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Flies offer clues to anesthesia-resistant memory

A fruit fly gene called radish, and the newly identified protein it encodes, have opened doors to understanding the genes and neuronal networks that govern a special type of memory, termed anesthesia-resistant memory. Researchers had previously known that for most animals -- not just humans -- loss of consciousness from anesthesia causes amnesia for recently experienced events. In contrast, for reasons that are not well understood, older memories are resistant to the effects of anesthesia. With the help of model organisms such as Drosophila, different types of memory are also now beginning to be identified on the basis of genetic requirements. This week, new analysis of a fly gene required for anesthesia-resistant memory sheds light on the nature of this memory type, and what makes it different from other kinds of stable memories.

The new work, reported by Josh Dubnau and colleagues at Cold Spring Harbor Laboratory in New York, was based on some well established observations regarding learning and memory in the fruit fly. In Drosophila, memory of an odor-electric shock association is at first easily erased by anesthesia-induced loss of consciousness. Within the first hour after this memory forms, however, it becomes more resistant to anesthesia. For over a decade, memory researchers have known that this form of memory, anesthesia-resistant memory, does not form in a mutant strain of flies bearing a mutation in the gene called radish. Until now, however, the molecular basis for the radish memory defect has been a mystery.

Dubnau and colleagues have now identified the radish gene, and shown that it encodes a protein known as a phospholipase-A2, an enzyme that cleaves phospho-lipids on the cell membrane to release a chemical called arachidonic acid (AA). While the mechanism of action of AA in stabilizing memory still is unknown, this molecule has already been implicated in memory formation in chickens and rodents. The current genetic findings from fli
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Contact: Heidi Hardman
hhardman@cell.com
617-397-2879
Cell Press
16-Feb-2004


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