Genus: Sogarnavirus

Genus: Sogarnavirus

Distinguishing features

Members of the genus form a separate clade from other members of the family upon phylogenetic analysis of RNA-directed RNA polymerase amino acid sequences.

Virion

Morphology

The structures of the capsid proteins and virion have been characterized for the virus Chaetoceros tenuissimus RNA virus type II (CtenRNAVII, species Chaetenuissarnavirus II) (Figure 1.Marnaviridae) (Munke et al., 2020). The VP1 protein has a unique surface loop that has not been previously observed in related invertebrate and vertebrate viruses. The characteristic VP1 “canyon” feature is obscured by another VP1 loop of the same protein and the VP2 protein has an N-terminal tail. 

Genome organization and replication

The current members have di-cistronic genomes (Figure 2.Marnaviridae). See discussion under family description.

Biology

See discussion under family description.

Species demarcation criteria

Species demarcation cut-offs are based on pairwise comparisons of the RdRP and capsid amino acid sequences. The cut-offs are 90% identity for the RdRP and 75% identity for the capsid. The phylogenetic relationship of classified virus isolates and numerous unclassified viruses is shown in Figrue 1.Sogarnavirus.

Figrue 1.Sogarnavirus. Maximum likelihood tree of sogarnavirus RdRP amino sequences. The tree was produced using the JTT model with a gamma distribution of frequencies and invariant sites. Bootstrap values are shown where they were over 70%. Tips are labelled with filled circles for members of species; open circles represent unclassified viruses. Heterosigma akashiwo RNA virus (AY337486) was used as an outgroup. This phylogenetic tree and corresponding sequence alignment are available to download from the Resources page.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Britarnavirus 2Marine RNA virus BC-2MG584188NC_043542Complete coding genomeBC-2
Britarnavirus 3Marine RNA virus BC-3MG584189NC_043543Partial genomeBC-3
Chaetarnavirus 2Chaetoceros species RNA virus 02Csp02RNAV01AB639040Complete coding genomeCspRNAV2
Chaetenuissarnavirus IIChaetoceros tenuissimus RNA virus type IISS10-16VAB971661NC_025889Complete coding genomeCtenRNAVII
Jericarnavirus AMarine RNA virus JP-AEF198241NC_009757Complete genomeJP-A
Palmarnavirus 156Marine RNA virus PAL156KT727024NC_029307Complete coding genomePAL156

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.

Related, unclassified viruses

Virus name

Accession number

Antarctic picorna-like virus 2

KM259870

Beihai picorna-like virus 1 strain BHTSS18000

KX883421

Beihai picorna-like virus 1 strain BHNXC41230

KX883392

Beihai picorna-like virus 1 strain BHBJDX18697

KX883332

Beihai picorna-like virus 1 strain BHZC36988

KX884481

Beihai picorna-like virus 1 strain SCJXSX39332

KX883964

Beihai picorna-like virus 1 strain BHJJX25883

KX883371

Beihai picorna-like virus 4

KX884510

Beihai picorna-like virus 5

KX883398

Beihai picorna-like virus 7

KX883403

Beihai picorna-like virus 6 strain BHNXC41284

KX883393

Beihai picorna-like virus 6 strain BHZC37373

KX884492

Beihai picorna-like virus 9

KX883336

Beihai picorna-like virus 8

KX883401

Beihai picorna-like virus 11

KX884519

Beihai picorna-like virus 13

KX884497

Beihai picorna-like virus 14

KX883348

Beihai picorna-like virus 15 strain BZL81977

KX884533

Beihai picorna-like virus 15 strain BHZY59344

KX884506

Beihai picorna-like virus 15 strain BHXun32793

KX884474

Beihai picorna-like virus 15 strain BHZC36638

KX884479

Beihai picorna-like virus 15 strain BHXG24735

KX884464

Beihai picorna-like virus 15 strain YYSZX17489

KX884387

Beihai picorna-like virus 15 strain HWRTX12823

KX883908

Beihai picorna-like virus 15 strain BHTSS17870

KX883418

Beihai picorna-like virus 15 strain BHWZXX15642

KX883431

Beihai picorna-like virus 15 strain BHNXC41227

KX883391

Beihai picorna-like virus 15 strain BHJJX25823

KX883370

Beihai picorna-like virus 15 strain BHBJDX18577

KX883330

Beihai picorna-like virus 15 strain BWBFG37850

KX884524

Beihai picorna-like virus 15 strain BHCL77416

KX883339

Wenzhou picorna-like virus 1

KX884370

Wenzhou picorna-like virus 2 strain beimix73672

KX883299

Wenzhou picorna-like virus 2 strain WZSBei58345

KX884353

Wenzhou picorna-like virus 50

KX884367

Wenzhou picorna-like virus 52

KX883300

Virus names and virus abbreviations are not official ICTV designations.