World's Best Scientists 2026 revealed!
Ichizo Kobayashi

Ichizo Kobayashi

D-Index & Metrics

Genetics

D-Index
56
Citations
10920
World Ranking
3510
National Ranking
158

Ichizo Kobayashi publication distribution in Genetics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Genetics in 2026. The highlighted bar marks where Ichizo Kobayashi sits on this spectrum.

45–54 publications: 6 scientists 55–64 publications: 10 scientists 65–74 publications: 35 scientists 75–84 publications: 84 scientists 85–94 publications: 102 scientists 95–104 publications: 151 scientists 105–114 publications: 175 scientists 115–124 publications: 203 scientists 125–134 publications: 217 scientists 135–144 publications: 205 scientists 145–154 publications: 193 scientists 155–164 publications: 188 scientists 165–174 publications: 170 scientists 175–184 publications: 178 scientists 185–194 publications: 164 scientists 195–204 publications: 173 scientists 205–214 publications: 159 scientists 215–224 publications: 134 scientists 225–234 publications: 143 scientists 235–244 publications: 105 scientists 245–254 publications: 114 scientists 255–264 publications: 92 scientists 265–274 publications: 88 scientists 275–284 publications: 87 scientists 285–294 publications: 80 scientists 295–304 publications: 62 scientists 305–314 publications: 75 scientists 315–324 publications: 67 scientists 325–334 publications: 60 scientists 335–344 publications: 52 scientists 345–354 publications: 40 scientists 355–364 publications: 48 scientists 365–374 publications: 47 scientists 375–384 publications: 46 scientists 385–394 publications: 31 scientists 395–404 publications: 27 scientists 405–414 publications: 40 scientists 415–424 publications: 30 scientists 425–434 publications: 43 scientists 435–444 publications: 29 scientists 445–454 publications: 14 scientists 455–464 publications: 28 scientists 465–474 publications: 21 scientists 475–484 publications: 21 scientists 485–494 publications: 22 scientists 495–504 publications: 17 scientists 505–514 publications: 12 scientists 515–524 publications: 11 scientists 525–534 publications: 8 scientists 535–544 publications: 8 scientists 545–554 publications: 14 scientists 555–564 publications: 4 scientists 565–574 publications: 11 scientists 575–584 publications: 5 scientists 585–594 publications: 11 scientists 595–604 publications: 12 scientists 605–614 publications: 7 scientists 615–624 publications: 6 scientists 625–634 publications: 10 scientists 635–644 publications: 9 scientists 645–654 publications: 10 scientists 655–664 publications: 6 scientists 665–674 publications: 6 scientists 675–684 publications: 6 scientists 685–694 publications: 4 scientists 695–702 publications: 6 scientists 703+ publications: 100 scientists
45 publications 703+

This scientist: 170 publications — 39th percentile

39% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 703 publications or more.

Ichizo Kobayashi D-index placement in Genetics in 2026

The chart shows the D-index (discipline H-index) distribution of Genetics scientists ranked by Research.com in 2026. The highlighted bar marks where Ichizo Kobayashi sits on this spectrum.

