Cobalamin neuropathy. Is S-adenosylhomocysteine toxicity a factor?

Cobalamin neuropathy was produced in cape fruit bats (Rousettus aegyptiacus) by a cobalamin-free diet combined with intermittent exposure to nitrous oxide, which inactivates cobalamin. There were no significant differences in S-adenosylmethionine/S-adenosylhomocysteine ratios in the central nervous system of cobalamin-deficient and cobalamin-replete bats. Taken with other data there are no grounds of support for a hypothesis that cobalamin neuropathy is the result of impaired methylation, however produced.