exert its effects on sexual development in T. scripta entirely within the middle third of development, when the gonad is forming. However, whether temperature regulates the transcriptome in T...
December 1, 2016: Developmental Biology
https://www.readbyqxmd.com/read/27646974/comparison-of-cytotoxicity-between-extracts-of-clinacanthus-nutans-burm-f-lindau-leaves-from-different-locations-and-the-induction-of-apoptosis-by-the-crude-methanol-leaf-extract-in-d24-human-melanoma-cells
#20
Siat Yee Fong, Terrence Piva, Chaitali Dekiwadia, Sylvia Urban, Tien Huynh
BACKGROUND: Clinacanthus nutans (Burm. f.) Lindau leaves are widely used by cancer patients and the leaf extracts possess cytotoxic and antiproliferative effects on several human cancer cell lines. However, the effect of C. nutans leaf extract on human melanoma, which is the least common but most fatal form of skin cancer and one of the most common cancers diagnosed in both sexes worldwide, is unknown. There is also limited information on whether the bioactivity of extracts differs between C...
September 20, 2016: BMC Complementary and Alternative Medicine
keyword
keyword
60144
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"