Bio


I am a geneticist who works in the field of marine science and conservation. My work is aimed at reducing knowledge gaps in conservation science through scientific research, community partnerships and knowledge exchange across disciplines. Genomics research by our group aims to inform conservation policy and assist in reducing illegal wildlife trade.

Boards, Advisory Committees, Professional Organizations


  • Diversity and Inclusion Officer, Society for Conservation Biology-Marine Section (2019 - Present)

Professional Education


  • Master of Science, Maharaja Sayajirao University Baroda (2005)
  • Bachelor of Science, Gujarat University (2004)
  • Doctor of Philosophy, University of Utah, Genetics (2015)

Stanford Advisors


All Publications


  • Taking Advantage of the Genomics Revolution for Monitoring and Conservation of Chondrichthyan Populations DIVERSITY-BASEL Johri, S., Doane, M. P., Allen, L., Dinsdale, E. A. 2019; 11 (4)

    View details for DOI 10.3390/d11040049

    View details for Web of Science ID 000467289800002

  • 'Genome skimming' with the MinION hand-held sequencer identifies CITES-listed shark species in India's exports market SCIENTIFIC REPORTS Johri, S., Solanki, J., Cantu, V., Fellows, S. R., Edwards, R. A., Moreno, I., Vyas, A., Dinsdale, E. A. 2019; 9: 4476

    Abstract

    Chondrichthyes - sharks, rays, skates, and chimeras, are among the most threatened and data deficient vertebrate species. Global demand for shark and ray derived products, drives unregulated and exploitative fishing practices, which are in turn facilitated by the lack of ecological data required for effective conservation of these species. Here, we describe a Next Generation Sequencing method (using the MinION, a hand-held portable sequencing device from Oxford Nanopore Technologies), and analyses pipeline for molecular ecological studies in Chondrichthyes. Using this method, the complete mitochondrial genome and nuclear intergenic and protein-coding sequences were obtained by direct sequencing of genomic DNA obtained from shark fin tissue. Recovered loci include mitochondrial barcode sequences- Cytochrome oxidase I, NADH2, 16S rRNA and 12S rRNA- and nuclear genetic loci such as 5.8S rRNA, Internal Transcribed Spacer 2, and 28S rRNA regions, which are commonly used for taxonomic identification. Other loci recovered were the nuclear protein-coding genes for antithrombin or SerpinC, Immunoglobulin lambda light chain, Preprogehrelin, selenium binding protein 1(SBP1), Interleukin-1 beta (IL-1β) and Recombination-Activating Gene 1 (RAG1). The median coverage across all genetic loci was 20x and sequence accuracy was ≥99.8% compared to reference sequences. Analyses of the nuclear ITS2 region and the mitochondrial protein-encoding loci allowed accurate taxonomic identification of the shark specimen as Carcharhinus falciformis, a CITES Appendix II species. MinION sequencing provided 1,152,211 bp of new shark genome, increasing the number of sequenced shark genomes to five. Phylogenetic analyses using both mitochondrial and nuclear loci provided evidence that Prionace glauca is nested within Carcharhinus, suggesting the need for taxonomic reassignment of P. glauca. We increased genomic information about a shark species for ecological and population genetic studies, enabled accurate identification of the shark tissue for biodiversity indexing and resolved phylogenetic relationships among multiple taxa. The method was independent of amplification bias, and adaptable for field assessments of other Chondrichthyes and wildlife species in the future.

    View details for DOI 10.1038/s41598-019-40940-9

    View details for Web of Science ID 000461151800060

    View details for PubMedID 30872700

    View details for PubMedCentralID PMC6418218

  • Mitochondrial genome of the Smoothnose wedgefish Rhynchobatus laevis from the Western Indian Ocean MITOCHONDRIAL DNA PART B-RESOURCES Johri, S., Tiwari, A., Kerr, E. N., Dinsdale, E. A. 2020; 5 (3): 2083–84
  • Mitochondrial genome of the Silvertip shark, Carcharhinus albimarginatus, from the British Indian Ocean Territory MITOCHONDRIAL DNA PART B-RESOURCES Johri, S., Dunn, N., Chapple, T. K., Curnick, D., Savolainen, V., Dinsdale, E. A., Block, B. A. 2020; 5 (3): 2085–86
  • Complete mitochondrial genome of the gray reef shark, Carcharhinus amblyrhynchos (Carcharhiniformes: Carcharhinidae) MITOCHONDRIAL DNA PART B-RESOURCES Dunn, N., Johri, S., Curnick, D., Carbone, C., Dinsdale, E. A., Chapple, T. K., Block, B. A., Savolainen, V. 2020; 5 (3): 2080–82
  • Mitochondrial genome to aid species delimitation and effective conservation of the Sharpnose Guitarfish (Glaucostegus granulatus) META GENE Johri, S., Fellows, S. R., Solanki, J., Busch, A., Livingston, I., Mora, M., Tiwari, A., Cantu, V., Goodman, A., Morris, M. M., Doane, M. P., Edwards, R. A., Dinsdale, E. A. 2020; 24