A5010736525- Genetic diversity and population structure
- Evolution and Genetic Dynamics
- Genomics and Phylogenetic Studies
- Genetic Mapping and Diversity in Plants and Animals
- Chromosomal and Genetic Variations
- Plant and animal studies
- Mathematical and Theoretical Epidemiology and Ecology Models
- Aquatic Ecosystems and Biodiversity
- RNA and protein synthesis mechanisms
- Genetic and phenotypic traits in livestock
- Fish Biology and Ecology Studies
- Plant and Fungal Species Descriptions
- Blood groups and transfusion
- Plant Disease Resistance and Genetics
- Enzyme Production and Characterization
- HIV Research and Treatment
- Animal Behavior and Reproduction
- Insect Resistance and Genetics
- Plant Taxonomy and Phylogenetics
- RNA Research and Splicing
- Rangeland Management and Livestock Ecology
- Genetic Associations and Epidemiology
- Ecology and Vegetation Dynamics Studies
- Plant Pathogens and Fungal Diseases
- Plant Pathogens and Resistance
Kyushu University
2012-2024
Komatsu University
2000-2009
Princeton University
2004
Forestry and Forest Products Research Institute
2000
National Institute of Genetics
1990-1993
National Institutes of Health
1990
North Carolina State University
1985-1989
Divergent natural selection acting on ecological traits, which also affect mate choice, is a key element of speciation theory, but has not previously been demonstrated at the molecular gene level to our knowledge. Here we demonstrate parallel evolution in two cichlid genera under strong divergent that affects both. Strong fixed opsin proteins with different predicted light absorbance properties opposite ends an environmental gradient. By expressing them and measuring absorbance, show...
Abstract While many plant species are considered threatened under anthropogenic pressure, it remains uncertain how rapidly we losing diversity. To fill this gap, propose a Global Legume Diversity Assessment (GLDA) as the first step of global diversity assessment. Here describe concept GLDA and its feasibility by reviewing relevant approaches data availability. We conclude that Fabaceae is good proxy for overall angiosperm in habitats much available. As indicators states, comparison richness...
Nucleotide sequences from four chloroplast genes, the matK, chlL , intergenic spacer (IGS) region between trnL and trnF an intron of were determined all species Taxodiaceae five Cupressaceae sensu stricto (s.s.). Phylogenetic trees constructed using maximum parsimony neighbor‐joining methods with Cunninghamia as outgroup. These analyses provided greater resolution relationships among genera higher bootstrap supports for clades compared to previous analyses. Results indicate that Taiwania...
Abstract In order to clarify the nature of "near neutrality" in molecular evolution and polymorphism, extensive simulation studies were performed. Selection coefficients new mutations are assumed be small so that both random genetic drift selection contribute determining behavior mutants. The model also incorporates normally distributed spatial fluctuation coefficients. If system starts from "average neutrality," it will move a better adapted state, most become "slightly deleterious." Monte...
Abstract The evolution of short repeated sequences by replication slippage under the assumption selective neutrality is modeled using a linear birth and death process. equilibrium distribution, distribution life expectancy sequence when process starts from two repeats, age probability obtaining genes with i j copies which diverged t generations ago conditional variance copy number given repeat more than one are computed. distributions shown to have long tails. Also statistic estimates large...
The coding sequences ( approximately 1 kb) of FUT2 [ABO-Secretor type alpha(1,2)fucosyltransferase] and FUT6 [plasma alpha(1,3)fucosyltransferase] were analyzed for allelic polymorphism by direct sequencing in five populations. nucleotide diversities estimated from pairwise sequence differences 0.0045, 0.0042, 0.0009, 0.0008 Africans, European-Africans, Iranians, Chinese, Japanese, respectively. 0.0024, 0.0016, 0.0015, 0.0017, 0.0020 At FUT2, excesses compared to the number polymorphic sites...
Two missense polymorphisms (E272K and L374F) of the AIM1 locus, encoding a melanocyte differentiation antigen, were shown to have clear association with human ethnicities. These two nonpathogenic single nucleotide (SNPs) may be associated pigmentation variation. In this study, we investigated sequence variation in coding region exon-flanking found low genetic only subjects European descent. All four statistical tests applied 7.55-kb surrounding L374F polymorphism detected statistically...
