Identification of differentially expressed genes between adult males and adult females of the two-spotted spider mite (Tetranychus urticae)
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ABSTRACT: Sex-specific differences in gene expression underlie differences in morphology, behavior, and reproduction. To date, little is known about sex-specific differences in gene expression in spider mites, even though males and females differ markedly in morphology and behavior. In this study, we describe the complement of sex-specific gene expression differences between males and females of the two-spotted spider mite (Tetranychus urticae), an important generalist herbivore that is a significant crop pest. Gene expression differences were detected from analyses of mRNA-seq data collected with the Illumina method (eight samples in total consisting of four biological replicates each for males and females).
Project description:We generated 77-bp Illumina reads from single messenger RNA libraries from four diverse developmental stages of the two-spotted spider mite to maximally capture the complement of transcribed sequences across development. Adult, nymphal, larvae and embryonic stages were separated using sieves of various pore sizes, and mites of various developmental stages were carefully selected for transcriptome library preparation. Samples were a mix of males and females to capture male and female patterns of transcription, and were reared on beans (Phaseolus vulgaris cv California Red Kidney). The RNA-Seq data was used for validation of gene models predicted by EuGene, and to study patterns of gene expression across development. Gene expression for spider mites from adult, nymph, larvae and embryonic developmental stages was examined (technical replicates were generated).
Project description:We generated 38-bp Illumina reads from single messenger RNA libraries from three diverse developmental stages of the two-spotted spider mite to capture small RNA diversity across development. Adult, nymphal+larvae and embryonic stages were separated using sieves of various pore sizes, and mites of various developmental stages were carefully selected for small RNA library preparation. Samples were a mix of males and females to capture male and female patterns of small RNA composition and were reared on beans (Phaseolus vulgaris cv California Red Kidney). Small RNA reads were used for miRNA prediction, piRNA discovery, and for quantitation of small RNA-generating loci (i.e. expression across development). Examination of small RNA from spider mites of adult, embryonic and pooled larval/nymphal developmental stages.
Project description:We generated 77-bp Illumina reads from single messenger RNA libraries from four diverse developmental stages of the two-spotted spider mite to maximally capture the complement of transcribed sequences across development. Adult, nymphal, larvae and embryonic stages were separated using sieves of various pore sizes, and mites of various developmental stages were carefully selected for transcriptome library preparation. Samples were a mix of males and females to capture male and female patterns of transcription, and were reared on beans (Phaseolus vulgaris cv California Red Kidney). The RNA-Seq data was used for validation of gene models predicted by EuGene, and to study patterns of gene expression across development.
Project description:We generated 38-bp Illumina reads from single messenger RNA libraries from three diverse developmental stages of the two-spotted spider mite to capture small RNA diversity across development. Adult, nymphal+larvae and embryonic stages were separated using sieves of various pore sizes, and mites of various developmental stages were carefully selected for small RNA library preparation. Samples were a mix of males and females to capture male and female patterns of small RNA composition and were reared on beans (Phaseolus vulgaris cv California Red Kidney). Small RNA reads were used for miRNA prediction, piRNA discovery, and for quantitation of small RNA-generating loci (i.e. expression across development).
Project description:Substance use disorder (SUD) is a chronic neuropsychiatric condition characterized by long-lasting alterations in the neural circuitry regulating reward and motivation. Substantial work has focused on characterizing the molecular substrates which underlie these persistent changes in neural function and behavior; however, this work has overwhelmingly focused on male subjects, despite mounting clinical and preclinical evidence that females demonstrate dissimilar progression to SUD and responsivity to drugs of abuse, such as cocaine. Here, we show that sex is a critical biological variable that defines drug-induced plasticity in the NAc. Using quantitative mass spectrometry, we assessed the protein expression patterns altered by cocaine self-administration and demonstrate unique molecular profiles between males and females. We show that 1. Cocaine self-administration induces non-overlapping protein expression patterns in males and females and 2. Cocaine specifically acts on baseline sexual dimorphisms to exert these effects. Critically, we find that cocaine administration blunts not only basal sex-differences in the accumbens proteome, but also the pre-existing sex differences in behavior for natural rewards. Together, these data suggest that chronic cocaine is capable of rewriting baseline proteomic function to maintain cocaine-specific behaviors.