40–41 D-Index: 24 scientists 42–43 D-Index: 52 scientists 44–45 D-Index: 84 scientists 46–47 D-Index: 112 scientists 48–49 D-Index: 118 scientists 50–51 D-Index: 141 scientists 52–53 D-Index: 143 scientists 54–55 D-Index: 145 scientists 56–57 D-Index: 179 scientists 58–59 D-Index: 162 scientists 60–61 D-Index: 175 scientists 62–63 D-Index: 191 scientists 64–65 D-Index: 172 scientists 66–67 D-Index: 184 scientists 68–69 D-Index: 164 scientists 70–71 D-Index: 158 scientists 72–73 D-Index: 150 scientists 74–75 D-Index: 136 scientists 76–77 D-Index: 127 scientists 78–79 D-Index: 127 scientists 80–81 D-Index: 111 scientists 82–83 D-Index: 110 scientists 84–85 D-Index: 110 scientists 86–87 D-Index: 84 scientists 88–89 D-Index: 102 scientists 90–91 D-Index: 66 scientists 92–93 D-Index: 72 scientists 94–95 D-Index: 70 scientists 96–97 D-Index: 54 scientists 98–99 D-Index: 60 scientists 100–101 D-Index: 49 scientists 102–103 D-Index: 55 scientists 104–105 D-Index: 45 scientists 106–107 D-Index: 42 scientists 108–109 D-Index: 28 scientists 110–111 D-Index: 39 scientists 112–113 D-Index: 25 scientists 114–115 D-Index: 31 scientists 116–117 D-Index: 29 scientists 118–119 D-Index: 34 scientists 120–121 D-Index: 29 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 18 scientists 126–127 D-Index: 27 scientists 128–129 D-Index: 22 scientists 130–131 D-Index: 16 scientists 132–133 D-Index: 11 scientists 134–135 D-Index: 17 scientists 136–137 D-Index: 12 scientists 138–139 D-Index: 21 scientists 140–141 D-Index: 4 scientists 142–143 D-Index: 9 scientists 144–145 D-Index: 14 scientists 146–147 D-Index: 6 scientists 148–149 D-Index: 10 scientists 150–151 D-Index: 7 scientists 152–153 D-Index: 9 scientists 154–155 D-Index: 8 scientists 156–157 D-Index: 8 scientists 158–159 D-Index: 9 scientists 160+ D-Index: 96 scientists
40 D-Index 160+

This scientist: 56 D-Index — 21st percentile

21% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 160 D-Index or more.

Overview

Ichizo Kobayashi is affiliated with the University of Tokyo in Japan. Their research primarily spans the fields of Medicine as well as Biochemistry, Genetics and Molecular Biology. Within these domains, Kobayashi has explored subfields including Surgery, Molecular Biology, Oncology, Genetics, and Epidemiology.

The scientist's work focuses on a range of topics with a notable emphasis on Helicobacter pylori-related gastroenterology studies. Other central areas of research include Inflammatory Bowel Disease, RNA modifications and cancer, Microscopic Colitis, Veterinary medicine and infectious diseases, Genomics and Phylogenetic Studies, and Bone health and treatments.

Ichizo Kobayashi has coauthored multiple publications with several frequent collaborators. These include Masaki Fukuyo, Koji Yahara, Kazunari Murakami, Hirokazu Yano, and Atsushi Toyoda.

Kobayashi's research has appeared repeatedly in a number of scientific publication venues. Among the most frequent are Microbial Genomics, Scientific Reports, Frontiers in Microbiology, DNA Research, and bioRxiv (Cold Spring Harbor Laboratory).

Their recent papers showcase the focus on Helicobacter pylori and related gastroenterological conditions as well as inflammatory diseases and microbiology. Notable publications include:

  • "Genome-wide association study of gastric cancer- and duodenal ulcer-derived Helicobacter pylori strains reveals discriminatory genetic variations and novel oncoprotein candidates" (2021, Microbial Genomics)
  • "Genomic differentiation within East Asian Helicobacter pylori" (2022, Microbial Genomics)
  • "Networking and Specificity-Changing DNA Methyltransferases in Helicobacter pylori" (2020, Frontiers in Microbiology)
  • "Elderly onset age is associated with low efficacy of first anti-tumor necrosis factor treatment in patients with inflammatory bowel disease" (2022, Scientific Reports)
  • "Gene content, phage cycle regulation model and prophage inactivation disclosed by prophage genomics in the Helicobacter pylori Genome Project" (2024, Gut Microbes)

Best Publications

  • Whole genome sequencing of meticillin-resistant Staphylococcus aureus

    Makoto Kuroda;Toshiko Ohta;Ikuo Uchiyama;Tadashi Baba

  • A nomenclature for restriction enzymes, DNA methyltransferases, homing endonucleases and their genes

    Richard J. Roberts;Marlene Belfort;Timothy Bestor;Ashok S. Bhagwat

  • Behavior of restriction–modification systems as selfish mobile elements and their impact on genome evolution

