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Updated: Aug 6, 2026
05:57
Fat Preference: A Novel Model of Eating Behavior in Rats
Published on: June 27, 2014
Genetically controlled food preference: biochemical mechanisms
1Department of Biology, New York University, Washington Square 10003.
Summary
Genetic differences in Gammarus palustris food preferences are linked to amylase enzyme activity. Specific amylase-starch interactions release distinct saccharide proportions, influencing feeding choices and highlighting enzymes' chemosensory roles.
Area of Science:
- Animal behavior
- Biochemistry
- Genetics
Background:
- Food choice in Gammarus palustris correlates with genotype.
- Amy II.52 allele homozygotes prefer Enteromorpha intestinalis (E) over Ulva lactuca (U) compared to Amy II.55 homozygotes.
Purpose of the Study:
- To investigate if differing saccharide proportions released by amylase-enzyme interactions explain genotype-specific feeding preferences.
- To test the hypothesis that specific amylase-starch combinations better stimulate feeding.
Main Methods:
- Purification of two amylase forms (Amy II.52 and Amy II.55) using glycogen/ethanol precipitation and preparative PAGE.
- Determination of product distributions from amylase action on E and U starches using High-Performance Liquid Chromatography (HPLC).
- Feeding preference tests with artificial foods containing varying sugar compositions.
Main Results:
- Each amylase/starch combination yielded distinct product profiles of maltose, maltotriose, and maltotetraose.
- Artificial foods mimicking Amy II.52/E starch or Amy II.55/U starch interactions were preferred over others.
- Preference patterns for artificial foods mirrored those observed with intact algae.
Conclusions:
- Genotypic variations in feeding preferences are explained by biochemical differences in digestive enzymes.
- Digestive enzymes play a significant chemosensory role by modifying environmental stimuli before gustation.
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