Genomic insight into Chryseobacterium turcicum sp. nov. and Chryseobacterium muglaense sp. nov. isolated from farmed rainbow trout in Turkey


Saticioglu I. B., Ay H., ALTUN S., DUMAN M.

SYSTEMATIC AND APPLIED MICROBIOLOGY, vol.46, no.1, 2023 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 1
  • Publication Date: 2023
  • Doi Number: 10.1016/j.syapm.2022.126385
  • Journal Name: SYSTEMATIC AND APPLIED MICROBIOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Agricultural & Environmental Science Database, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, EMBASE, Environment Index, Food Science & Technology Abstracts, MEDLINE, Veterinary Science Database
  • Keywords: Chryseobacterium, Rainbow trout, Oncorhynchus mykiss, Aquaculture, Antimicrobial resistance genes, PHYLOGENETIC TREES, BACTERIA, DATABASE, VERSION
  • Bursa Uludag University Affiliated: Yes

Abstract

Four strains, designated as C-2, C-17T, C-39T and Ch-15, were isolated from farmed rainbow trout samples showing clinical signs during an investigation for a fish-health screening study. The pairwise 16S rRNA gene sequence analysis showed that strain C-17T shared the highest identity level of 98.1 % with the type strain of Chryseobacterium piscium LMG 23089T while strains C-2, C-39T and Ch-15 were closely related to Chryseobacterium balustinum DSM 16775T with an identity level of 99.3 %. A polyphasic approach involving phenotypic, chemotaxonomic and genome-based analyses was employed to determine the taxonomic prove-nance of the strains. The overall genome relatedness indices including dDDH and ANI analyses confirmed that strains C-2, C-17T, C-39T and Ch-15 formed two novel species within the genus Chryseobacterium. Chemotaxonomic analyses showed that strains C-17T and C-39T have typical characteristics of the genus Chryseobacterium by having phosphatidylethanolamine in their polar lipid profile, MK-6 as only isoprenoid qui -none and the presence of iso-C15:0 as major fatty acid. The genome size and G + C content of the strains ranged between 4.4 and 5.0 Mb and 33.5 - 33.6 %, respectively. Comprehensive genome analyses revealed that the strains have antimicrobial resistance genes, prophages and horizontally acquired genes in addition to sec-ondary metabolite-coding gene clusters. In conclusion, based on the polyphasic analyses conducted on the pre-sent study, strains C-17T and C-39T are representatives of two novel species within the genus Chryseobacterium, for which the names Chryseobacterium turcicum sp. nov. and Chryseobacterium muglaense sp. nov. with the type strains C-17T (=JCM 34190T = KCTC 82250T) and C-39T (=JCM 34191T = KCTC 822251T), respectively, are proposed.