    Ichizo Kobayashi

  • Selfish behavior of restriction-modification systems

    Taku Naito;Kohji Kusano;Ichizo Kobayashi

  • To be or not to be: regulation of restriction–modification systems and other toxin–antitoxin systems

    Iwona Mruk;Ichizo Kobayashi

  • Identification in Methicillin-Susceptible Staphylococcus hominis of an Active Primordial Mobile Genetic Element for the Staphylococcal Cassette Chromosome mec of Methicillin-Resistant Staphylococcus aureus

    Yuki Katayama;Fumihiko Takeuchi;Teruyo Ito;Xiao Xue Ma

  • Evolution in an oncogenic bacterial species with extreme genome plasticity: Helicobacter pylori East Asian genomes

    Mikihiko Kawai;Mikihiko Kawai;Yoshikazu Furuta;Koji Yahara;Koji Yahara;Takeshi Tsuru

  • Shaping the genome--restriction-modification systems as mobile genetic elements.

    Ichizo Kobayashi;Ayaka Nobusato;Noriko Kobayashi-Takahashi;Ikuo Uchiyama

  • Restriction-modification systems as genomic parasites in competition for specific sequences

    Kohji Kusano;Taku Naito;Naofumi Handa;Ichizo Kobayashi

  • Discovery of a novel restriction endonuclease by genome comparison and application of a wheat-germ-based cell-free translation assay: PabI (5′-GTA/C) from the hyperthermophilic archaeon Pyrococcus abyssi

    Ken Ishikawa;Miki Watanabe;Toshihiro Kuroita;Ikuo Uchiyama

  • Restriction-modification gene complexes as selfish gene entities: Roles of a regulatory system in their establishment, maintenance, and apoptotic mutual exclusion

    Y. Nakayama;I. Kobayashi

  • Evidence for the double-strand break repair model of bacteriophage lambda recombination

    Noriko Takahashi;Ichizo Kobayashi

  • Genome comparison and context analysis reveals putative mobile forms of restriction–modification systems and related rearrangements

    Yoshikazu Furuta;Kentaro Abe;Ichizo Kobayashi

  • Methylome diversification through changes in DNA methyltransferase sequence specificity.

    Yoshikazu Furuta;Hiroe Namba-Fukuyo;Tomoko F. Shibata;Tomoaki Nishiyama

  • A DNA Methyltransferase Can Protect the Genome from Postdisturbance Attack by a Restriction-Modification Gene Complex

    Noriko Takahashi;Yasuhiro Naito;Naofumi Handa;Ichizo Kobayashi

  • Dependence of frequency of homologous recombination on the homology length.

    Y Fujitani;K Yamamoto;I Kobayashi

  • Cellular Responses to Postsegregational Killing by Restriction-Modification Genes

    Naofumi Handa;Asao Ichige;Kohji Kusano;Ichizo Kobayashi

  • Improved in vitro packaging of coliphage lambda DNA: a one-strain system free from endogenous phage

    Susan M. Rosenberg;Mary M. Stahl;Ichizo Kobayashi;Franklin W. Stahl

  • Diversity of restriction-modification gene homologues in Helicobacter pylori.

    Ayaka Nobusato;Ikuo Uchiyama;Ichizo Kobayashi

  • A nomenclature for restriction enzymes, DNA methyl transferases, homing endonucleases and their genes

    RJ Roberts;M Belford;T Bester;AS Bhagwat

Frequent Co-Authors

Masaru Tanokura
Masaru Tanokura University of Tokyo
Franklin W. Stahl
Franklin W. Stahl University of Oregon
Takeshi Azuma
Takeshi Azuma Kobe University
Sumio Sugano
Sumio Sugano University of Tokyo
Mitsuyasu Hasebe
Mitsuyasu Hasebe The Graduate University for Advanced Studies, SOKENDAI
Masahira Hattori
Masahira Hattori Waseda University
Yutaka Suzuki
Yutaka Suzuki University of Tokyo
Shuji Shigenobu
Shuji Shigenobu National Institute for Basic Biology
Kenshiro Oshima
Kenshiro Oshima University of Tokyo

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