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Table 1 General genome features of the S. velum symbiont in comparison to other γ-proteobacteria

From: The genome of the intracellular bacterium of the coastal bivalve, Solemya velum: a blueprint for thriving in and out of symbiosis

 

Solemya velum endosymbiont

Riftia pachyptila endosymbiont*

Calyptogena magnifica endosymbiont

Calyptogena okutanii endosymbiont

Buchnera aphidicola APS

Ca.Carsonella ruddii PV

Thiomicrospira crunogena XCL-2

Allochromatium vinosum DSM 180

Escherichia coli K12 DH1, ATCC 33849

Size, mb

2.70

3.20

1.20

1.02

0.65

0.16

2.40

3.60

4.63

G + C%

51.0

57.9

34.0

31.6

26.4

16.6

43.1

64.3

50.8

ORFs

2757

4182

1118

981

615

213

2263

3317

4273

Average ORF length, bp

885

354

874

897

935

737

974

1005

940

Percent coding

90.7

69.8

79.8

85.9

87.6

97.3

90.5

90.6

86.6

rRNA operons (16S-23S-5S)

1

1

1

1

1

1

3

3

7

tRNA genes

38

32

36

36

32

28

43

51

88

Proteins with predicted function

1988

2218

932

838

561

113

1785

2505

3506

Hypothetical and uncharacterized conserved proteins

769

3693

175

253

106

46

689

924

833

ORFs in paralogous families

382

292

27

19

7

0

159

413

794

Pseudogenes

0

0

100

2

1

0

8

81

178

Sigma factors

9

4

2

2

2

0

6

6

7

Mobile elements

78

10

0

0

0

0

10

19

39

 

Symbiont

Symbiont

Symbiont

Symbiont

Symbiont

Symbiont

Free-living

Free-living

Free-living

  1. The comparison includes genomes of the chemosynthetic symbionts of R. pahyptila, C. magnifica, and C. okutanii; a symbiont of psyllids (the smallest sequenced genome), Carsonella ruddii; an α-proteobacterial aphid symbiont, B. aphidicola; free-living sulfur-oxidizers, T. crunogena and A. vinosum, and enterobacterium E. coli. *NCBI Accession PRJNA16744 and PRJNA72967.