Genome-based reclassification of Alkalispirochaeta sphaeroplastigenens (Vishnuvardhan Reddy et al. 2013) Sravanthi et al. 2016 as a later heterotypic synonym of Alkalispirochaeta alkalica (Zhilina et al. 1996) Sravanthi et al. 2016.

Authors

Michaela M Scranton, Richard W McLaughlin, Mostafa S Elshahed, Paul A Lawson, Samuel L Miller

Published in

International journal of systematic and evolutionary microbiology. Volume 76. Issue 6.

Abstract

An initial comparison of 16S rRNA gene sequences between Alkalispirochaeta alkalica Z-7491^T and other members of the genus Alkalispirochaeta revealed ≥99.4% sequence similarity, suggesting their close relatedness and the possibility that some members are in fact the same species. The genus Alkalispirochaeta includes five species with validly published names. A. alkalica Z-7491^T (=ATCC 700262^T=DSM 8900^T) and Alkalispirochaeta sphaeroplastigenens JC133^T (=KCTC 15220^T=NBRC 109056^T) were both isolated from alkaline lakes (Lake Magadi in Kenya and Lonar Lake in India), respectively. The present study used whole-genome data to clarify the taxonomic assignment of these two closely related Alkalispirochaeta species. A. alkalica Z-7491^T and A. sphaeroplastigenens JC133^T share similar phenotypic and chemotaxonomic characteristics. They are Gram-stain-negative, motile, helical-shaped bacteria that require sodium for growth and grow optimally under alkaliphilic and mesophilic conditions, and their main cellular fatty acid is C_18 : 1 ω7c. Overall genomic relatedness indices analyses indicated average nucleotide identity and digital DNA-DNA hybridization values >95.0% and >70.0%, respectively. These values exceed thresholds currently accepted for bacterial species delineation. Further, these taxa cluster together within the genus Alkalispirochaeta in both the 16S rRNA gene phylogenetic tree and the core-genome phylogenomic tree. Based on the combined evidence and the earliest validly published names, priority is given to Alkalispirochaeta alkalica (Zhilina et al. 1996) Sravanthi et al. 2016. Alkalispirochaeta sphaeroplastigenens (Vishnuvardhan Reddy et al. 2013) Sravanthi et al. 2016 is proposed to be a later heterotypic synonym of Alkalispirochaeta alkalica (Zhilina et al. 1996) Sravanthi et al. 2016.

PMID:
42329692
Bibliographic data and abstract were imported from PubMed on 22 Jun 2026.

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