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Lead researcher Prof Tracey Chapman, from UEA's school of Biological Sciences, said: “It's already known that seminal fluid proteins transferred from males during mating cause remarkable effects in females – including altered egg laying, feeding, immunity, sleep patterns, water balance and sexual receptivity.
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Read More »Sex can trigger remarkable female responses including altered fertility, immunity, libido, eating and sleep patterns - by the activation of diverse sets of genes, according to research published in Proceedings of the Royal Society B today. Researchers at the University of East Anglia studied how female Drosophila melanogaster - or fruit flies – respond to mating. They discovered that a single protein found in semen generates a wide range of responses in many genes in females, which become apparent at different times and in different parts of the female’s body following mating. The findings could in principle be akin to responses in many animals, including humans. Lead researcher Prof Tracey Chapman, from UEA’s school of Biological Sciences, said: “It’s already known that seminal fluid proteins transferred from males during mating cause remarkable effects in females – including altered egg laying, feeding, immunity, sleep patterns, water balance and sexual receptivity. “We tested here the effects of one enigmatic seminal fluid protein, known as the ‘sex peptide’, and found it to change the expression of a remarkable array of many genes in females – both across time and in different parts of the body. “There were significant alterations to genes linked to egg development, early embryogenesis, immunity, nutrient sensing, behaviour and, unexpectedly, phototransduction – or the pathways by which they see. “It showed that the semen protein is a ‘master regulator’ – which ultimately means that males effectively have a direct and global influence on the behaviour and reproductive system of the female. Such effects may well occur across many species. “An additional and intriguing twist is that the effects of semen proteins can favour the interests of males whilst generating costs in females, resulting in sexual conflict. “For example, there can be a tug-of-war, where males employ semen proteins to ensure that females make a large investment in the current brood – even if that doesn’t suit the longer term interests of females”.
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Read More »You might blame it on your genes: Researchers have linked excessive daytime sleepiness (EDS) to 42 genetic loci, or gene locations.
Feeling sleepy during the day? You might blame it on your genes: Researchers have linked excessive daytime sleepiness (EDS) to 42 genetic loci, or gene locations. EDS is a condition that affects 10-20% of the population. It is associated with several sleep disorders including sleep apnea, narcolepsy, and circadian rhythm disorders. The condition contributes to motor vehicle crashes, work-related accidents, and loss of productivity. Researchers have also associated EDS with an increased risk of stroke and heart disease. Studies suggest that genetic factors may contribute to this disorder, but the exact genes involved are unclear. In the current study, researchers studied self-reported daytime sleepiness data from more than 450,000 participants of European genetic ancestry using the UK Biobank. They then compared this data to a genetic analysis from this group. The researchers identified 42 genetic loci associated with EDS, including genes expressed in brain areas that are implicated in sleep-wake control and genes influencing metabolism. The study, funded in part by NHLBI, appeared in Nature Communications. NIDDK and NHGRI also provided support for this study.
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