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Social Signals Reprogram Developmental Trajectories

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File(s)
Brown_cornellgrad_0058F_15626.pdf (6.02 MB)
Chapter1_DevTransExpressionTool.R (3 KB)
Chapter1_Transcriptome_metadataRDB.csv (6.26 KB)
Chapter1_Developmental_normalized_counts.csv (17.21 MB)
Chapter1_Combined_Dev_ModuleGO.xlsx (1017.6 KB)
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No Access Until
2028-06-22
Permanent Link(s)
https://doi.org/10.7298/v2pp-2y88
https://hdl.handle.net/1813/126561
Collections
Cornell Theses and Dissertations
Author
Brown, Ron
Abstract

Phenotype is a dialogue between genetic and environmental factors. Many previous studies have shown that environmental conditions can change the phenotypes of developing individuals and social signals from parent to offspring are being increasingly investigated as drivers of alternative phenotypes. This developmental plasticity is especially important to eusocial insects such as the privately eusocial paper wasps Polistes fuscatus. The norther paper wasp, P.fuscatus produces workers early season and gynes late season, and the only categorical difference between how these offspring are reared is antennal drumming, a vibroacoustic signal generated by foundresses early season that produces a worker-like phenotype in adults. I examined the mechanism by which this signal is altering developmental trajectories. First, I constructed a developmental transcriptional atlas to provide high resolution expression information at each developmental stage. I also investigated the transcriptional dynamics and evolutionary age of a conserved set of caste associated genes in wasps. Nest I probed the transcriptional consequences of sustained antennal drumming on developing larvae, implicating ecdysone signaling and lipid metabolism before examining the initial cascade induced by a single antennal drumming bout under higher temporal and tissue resolution. After identifying several genes in the early and late cascade in head and bodies, all data suggested that developmental timing was affected. Finally, I tested this hypothesis directly and found that, indeed, antennal drumming was shortening larval development time leading to early pupation.

Description
118 pages
Supplemental file(s) description: Chapter 2 Fig2.19 Actuator Pupation experiment, Chapter 2 Fig2.17 Actuator bout simulation, Developmental Transcriptome WCGNA GOterms, Developmental Transcriptome Expression Counts, Developmental Transcriptome Expression Metadata, Developmental Transcriptome Expression Script.
Date Issued
2026-05
Keywords
Caste
•
Development
•
Transcritptomics
•
Wasp
Committee Chair
Sheehan, Michael
Committee Member
Moreau, Corrie
Sandkam, Benjamin
Yapici, Nilay
Degree Discipline
Neurobiology and Behavior
Degree Name
Ph. D., Neurobiology and Behavior
Degree Level
Doctor of Philosophy
Type
dissertation or thesis

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