Characteristics and Phylogeny of Shewanella haliotis Isolated from Cultivated Shellfish in Taiwan

Characterization of CRISPR-Cas Systems in Shewanella algae and Shewanella haliotis: Insights into the Adaptation and Survival of Marine Pathogens

CRISPR-Cas systems are adaptive immune mechanisms present in most prokaryotes that play an important role in the adaptation of bacteria and archaea to new environments. Shewanella algae is a marine zoonotic pathogen with worldwide distribution, which accounts for the majority of clinical cases of Shewanella infections. However, the characterization of Shewanella algae CRISPR-Cas systems has not been well investigated yet. Through whole genome sequence analysis, we characterized the CRISPR-Cas systems in S. algae. Our results indicate that CRISPR-Cas systems are prevalent in S. algae, with the majority of strains containing the Type I-F system. This study provides new insights into the diversity and function of CRISPR-Cas systems in S. algae and highlights their potential role in the adaptation and survival of these marine pathogens.

Genome Sequence of Colistin-Resistant Bacteremic Shewanella algae Carrying the Beta-Lactamase Gene bla OXA-55

Shewanella algae is an emerging pathogen widely distributed in aquatic environment. Bacteremia is a major manifestation of S. algae infections, and there are increasing reports of antibiotic-resistant strains. However, little is known about the genomic characteristics of human bacteremic S. algae. Here, we report the results of the whole-genome sequencing of colistin-resistant S. algae TYL, a blood isolate. Chromosome-encoded pmrC associated with colistin resistance and bla_OXA-55 gene intrinsic to S. algae was identified. Continuous surveillance for the emergence of S. algae is needed.

Genomic and phylogenetic characterization of Shewanella xiamenensis isolated from giant grouper (Epinephelus lanceolatus) in Taiwan

Shewanella xiamenensis is an emerging pathogen causing intra-abdominal infection and intestinal colonization. Epidemiologic clues suggest its role as a potential food-borne zoonotic agent. To date, four genome sequences of S. xiamenensis have been made publicly available. All of them were isolated from water samples. In this study, we characterized the genome of a S. xiamenensis strain isolated from a giant grouper in Taiwan. The genome of S. xiamenensis ZYW1 is 4,827,717 bp in length and encodes 4,239 open reading frames. Its genomic sequence shares high homology with other S. xiamenensis strains. bla_OXA-416 was identified. This is the first detection of S. xiamenensis in Taiwan. These genomic data and analyses contribute to our understanding of S. xiamenensis and may help to elucidate disease-causing mechanisms in future studies.

Whole-genome characterization of Shewanella algae strain SYT3 isolated from seawater reveals insight into hemolysis

AIM

To describe the genomic characteristics of seawater-borne hemolytic Shewanella algae and its resistance genes.

MATERIALS & METHODS

Whole genome sequence of S. algae SYT3 was determined using llumina MiSeq platform. Multiple-database-based analysis was performed to identify the genetic background of its hemolytic activity and the antibiotic resistance genes.

RESULTS

S. algae SYT3 possesses a homolog of the hly operon involved in the synthesis of hemolysin. We also identified candidate genes associated with resistance to β-lactam antibiotics (bla _OXA-55) and fluoroquinolone (qnrA3).

CONCLUSION

The study provides an insight into the hemolytic activity of S. algae. Our findings also suggested S. algae as a potential reservoir of antimicrobial resistance determinants.