Project description:We sought to investigate the scope of cellular and molecular changes within a mouse’s olfactory system as a function of its exposure to odors emitted from members of the opposite sex. To this end, we housed mice either separated from members of the opposite sex (sex-separated) or together with members of the opposite sex (sex-combined) until six months of age and then profiled transcript levels within the main olfactory epithelium (MOE), vomeronasal organ (VNO), and olfactory bulb (OB) of the mice via RNA-seq. For each tissue type, we then analyzed gene expression differences between sex-separated males and sex-separated females (SM v SF), sex-combined males and sex-combined females (CM v CF), sex-separated females and sex-combined females (SF v CF), and sex-separated males and sex-combined males (SM v CM). Within both the MOE and VNO, we observed significantly more numerous gene expression differences between males and females when mice were sex-separated as compared to sex-combined. Chemoreceptors were highly enriched among the genes differentially expressed between males and females in sex-separated conditions, and these expression differences were found to reflect differences in the abundance of the corresponding sensory neurons.
Project description:Sexual dimorphisms in the brain give rise to sex differences in physiology and behavior, yet we have limited understanding of the transcriptomic changes underlying their development. We evaluated developmental transcriptome dynamics for one of the most extreme neuroanatomical sexual dimorphisms in vertebrates - the songbird robust nucleus of the arcopallium (RA). RA is the telencephalic motor output nucleus of the song system. It grows monomorphically for the first few weeks posthatch, then continues growing in males but regresses in females, becoming 5-7 times larger in males. We quantified RA gene expression from monomorphic and dimorphic stages of development in both sexes. Mirroring the morphology, male and female transcriptomes initially resembled one other, then diverged markedly. Thousands of genes showed developmental regulation, corresponding to highly sex-specific biological processes. Males showed enrichments for neuronal growth and morphogenesis, synapse organization, metabolism, and voltage-gated ion channels. Females showed enrichments for cell polarity and differentiation, chemotaxis inhibition, gene silencing, and hormone and immune signaling. Notably, the majority of sex-biased genes in monomorphic RA were sex chromosome Z genes. These findings reveal a profound, sex-specific reorganization of RA’s transcriptome, providing novel insights into potential targets and drivers of sexually dimorphic neurodevelopment.
Project description:Identification of differentially expressed genes between adult males and adult females of the two-spotted spider mite (Tetranychus urticae)
Project description:Obesity has reached epidemic levels and obesity increases the risk for negative health outcomes including type 2 diabetes. Sex differences are evident in metabolic homeostasis with differences seen both in amount and location of adipose stores. Males store more adipose viscerally whereas females store adipose subcutaneously. Interestingly, this can be affected by the brain. The arcuate nucleus of the hypothalamus is a key brain region that exerts control over feeding behavior and metabolism. The cells of the arcuate are heterogeneous in their transcriptomic expression and in their functions. Here we perform single nuclei RNA-sequencing of the arcuate in females and males under varying nutritional states. We found that Agrp neurons were the most sensitive to nutritional state and this was more pronounced in females than in males. KNDy neurons were also sensitive to nutritional state and major sex differences were observed. Dopamine neurons of the arcuate had major sex differences. Ghrh neurons saw moderate nutritional regulation and sexual dimorphism. Both microglia and oligodendrocytes had moderate differences observed between nutritional states. This study represents the first major effort to characterize sex differences across nutritional states in the arcuate.
Project description:Sex differences in the brain have been demonstrated in all major vertebrate lineages but are not well understood at a molecular and cellular level. Sex-changing fishes provide a unique opportunity to uncover mechanisms underlying sexual differentiation of the brain and regulation of sexual phenotypes. Sex change requires the complete transformation of the gonads and behaviors, which in turn require transformation of sexually-differentiated control mechanisms in the brain. However, detailed molecular and cellular profiling of sex differences in the brains of sex-changing fish is lacking. In this study we applied single nucleus RNA-sequencing (snRNA-seq) to generate the first atlas of sex differences in preoptic area (POA) and telencephalon of the model anemonefish Amphiprion ocellaris. We uncovered remarkably widespread sex differences in cell-type abundance and cell-type transcriptome. The most prominent difference was observed in the dorsal medial telencephalon where females displayed more than twice as many glutamatergic neurons as males and more than 400 differentially expressed genes consistent with immature neuronal development in males relative to females. These results provide an unparalleled level of depth to our understanding of sexual differentiation in the brain of a sex-changing fish, and richly characterizes numerous specific sexual dimorphisms that must develop during sex change.