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Related Concept Videos

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
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Related Experiment Video

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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Rapid evolutionary changes in gene expression in response to climate fluctuations.

Elena Hamann1,2, Christopher S Pauli3, Zoé Joly-Lopez4

  • 1Department of Biological Sciences, Fordham University, Bronx, NY, USA.

Molecular Ecology
|August 8, 2020
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Summary

Rapid evolution in gene expression was observed in Brassica rapa populations adapting to environmental changes. This study highlights gene expression shifts as a key mechanism driving contemporary evolution.

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Brassica rapaRNA-seqdrought stressflowering timeresurrection study

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular biology

Background:

  • Evidence for rapid evolution in natural populations is abundant, yet genetic mechanisms remain unclear.
  • Changes in gene expression are a potential driver of rapid evolutionary adaptation.
  • Environmental fluctuations, such as precipitation changes, can impose selection pressures on populations.

Purpose of the Study:

  • To investigate contemporary evolutionary changes in genome-wide gene expression in response to environmental fluctuations.
  • To determine if changes in gene expression contribute to rapid adaptation in natural populations.
  • To explore the genetic basis of contemporary evolution using a resurrection approach.

Main Methods:

  • Utilized RNA-sequencing (RNA-seq) to compare genome-wide gene expression.
  • Employed a resurrection approach by analyzing Brassica rapa populations collected over multiple time points (1997-2014).
  • Combined transcriptome profiling with historical population samples.

Main Results:

  • Identified a substantial number of differentially expressed genes between generations in both populations, indicating rapid gene expression evolution.
  • Observed significant changes in genes related to stress response and flowering time, potentially linked to precipitation fluctuations.
  • Found that evolutionary changes in gene expression varied across generations and populations, suggesting independent evolutionary trajectories.

Conclusions:

  • Provides strong evidence for rapid evolution of gene expression as a mechanism for adaptation to environmental change.
  • Demonstrates that changes in gene expression play a significant role in contemporary evolutionary responses to selection.
  • Highlights the power of combining resurrection studies with transcriptomics for understanding gene regulatory evolution.