Shin’ichi ITO

Gifu University, Gifu-shi, Gifu-ken, Japan

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Publications (13)11.51 Total impact

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    ABSTRACT: The dietary crude fat content consumed by wild Japanese macaques (Macaca ­fuscata) has previously been measured from the point of view of energy balance (Iwamoto 1982; Nakagawa 1989; Soumah and Yokota 1991). However, the fatty acid contents of the foods consumed by primates including Japanese macaques have not yet been reported, even though they are nutritionally important for humans. This paper is a summary of our previous report, which was written in Japanese (Koyama et al. 2008).
    No preview · Chapter · Dec 2009
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    ABSTRACT: After the dog genome was sequenced, an increasing number of studies involving genetic research of dogs have been conducted to understand gene functions and mammalian evolution. To study the genetic diversity in dogs and other mammals, genetic markers linked to function and conserved in wide lineages are necessary. Thus far, few polymorphic markers have been used in dogs. In this study, we surveyed the entire dog genome and predicted a total of 109 tandem repeats (TRs) located on the protein coding region that may be polymorphic by our prediction model. We selected 10 TRs that may be related to neurophysiology and neural developments, and tested them in 167 individuals of 8 dog breeds: 5 European dog breeds (Beagle, Golden Retriever, Labrador Retriever, German Shepherd, and Toy Poodle) and 3 Japanese dog breeds (Japanese Spitz, Shiba, and Shikoku). Among the tested TRs, nine were polymorphic indicating that 90% of the TRs were successfully predicted to be polymorphic. PCR fragments of the TRs were amplified from dog brain cDNA, showing their expression in the dog brain. Our results provide abundant opportunities for the study of phenotypic variations in dogs, and our prediction method for variable number of tandem repeats (VNTRs) can be applied to any other animal genome sequences for the survey of functional and polymorphic markers. Key wordsBrain-Breed-coding region-dog-VNTR
    Full-text · Article · Aug 2009 · Genes & genomics
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    ABSTRACT: Transferrin types in the Japanese quail Coturnix coturnix japonica are controlled by a single autosomal locus Tf with at least two codominant alleles TfB and Tfc. The frequencies of TfB and Tfc in a commercial population of the domestic quail were 1.00 and 0.00, respectively.Previous studies demonstrated that in the domestic populations of the Japanese quail three electrophoretic patterns AB, B and BC existed in egg white conalbumin and that the electrophoretic variation of conalbumin occurred in parallel with that of serum transferrin. Furthermore, from the preliminary mating experiments the transferrin-conalbumin variation was proposed to be under the control of at least two codominant alleles 77s and Tfc at an autosomal locus (Kimura et al., 1977, 1978).The present study was designed (1) to report a large amount of family data from three generations in order to support the previously published hypothesis on genetic control of electrophoretic patterns of transferrin, and (2) to survey the gene constitution of transferrin in a commercial population of the domestic quail.Sera were added with iron, heated for 5 min at 65°C (Stratil, 1967), then were investigated by means of horizontal starch gel electrophoresis. Hydrolysed starch from Connaught Medical Laboratories, Toronto, was used. A discontinuous citrate/Tris/LiOH/borate buffer system (pH 8.0) of Ferguson & Wallace (1961) was employed. The gels were stained with Amido Black 10B.
    No preview · Article · Apr 2009 · Animal Genetics
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    ABSTRACT: Egg production is of critical importance in birds not only for their reproduction but also for human consumption as the egg is a highly nutritive and balanced food. Consequently, laying in poultry has been improved through selection to increase the total number of eggs laid per hen. This number is the cumulative result of the oviposition, a cyclic and repeated process which leads to a pattern over time (the egg laying curve) which can be modelled and described individually. Unlike the total egg number which compounds all variations, the shape of the curve gives information on the different phases of egg laying, and its genetic analysis using molecular markers might contribute to understand better the underlying mechanisms. The purpose of this study was to perform the first QTL search for traits involved in shaping the egg laying curve, in an F2 experiment with 359 female Japanese quail. Eight QTL were found on five autosomes, and six of them could be directly associated with egg production traits, although none was significant at the genome-wide level. One of them (on CJA13) had an effect on the first part of the laying curve, before the production peak. Another one (on CJA06) was related to the central part of the curve when laying is maintained at a high level, and the four others (on CJA05, CJA10 and CJA14) acted on the last part of the curve where persistency is determinant. The QTL for the central part of the curve was mapped at the same position on CJA06 than a genome-wide significant QTL for total egg number detected previously in the same F2. Despite its limited scope (number of microsatellites, size of the phenotypic data set), this work has shown that it was possible to use the individual egg laying data collected daily to find new QTL which affect the shape of the egg laying curve. Beyond the present results, this new approach could also be applied to longitudinal traits in other species, like growth and lactation in ruminants, for which good marker coverage of the genome and theoretical models with a biological significance are available.
    Full-text · Article · Feb 2006 · BMC Genetics

