Table 4.
Effect of mutY on the GC content of ribosomal RNA genes in Calyptogena clam symbionts
| 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 | ||||
*Ca. Ruthia magnifica (symbiont of C. magnifica)
#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.
$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.
§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.
!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.