Abstract Salmonid species contain numerous short interspersed repetitive elements (SINEs), known collectively as the HpaI family, in their genomes. Amplification and successive integration of individual SINEs into genomes have occurred during evolution salmonids. We reported previously a strategy for determining phylogenetic relationships among Pacific salmonids which these were used temporal landmarks evolution. Here, we provide evidence extensive genomic rearrangements that involved...
To study the permanency of response to selection for a quantitative character in finite populations and nature genetic effects that contribute this response, we have used covariance between ancestors descendents within populations. Effects variances are defined an initial equilibrium random mating monoecious population gives rise replicate After prescribed history restricted size, expanded, is quantified terms descent measures components as means determining additive variance Several...
Reproductive isolation that prevents interspecific hybridization between closely related coexisting species maintains sympatric diversity. One of the reproductive isolations is mate choice based on color signals (breeding perceived by vision). This well known in several animal taxa, yet little about its genetic and molecular mechanism. Lake Victoria cichlid fishes are thought to be an example In inhabiting different light environments rocky shore, speciation sensory drive through has been...
We investigated the nucleotide variation of a conifer, Cryptomeria japonica, and divergence between this species its closest relative, Taxodium distichum, at seven nuclear loci (Acl5, Chi1, Ferr, GapC, HemA, Lcyb, Pat). Samples C. japonica were collected from three areas, Kantou-Toukai, Hokuriku, Iwate. No apparent geographic differentiation was found among these samples. However, frequency spectrum polymorphism revealed excesses intermediate-frequency variants, which suggests that...
Abstract As a nearly neutral mutation model, the house-of-cards model is studied in finite populations using computer simulations. The distribution of mutant effect assumed to be normal. behavior mainly determined by product population size, N, and standard deviation, sigma, effect. If 4N sigma large compared one, few advantageous mutants are quickly fixed early generations. Then most becomes deleterious very slow increase average selection coefficient follows. It takes long for reach...
Dipterocarpaceae, trees that dominate tropical rain forests in Southeast Asia consist of many economically and ecologically important species. We determined partial sequences the PgiC gene from species Shorea, Hopea, Neobalanocarpus, Parashorea to elucidate phylogenetic relationships among these genera, which have been regarded as interrelated. The generated a tree with better resolution than previous cpDNA trees. is essentially consistent trees, except for placement Neobalanocarpus. shows...
We measured linkage disequilibrium in mostly noncoding regions of Cryptomeria japonica, a conifer belonging to Cupressaceae. Linkage was extensive and did not decay even at distance 100 kb. The average estimate the population recombination rate per base pair 1.55 × 10(-5) <1/70 that coding regions. discuss impact low rates large part genome on association studies.
Abstract Tol2 is a transposable element of the terminal-inverted-repeat class, residing in genome medaka fish Oryzias latipes. The genus contains more than 10 species for which phylogenetic relationships have previously been estimated. To infer history this we performed genomic Southern blots and PCR analyses species. It was revealed that occurs 2 (O. curvinotus O. latipes) length restriction map structure are identical two cases. Further, sequencing analysis an extremely low level...
We surveyed the molecular evolutionary characteristics of 11 nuclear genes from 10 conifer trees belonging to Taxodioideae, Cupressoideae, and Sequoioideae. Comparisons substitution rates among lineages indicated that synonymous Cupressoideae lineage were higher than those Taxodioideae. This result parallels pattern previously found in plastid genes. Likelihood-ratio tests showed nonsynonymous-synonymous rate ratio did not change significantly lineages. In addition, after adjustments for...
ABSTRACT To investigate whether or not an excess of additive genetic variance for viability detected in southern natural populations Drosophila melanogaster was created by diversifying selection, genotype-environment interaction tested as follows. (1) Two karyotype chromosomes were used: 61 second with the standard and 63 carrying In(2L)t. Their homozygote viabilities larger than 50% average random heterozygotes. (2) The effects two factors (culture media yeasts) examined at three levels...