A5019177216- Genetic diversity and population structure
- Fish Ecology and Management Studies
- Insect and Arachnid Ecology and Behavior
- Plant and animal studies
- Insect-Plant Interactions and Control
- Aquaculture Nutrition and Growth
- Chromosomal and Genetic Variations
- Genetic and phenotypic traits in livestock
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Genomics and Phylogenetic Studies
- Fish Biology and Ecology Studies
- Animal Behavior and Reproduction
- Forensic and Genetic Research
- Neurobiology and Insect Physiology Research
- Isotope Analysis in Ecology
- Marine and fisheries research
- Insect Resistance and Genetics
- Physiological and biochemical adaptations
- Neurological and metabolic disorders
- CRISPR and Genetic Engineering
- Peripheral Neuropathies and Disorders
- Reproductive biology and impacts on aquatic species
- Wine Industry and Tourism
- Fish biology, ecology, and behavior
- Genetics and Physical Performance
Hokkaido University
2007-2025
The University of Tokyo
2022-2025
National Institute of Genetics
2013-2023
The Graduate University for Advanced Studies, SOKENDAI
2019-2021
Science Council of Japan
2021
National Defense Academy of Japan
2021
University of the Ryukyus University Hospital
2020
Gifu Kyoritsu University
2020
Fukui Prefectural University
2020
Ryukoku University
2020
Well prepared It is well known that species radiate into new niches by adapting to novel environments. But why do some in this way, while other, related, not. Ishikawa et al. looked across sticklebacks determine some, originally marine, lineages were able colonize postglacial freshwater environments (see the Perspective Weber and Tong). They found a gene involved fatty acid desaturation was duplicated lineages. Transgenic manipulation of allowed marine synthesize acids thus survive on...
Sexual dimorphisms in trait expression are widespread among animals and especially pronounced ornaments weapons of sexual selection, which can attain exaggerated sizes. Expression traits is usually male-specific nutrition sensitive. Consequently, the developmental mechanisms generating sexually dimorphic growth nutrition-dependent phenotypic plasticity each likely to regulate extreme structures. Yet we know little about how either these work, much less they might interact with other. We...
Teleost fishes have independently colonized polar regions multiple times, facing many physiological and biochemical challenges due to frigid temperatures. Although increased gene copy numbers can contribute adaptive evolution in extreme environments, it remains unclear which categories of genes exhibit associated with colonization. Using 104 species ray-finned fishes, we systematically identified a significant correlation between number colonization after phylogenetic correction. Several...
Abstract Background Numerous cases of predator-induced polyphenisms, in which alternate phenotypes are produced response to extrinsic stimuli, have been reported aquatic taxa date. The genus Daphnia (Branchiopoda, Cladocera) provides a model experimental system for the study developmental mechanisms and evolutionary processes associated with polyphenisms. In D. pulex , juveniles form neckteeth predatory kairomones released by Chaoborus larvae (Insecta, Diptera). Results Previous studies...
Little is known about when, how or even if the wing development gene network elucidated in Drosophila deployed direct-developing insects. Here we identify genes (as determined Drosophila) of pea aphid (Acyrthosiphon pisum), which produces winged unwinged adults response to environmental cues. We find that principal studied are present genome and apterous decapentaplegic exhibit duplications. followed expression levels 11 these developmental at embryogenesis across nymphal instars. Six showed...
Recombination often differs markedly between males and females. Here we present the first analysis of sex-specific recombination in Gasterosteus sticklebacks. Using whole-genome sequencing 15 crosses G. aculeatus nipponicus, localized 698 crossovers with a median resolution 2.3 kb. We also used bioinformatic approach to infer historical sex-averaged patterns for both species. is greater females than on all chromosomes, overall map length 1.64 times longer The locations differ strikingly...
Adaptation to different salinities can drive and maintain divergence between populations of aquatic organisms. Anadromous stream ecotypes threespine stickleback (Gasterosteus aculeatus) are an excellent model explore the genetic mechanisms underlying osmoregulation divergence. Using a parapatric pair anadromous ecotypes, we employed integrated genomic approach identify candidate genes important for adaptation salinity environments. Quantitative trait loci (QTL) mapping plasma sodium...
Most aphids show reproductive polyphenism, i.e. they alternate their modes from parthenogenesis to sexual reproduction in response short photoperiods. Although juvenile hormone (JH) has been considered a likely candidate for regulating the transition asexual after photoperiod sensing, there are few studies investigating direct relationship between JH titres and reproductive-mode change. In addition, sequencing of pea aphid genome allowed identification genes involved pathway, which turn...
