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Record W4242129169 · doi:10.22215/etd/2016-11675

Histone methylation in the freeze-tolerant wood frog, Rana sylvatica

2016· dissertation· en· W4242129169 on OpenAlexaff
Liam J. Hawkins

Bibliographic record

Venuenot available
Typedissertation
Languageen
FieldBiochemistry, Genetics and Molecular Biology
TopicEpigenetics and DNA Methylation
Canadian institutionsCarleton UniversityDalhousie University
Fundersnot available
KeywordsHistone methyltransferaseHistoneHistone methylationBiologyEpigeneticsCell biologyHistone codeGeneticsDNA methylationGeneGene expression

Abstract

fetched live from OpenAlex

The wood frog, Rana sylvatica, has developed numerous adaptations to survive days with up to 65% of its body fluid frozen.One such adaptation is to reduce their metabolic rate, employing only those processes needed to survive until temperatures rise.The establishment of this hypometabolic state is mediated by transcriptional regulation that is elicited in part by histone methylation, however this has yet to be explored in the context of metabolic rate depression and freeze tolerance.This thesis provides the first characterization of histone methyltransferases (HMTs) and the histone and non-histone proteins they methylate in the wood frog.Transcriptionally permissive histone residues (H3K4me1 and H3K27me1) were found to decrease during freezing in skeletal muscle while those that silence transcription (H3K9me3 and H3K36me2) were maintained, whereas differential levels of histone residues were seen in liver.These findings suggest a novel role for HMTs in freeze tolerance.student I am today.I thank you for your mentorship, insights into the world of science, academia, and administration, and truly value your advice inside and out of the lab.I would also like to thank Jan Storey for her editorial review of this thesis and other documents.It is your hard work, knowledge, and patience, that ensures the lab runs as smooth and successful as it does.I also thank all the Storey lab members, both past and present, for creating such a positive and fun environment to work in every day.In particular I would like to thank Sanoji Wijenayake for mentoring me and guiding my project, Kama Szereszewski for introducing me to the world of western blotting, and Bryan Luu for teaching me necessary techniques for other and future projects.Of course, I would not be here today if it were not for my parents, brother, and sister.Mom and Dad, thank you for always supporting, encouraging

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.002
Threshold uncertainty score0.005

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.011
GPT teacher head0.293
Teacher spread0.282 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations1
Published2016
Admission routes1
Has abstractyes

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