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Defining behavioral and molecular differences between summer and migratory monarch butterflies
Haisun Zhu1, Robert J Gegear, Amy Casselman
1Department of Neurobiology, University of Massachusetts Medical School, Plantation Street, Worcester, MA 01605, USA. Haisun.Zhu@gmail.com
BMC Biology
|April 2, 2009
Summary
Eastern North American monarch butterflies migrate south in the fall, entering a non-reproductive state. Gene expression in their brains molecularly separates migratory from summer butterflies, independent of reproductive hormones.
Area of Science:
- * Animal Behavior
- * Neurobiology
- * Genomics
Background:
- * Eastern North American monarch butterflies (Danaus plexippus) undertake long-distance fall migrations.
- * Fall migrants exhibit juvenile hormone deficiency, leading to reproductive arrest and extended longevity.
- * Migrants utilize a time-compensated sun compass for navigation.
Purpose of the Study:
- * Investigate the relationship between juvenile hormone status and oriented flight in monarch butterflies.
- * Identify molecular differences between migratory and summer monarch butterflies.
- * Determine the molecular correlates of behavioral states in monarch migration.
Main Methods:
- * Utilized a flight simulator to monitor directional flight behavior and orientation.
- * Employed microarray analysis of 9417 unique cDNA sequences for gene expression profiling.
- * Analyzed gene expression in monarch butterfly brains.
Main Results:
- * Elevating juvenile hormone activity in fall migrants did not alter their directional flight or orientation.
- * Identified 40 differentially expressed genes in the brain correlating with oriented flight, independent of juvenile hormone.
- * Discovered 23 juvenile hormone-dependent genes separating reproductive from non-reproductive monarchs, with genes for longevity, metabolism, and immunity upregulated in non-reproductive migrants.
Conclusions:
- * Seasonal changes in genomic function are crucial in defining the migratory state of monarch butterflies.
- * Key behavioral traits, like migration, are linked to specific gene expression profiles in the brain.
- * Molecularly distinguishes migratory fall monarchs from reproductive summer monarchs.
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