  • No preview · Article · Jan 2006 · Nihon Chikusan Gakkaiho

  • No preview · Article · Jan 2006
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    ABSTRACT: In Japan, approximately 30% of dogs that enter training programs to become drug detection dogs successfully complete training. To clarify factors related to the aptitude of drug detection dogs and develop an assessment tool, we evaluated genotypes and behavioural traits of 197 candidate dogs. The behavioural traits were evaluated within 2 weeks from the start of training and included 'general activity', 'obedience training', 'concentration', 'affection demand', 'aggression toward dogs', 'anxiety', and 'interest in target'. Principal components analysis of these ratings yielded two components: desire for work and distractibility. Desire for work was significantly related to successful completion of training (P < 0.001). Since 93.3% of dogs that passed training and 53.3% of the dogs that failed training had desire for work scores of 45 or higher, we will be able to reject about half of inappropriate dogs before 3 months of training by adopting this cut-off point. We also surveyed eight polymorphic regions of four genes that have been related to human personality dimensions. Genotypes were not related to whether dogs passed, but there was a weak relationship between distractibility and a 5HTT haplotype (P < 0.05). # 2006 Published by Elsevier B.V.
    Full-text · Article · Jan 2006 · Applied Animal Behaviour Science
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    ABSTRACT: The adipocyte is important not only for the storage of excess energy as fat, but also for the secretion of homeostatic factors. Gene expression profiles during adipocyte differentiation have been reported previously for mouse 3T3-L1 cells. However, the profiles of adipogenic gene expression in mice and cattle may be different because several metabolic pathways of the ruminant adipose tissue are different from those of non-ruminants. The gene expression profile in a clonal bovine intramuscular preadipocyte cell line during adipogenesis was examined using the polymerase chain reaction-subtraction method. Six hundred and twenty-one clones, which were expressed at an early stage of differentiation, from the preadipocyte to adipocyte, were isolated and characterized. Further detailed studies were carried out for 86 selected genes using northern blotting. Ten genes were found to be highly expressed after differentiation of bovine intramuscular preadipocyte cells. In particular, the expression profiles of genes for stearoyl CoA desaturase and FK506 binding protein were quite different from the time course of differentiation of that seen in the 3T3-L1 cells reported previously. In addition, these genes were assigned to bovine chromosomes using a bovine/hamster somatic cell hybrid panel and public database.
    No preview · Article · Sep 2005 · Animal Science Journal
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    ABSTRACT: Various dog breeds are remarkably different from each other not only in their sizes and shapes but also in behavioral traits, suggesting that some of these characteristics are under genetic control. However, little is known about genes related to behavioral traits in canine species. In humans, it has been reported that the dopamine receptor D4 gene (DRD4) includes polymorphism at several regions that relate to personality or psychiatric disorders. In an earlier study by the authors of the present study, the polymorphisms in canine DRD4 exon III and exon I regions were reported. In the present study, a novel polymorphism in canine DRD4 intron II was found based on a 17 base pair insertion/deletion, and the two alleles detected were named P (shorter allele) and Q (longer allele). The allelic distribution in 28 breeds of dog, including a total of 1114 unrelated individuals, were then investigated. Both P and Q alleles were detected in most of the breeds investigated; however, the frequencies of P and Q differed greatly between breeds. With respect to classification based on breed origin, P and Q alleles were frequent in Occidental and Oriental breeds, respectively. Furthermore, two subspecies of wolves, the ancestors of dogs, were analyzed for the comparison of allele frequencies with dogs, and the P allele was predominant in both European and Chinese wolves.
    Full-text · Article · Jan 2005 · Animal Science Journal
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    ABSTRACT: Twenty-eight original chicken microsatellite markers were isolated and characterized to determine their utility as cross-reactive markers for comparative genetic mapping in the order Galliformes. Primer pairs were typed in 12 unrelated chickens and also tested on Japanese quail and helmeted guinea fowl deoxyribonucleic acid (DNA). Polymorphism was observed in 23 (82.1%) of the markers and the average number of alleles per locus was 2.9 while the mean heterozygosity was 0.19. Eleven (39.3%) of the chicken markers cross-reacted with Japanese quail DNA and 2 (7.1%) with helmeted guinea fowl DNA. The cross-reactive markers described would serve as useful resources for comparative genetic mapping in poultry species belonging to the order Galliformes.
    No preview · Article · Jul 2003 · Animal Science Journal
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    ABSTRACT: The Japanese cormorants used in traditional fishing in Japan are wild derived and their sex cannot be determined from their appearance. Applicability of molecular sex determination based on the size difference between CHD1Z and CHD1W introns was confirmed in male and female Japanese cormorants whose sexes had been ascertained by pathological autopsy. All of 21 birds of unknown sex reared by a cormorant fishing master were identified as males. The molecular sexing method will provide valuable information on sex differences of wild Japanese cormorants, including tameness, trainability, behavior and fishing capability, as well as for future trials involving artificial reproduction.
    No preview · Article · Dec 2002 · Animal Science Journal
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    ABSTRACT: The D4 dopamine receptor (D4DR) polymorphic region, which is possibly related to the personality trait known as novelty seeking in humans, was examined in 34 dogs from two breeds (Golden retriever and the Japanese indigenous breed, Shiba) by the polymerase chain reaction (PCR), and the DNA sequences of each allele were determined. The polymorphic region of the dog D4DR gene was composed of 39- and 12- base pair (bp) units, and four alleles (A-D) were identified based on the number and/or order of these units. Intra- and inter-breed allele variations were observed. The frequency of the short A allele was dominant (78.9%) in the Golden retriever, while the long D allele was most common (46.7%) in the Shiba. These findings suggested that the allele frequency varied significantly between different breeds, and that analysis of the polymorphism in D4DR might be of use for understanding the behavioral traits of dogs.
    No preview · Article · Jan 2000 · Journal of Veterinary Medical Science
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Publication Stats

133 Citations
11.51 Total Impact Points


  • 2000-2009
    • Gifu University
      • Faculty of Applied Biological Sciences
      Gifu-shi, Gifu-ken, Japan
  • 2003
    • National Institute of Agrobiological Sciences
      Tsukuba, Ibaraki, Japan