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Table 4 Effect of mutY on the GC content of ribosomal RNA genes in Calyptogena clam symbionts

From: Loss of genes for DNA recombination and repair in the reductive genome evolution of thioautotrophic symbionts of Calyptogena clams

Host clam Clade mutY 16S rDNA 23S rDNA
    Length (bp) G+C% Length (bp) G+C%
Calyptogena kilmeri I - 1428 48.79 2519 48.14
C. kawamurai I - 1510 48.77 2519 47.94
C. soyoae I - 1508 48.77 2525 48.13
C. laubieri I - 1343 48.65 2519 48.25
C. okutanii I - 1468 48.87 2525 48.12
C. magnifica II - 1468 50.20 2536 48.94
Mean I + Rma*    49.01#   48.25§
SD     0.59   0.35
Mean I only    48.77$   48.12!
SD     0.08   0.11
C. phaseoliformis II + 1506 50.41 2530 49.81
C. fossajaponica II + 1467 50.64 2531 49.99
C. stearnsii II + 1467 49.90 2535 49.07
C. nautilei II + 1506 49.90 2528 49.36
C. fausta II + 1507 50.13 2534 49.31
C. pacifica II + 1428 50.27 2532 49.25
Mean II except Rma*    50.21#$   49.47§!
SD     0.29   0.36
  1. *Ca. Ruthia magnifica (symbiont of C. magnifica)
  2. #Difference between G+C contents of 16S rRNA genes of clade I symbionts+Rma and of clade II symbionts except Rma was significant (p = 0.00119) in the t-test.
  3. $Difference between G+C contents of 16S rRNA genes of clade I symbionts and of clade II symbionts except Rma (p = 0.00257) was significant in Welch's test.
  4. §Differences between G+C contents of 23S rRNA genes of clade I symbionts+Rma and of clade II symbionts (p = 0.00014) was significant in the t-test.
  5. !Difference between G+C contents of 23S rRNA genes of clade I symbionts and of clade II symbionts (p = 2.014e-5) was significant in the t-test.