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Alistipes onderdonkii sp. nov. and Alistipes shahii sp. nov., of human origin

Yuli Song¹, Eija Könönen², Merja Rautio^2,, Chengxu Liu¹, Anne Bryk², Erkki Eerola³ and Sydney M. Finegold^4,5,6

¹ Research Service, VA Medical Center West Los Angeles, Building 304, Room E3-227, 11301 Wilshire Boulevard, Los Angeles, CA 90073, USA
² Anaerobe Reference Laboratory, National Public Health Institute (KTL), Helsinki, Finland
³ Department of Medical Microbiology, University of Turku, Turku, Finland
⁴ Infectious Diseases Section, VA Medical Center West Los Angeles, Los Angeles, CA 90073, USA
⁵ Department of Medicine, UCLA School of Medicine, Los Angeles, CA, USA
⁶ Department of Microbiology, Immunology, and Molecular Genetics, UCLA School of Medicine, Los Angeles, CA, USA

Correspondence
Yuli Song
yulis1{at}yahoo.com

Two groups of previously unknown Gram-negative, strictly anaerobic, pigment-producing, rod-shaped bacteria, which phenotypically and phylogenetically displayed a close association with the recently described species Alistipes finegoldii, were characterized using phenotypic and molecular taxonomic methods. A 16S rRNA gene sequence divergence of approximately 3 % between the two unknown bacteria and A. finegoldii, as well as distinguishable biochemical characteristics, demonstrates that these organisms are genotypically and phenotypically distinct and that each group represents a previously unknown subline within the genus Alistipes. Chromosomal DNA–DNA reassociation studies further confirmed the separateness of the unidentified bacteria and A. finegoldii. On the basis of the phenotypic and phylogenetic findings, two novel species, Alistipes onderdonkii sp. nov. and Alistipes shahii sp. nov., are proposed. The type strains of A. onderdonkii and A. shahii are WAL 8169^T (=CCUG 48946^T=ATCC BAA-1178^T) and WAL 8301^T (=CCUG 48947^T=ATCC BAA-1179^T), respectively; their DNA G+C contents are 58 and 56 mol%, respectively.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains WAL 8169^T and WAL 8301^T are AY974071 and AY974072, respectively.

The cellular fatty acid compositions of representative novel strains described in this work are presented in a supplementary table available in IJSEM Online.

Present address: Helsinki University Central Hospital Laboratory Services (HUSLAB), Helsinki, Finland.