Abstract
Liver tissues from rainbow (Salmo gairdneri) and brown (S. trutta) trout chronically exposed to waters with naturally high selenium levels accumulate significant amounts of the element, with values in the 50–70 μg/g range (fresh tissue) not unusual. This accumulation appears to increase with time since older fish from the same waters invariably contain higher liver selenium levels. Studies in other systems suggested that there might be gross alterations in cellular macromolecular methylations in fish chronically exposed to elevated selenium levels. Mature tRNAs isolated from trout livers having both low and high selenium levels, however, showed no differences in their methyl-accepting abilities in a homologous in vitro methylating system. In addition, direct nucleoside analyses on these different tRNA samples showed similar levels of base methylation, with no evidence for methylation abberations. The nucleoside analyses on the tRNAs were similar and in keeping with values reported for other eukaryotic systems. Key words: selenium, biological methylation, methylation, transfer RNA, nucleoside analysis, Salmo gairdneri, S. trutta
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