Abstract -- Among progeny of a hybrid (Rana shqiperica x Rana lessonae) x Rana
lessonae, 14 of 22 loci form four linkage groups (LGs): (1) mitochondrial
aspartate aminotransferase, carbonate dehydratase-2, esterase 4, peptidase
D; (2) mannosephosphate isomerase, lactate dehydrogenase-B, sex,
hexokinase-1, peptidase B; (3) albumin, fructose-biphosphatase-1, guanine
deaminase; (4) mitochondrial superoxide dismutase, cytosolic malic enzyme,
xanthine oxidase. Fructose-biphosphate aldolase-2 and cytosolic aspartate
aminotransferase possibly form a fifth LG. Mitochondrial aconitate
hydratase, a-glucosidase, glyceraldehyde-3-phosphate dehydrogenase,
phosphogluconate dehydrogenase, and phosphogluco-mutase-2 are unlinked to
other loci. All testable linkages (among eight loci of LGs 1, 2, 3, and 4)
are shared with eastern Palearctic water frogs. Including published data,
44 protein loci can be assigned to 10 of the 13 chromosomes in Holarctic
Rana. Of testable pairs among 18 protein loci, agreement between Palearctic
and Nearctic Rana is complete (125 unlinked, 14 linked pairs among 14 loci
of five syntenies), and Holarctic Rana and Xenopus laevis are highly
concordant (125 shared nonlinkages, 13 shared linkages, 3 differences).
Several Rana syntenies occur in mammals and fish. Many syntenies apparently
have persisted for 60-140x10^6 years (frogs), some even for 350-400x10^6
years (mammals and teleosts).
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