Table 2.
Numbers and chromosomal positions of U1 and U2 snRNA and H3 loci per haploid genome in diploid X. tropicalis (subgenus Silurana) and reduced genome (half of the somatic set) in allotetraploid X. calcaratus (subgenus Silurana), X. pygmaeus, X. allofraseri (both in the amieti species group), X. laevis (laevis species group), and X. muelleri (muelleri species group). The numbers of loci are given according to the FISH results and the genomic database. The XTR, XCA, XPY, XAL, XLA, and XMU abbreviations correspond to chromosome of X. tropicalis, X. calcaratus, X. pygmaeus, X. allofraseri, X. laevis, and X. muelleri, respectively. NA means that information is not available in the genome database
| Species | Number of chromosomes | U1 snRNA by FISH | U1 snRNA genomic database | U2 snRNA revealed by FISH | U2 snRNA genomic database | H3 by FISH | H3 genomic database |
|---|---|---|---|---|---|---|---|
| X. tropicalis | n = 10 | 1 (XTR 1) | 1 (XTR 1) | 1 (XTR 8) | 1 (XTR 8) | 10 | 6 |
| X. calcaratus | n = 20 | 2 (XCA 1a and 1b) | NA | 2 (XCA 8a and 8b) | NA | 20 | NA |
| X. pygmaeus | n = 18 | 1 (XPY 1L) | NA | 1 (XPY 8S) | NA | 8 | NA |
| X. allofraseri | n = 18 | 1 (XAL 1L) | NA | 1 (XAL 8S) | NA | 8 | NA |
| X. laevis | n = 18 | 1 (XLA 1S) | 2 (XLA 1L, XLA 1S) | 1 (XLA 8L) | 2 (XLA 8L, XLA 8S) | 8 | 9 |
| X. muelleri | n = 18 | 2 (XMU 1L and 1S) | NA | 2 (XMU 8L and 8S) | NA | 18 | NA |