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[Evolution of the phosphofructokinase gene introne in gastropods of family Baicaliidae].

One of the intrones of the phosphofructokinase gene has been sequenced in seven species of endemic Baikalian gastropods of family Baicaliidae. The length of this introne differs even between sister species. Along with relatively few nucleotide substitutions numerous deletions and insertions accumulated. The number of deletions/insertions does not correlate to genetic distance between the species as estimated by comparing sequences of a mitochondrial fragment. Deduced tertiary structure differs markedly even between sister taxa although there is a consensus motif. Long RNA stems appearing and disappearing in course of evolution may contain regulatory RNAs and therefore the evolution of the introne may be non-neutral.