TY - JOUR

T1 - Reclassification of [haemophilus] haemoglobinophilus as canicola haemoglobinophilus gen. Nov., comb. nov. including bisgaard taxon 35

AU - Christensen, Henrik

AU - Kuhnert, Peter

AU - Foster, Geoffrey

AU - Bisgaard, Magne

N1 - Publisher Copyright: © 2021 The Authors.

PY - 2021

Y1 - 2021

N2 - [Haemophilus] haemoglobinophilus and the unpublished Bisgaard taxon 35 are associated with respiratory and urogenital tract infections in dogs. A total of 21 strains including the type strain of [Haemophilus] haemoglobinophilus were included in the inves-tigation. Strains of [Haemophilus] haemoglobinophilus and taxon 35 formed a monophyletic group demonstrating at least 97.8 and 96.5% similarities within the group based upon 16S rRNA and rpoB gene sequence comparisons, respectively. Glaesserella australis was the most closely related species to [Haemophilus] haemoglobinophilus and taxon 35 with 96.1% 16S rRNA gene sequence similarity which is slightly higher than the 95% separating most genera of the family Pasteurellaceae. However, the conserved protein sequence phylogeny documented a unique position of [Haemophilus] haemoglobinophilus with only 81% identity to the most closely related species, genomospecies 1 of the genus Rodentibacter which is lower than the 85% separating most genera of the family Pasteurellaceae. The conserved protein sequence identity to Haemophilus influenzae, the type species of the genus, was 77%, demonstrating that [Haemophilus] haemoglobinophilus is not properly classified as a member of the genus Haemophilus. On the basis of the phylogenetic comparisons, the taxa [Haemophilus] haemoglobinophilus and taxon 35 are proposed to be included with a novel genus Canicola with one species, Canicola haemoglobinophilus which is reclassified from [Haemophilus] haemoglobinophilus. Phenotypic characters obtained with isolates genetically approved to represent Cani-cola haemoglobinophilus were in accordance with those of the members of the family Pasteurellaceae, and the novel genus can be separated from most of the existing genera by a positive catalase reaction, lack of V-factor requirement for growth, lack of haemolysis of blood agar and negative Voges–Proskauer and urease tests. The novel genus cannot be separated by biochemical and physiological characteristics alone from the genera Aggregatibacter, Avibacterium, Frederiksenia and Spirabiliibacterium. However, MALDI-TOF mass spectroscopy and also RpoB amino acid signatures allowed a clear separation from these taxa, supporting the existence of a novel genus. The DNA G+C content is 37.0–37.8 mol% for the genus, based on the whole genomic sequences. The type strain of Canicola haemoglobinophilus is CCUG 3714T (=ATCC 19416T=NCTC 1659T) isolated in 1901 from the prepuce of a dog in Germany.

AB - [Haemophilus] haemoglobinophilus and the unpublished Bisgaard taxon 35 are associated with respiratory and urogenital tract infections in dogs. A total of 21 strains including the type strain of [Haemophilus] haemoglobinophilus were included in the inves-tigation. Strains of [Haemophilus] haemoglobinophilus and taxon 35 formed a monophyletic group demonstrating at least 97.8 and 96.5% similarities within the group based upon 16S rRNA and rpoB gene sequence comparisons, respectively. Glaesserella australis was the most closely related species to [Haemophilus] haemoglobinophilus and taxon 35 with 96.1% 16S rRNA gene sequence similarity which is slightly higher than the 95% separating most genera of the family Pasteurellaceae. However, the conserved protein sequence phylogeny documented a unique position of [Haemophilus] haemoglobinophilus with only 81% identity to the most closely related species, genomospecies 1 of the genus Rodentibacter which is lower than the 85% separating most genera of the family Pasteurellaceae. The conserved protein sequence identity to Haemophilus influenzae, the type species of the genus, was 77%, demonstrating that [Haemophilus] haemoglobinophilus is not properly classified as a member of the genus Haemophilus. On the basis of the phylogenetic comparisons, the taxa [Haemophilus] haemoglobinophilus and taxon 35 are proposed to be included with a novel genus Canicola with one species, Canicola haemoglobinophilus which is reclassified from [Haemophilus] haemoglobinophilus. Phenotypic characters obtained with isolates genetically approved to represent Cani-cola haemoglobinophilus were in accordance with those of the members of the family Pasteurellaceae, and the novel genus can be separated from most of the existing genera by a positive catalase reaction, lack of V-factor requirement for growth, lack of haemolysis of blood agar and negative Voges–Proskauer and urease tests. The novel genus cannot be separated by biochemical and physiological characteristics alone from the genera Aggregatibacter, Avibacterium, Frederiksenia and Spirabiliibacterium. However, MALDI-TOF mass spectroscopy and also RpoB amino acid signatures allowed a clear separation from these taxa, supporting the existence of a novel genus. The DNA G+C content is 37.0–37.8 mol% for the genus, based on the whole genomic sequences. The type strain of Canicola haemoglobinophilus is CCUG 3714T (=ATCC 19416T=NCTC 1659T) isolated in 1901 from the prepuce of a dog in Germany.

KW - EF 32

KW - Haemin

KW - Haemorrhagic pneumonia

KW - Porphyrin

KW - Prostate inflammation

KW - U24 of Biberstein

U2 - 10.1099/ijsem.0.004881

DO - 10.1099/ijsem.0.004881

M3 - Journal article

C2 - 34264807

AN - SCOPUS:85110088276

VL - 71

JO - International Journal of Systematic and Evolutionary Microbiology

JF - International Journal of Systematic and Evolutionary Microbiology

SN - 1466-5026

IS - 7

M1 - 004881

ER -