Research
in Progress
Dr.
Slattery's research interests include chemical ecology and natural products
chemistry of marine and freshwater bacteria, algae, and invertebrates. Chemical
ecology is a rapidly expanding interdisciplinary field (due in part to the pharmaceutical
and biotechnological applications of this research) focused on the ecological
roles of the myriad of chemical compounds produced by various organisms. Aquatic
habitats (marine and freshwater) account for over 75% of the surface area of
the planet and provide diverse ecosystems which can be mediated by chemical
signals. For instance, predator-prey interactions, competition, symbioses, reproduction,
and larval settling cues often involve novel functionalized metabolites and
highly specific target receptor systems. The allocation of secondary metabolites
to specific structures within the organisms, such as growth or reproductive
regions, and biogeographic variability implies the compounds are produced at
a cost to the individual and may be a nutrient dependent phenomenon. In understanding
the ecophysiological factors which effect production of these bioactive compounds,
and the costs imposed at both the organismal and population levels, we can determine
the best ways to assure availability of novel natural products that might prove
valuable as pharmaceutical, antifoulant, or pesticide products. An additional aspect of this research involves the development of bioassays
to test the physiological mechanisms of secondary metabolite bioactivity. Using
either cellular or molecular techniques (i.e., mitotic condition, enzyme inhibition,
or RNA expression) we can determine the specific mode of action for isolated
metabolites of interest. These results provide relevant information of an ecological
as well as a pharmacological nature. For instance, if we can determine the cellular
target of a novel metabolite in a natural system we might better understand
potential pharmaceutical roles for these compounds. Moreover, these mechanism-based
assays can drive development of highly selective biosynthetic analogs that may
prove to be easier and/or more cost efficient to produce. Vegetative or clonal organisms such as bacteria, algae, and many invertebrates,
provide exceptional models to examine costs of metabolite production and the
factors which influence metabolite synthesis and/or transformation. Individuals
of a select genet can be effectively manipulated in laboratory and field experiments
designed to induce production of bioactive compounds so that true ecophysiological
responses, and not individual variability, are measured. My research over the
past five years has focused on population of soft corals from Antarctica and
the tropical Pacific which are clonal, contain bioactive compounds (typically
terpenes) of ecological importance, and show temporal, biogeographic, and ontogenetic
variability in secondary metabolite production. My current field studies involve
manipulations of grazing pressure, interspecific competitive interactions, UV
light, and depth distribution to determine the ecophysiological effects on compound
production. Ongoing research, to clarify the evolutionary significance of secondary
metabolite synthesis, is focused on diverse groups of bacteria, algae, and invertebrates
collected in various aquatic ecosystems from the depths of Monterey Bay, CA
using either scuba or submersible technologies.
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