Differential gene expression can play an important role in phenotypic evolution and divergent adaptation. Although differential be caused by both local‐ distant‐regulatory changes, we know little about their relative contribution to transcriptome natural populations. Here, conducted quantitative trait loci (eQTL) analysis investigate the genetic architecture underlying divergence between marine stream ecotypes of threespine sticklebacks (Gasterosteus aculeatus). We identified local distant...
Abstract Closely related species of fish often exhibit different migration patterns. Even within species, anadromous and resident populations can be found in a diverse number taxa. Although several environmental factors that regulate behavioral physiological changes associated with have been identified, the genetic mechanisms underlying variation ability to respond these cues fishes show migratory behaviors are not well known. The three-spined stickleback Gasterosteus aculeatus (Linnaeus...
The pituitary gland is a key endocrine with various physiological functions including metabolism, growth, and reproduction. It comprises several distinct cell populations that release multiple polypeptide hormones. Although the major types are conserved across taxa, regulatory mechanisms of gene expression chromatin organization in specific remain poorly understood. Here, we performed simultaneous profiling transcriptome landscapes cells three-spined stickleback (Gasterosteus aculeatus),...
Abstract Convergent evolution, the evolution of same or similar phenotypes in phylogenetically independent lineages, is a widespread phenomenon nature. If genetic basis for convergent predictable to some extent, it may be possible infer organismic and capability organisms utilize new ecological resources based on genome sequence data. While repeated amino acid changes have been studied association with relatively little known about potential contribution gene copy number changes. In this...
Phenotypic plasticity, the ability of organisms to change their phenotype depending on external stimuli, enables survival in fluctuating environments. An extreme example is polyphenism, which a single genotype produces discrete phenotypes response cues. However, under persistent environmental conditions, natural selection would favor reduced plasticity. This study focused loss reproductive polyphenism and revealed underlying mechanism pea aphid Acyrthosiphon pisum. Although most populations...
Although similar patterns of phenotypic diversification are often observed in phylogenetically independent lineages, differences the magnitude and direction divergence have been also among even when exposed to same ecological gradients. The stickleback family is a good model with which explore genetic basis parallel nonparallel evolution, because there variety populations species that locally adapted divergent environments. as well mechanisms characterized threespine sticklebacks,...
Abstract With only a few absolute geographic barriers in marine environments, the factors maintaining reproductive isolation among organisms remain elusive. However, spatial structuring breeding habitat can contribute to isolation. This is particularly important for that migrate use fresh‐ or brackish water environments breed. The Japanese Gasterosteus stickleback species, Pacific Ocean three‐spined ( G. aculeatus ) and Japan Sea nipponicus overwinter sea, but rivers spawning. Although they...
Copy number variation (CNV) can cause phenotypic changes. However, in contrast to amino acid substitutions and cis-regulatory changes, little is known about the functional categories of genes which CNV important for adaptation novel environments. It also unclear whether same repeatedly change copy numbers adapting similar Here, we investigate associated with freshwater colonization fishes, was observed multiple times across different lineages. Using 48 ray-finned fishes diverse orders,...
Abstract Wing polyphenism in aphids represents an outstanding example of adaptive phenotypic plasticity. During summer, parthenogenic mother alter the developmental fate their embryos to produce wingless or winged adult forms response high population density (i.e. crowded conditions). Although this maternal effect is well known, mechanisms underlying transgenerational winged‐morph determination remain largely unresolved. In present study, effects different high‐density treatment durations...
An increasing number of exotic animals are causing ecological problems. Therefore, for better ecosystem management, it is important to understand how species colonize and adapt novel environments. The threespine sticklebacks (Gasterosteus aculeatus) can be a good vertebrate model system explore the genetic mechanisms adaptation not only in natural populations, but also non-native populations. Although morphological changes have been documented several introduced populations stickleback,...
SUMMARY In wing polyphenisms that produced alternative morphs depending on environmental conditions, the developmental regulations to balance between flight and reproductive abilities should be important. Many species of aphids exhibit polyphenisms, development muscles is thought incur costs ability. To evaluate relationship reproduction, fecundity wing‐ ovarian in parthenogenetic generations were compared winged wingless vetch aphid Megoura crassicauda . Although no differences offspring...