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Related Concept Videos

Transduction01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
Transcription01:10

Transcription

Overview
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.
Transcription Can Produce Different Kinds...
Transcription01:17

Transcription

Transcription is the synthesis of 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 correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds of RNA Molecules
In eukaryotes,...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
Transcription Factors02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

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Related Experiment Video

Updated: May 16, 2026

Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
09:58

Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis

Published on: June 27, 2020

Functionality versus Adaptation: Insights from Transcriptional Adaptation.

Qi Cao1, Yuange Duan2

  • 1International Cancer Institute, Health Science Center, Peking University, Beijing, 100191, China.

Journal of Molecular Evolution
|May 14, 2026
PubMed
Summary
This summary is machine-generated.

Transcriptional adaptation (TA) is a gene regulation mechanism. However, its potential flaws question if the entire TA process is truly adaptive, suggesting functionality doesn't always equal adaptation.

Keywords:
Constructive neutral evolution (CNE)FunctionalityMolecular error hypothesisRNA editingTranscriptional adaptation

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Last Updated: May 16, 2026

Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
09:58

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Published on: June 27, 2020

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Area of Science:

  • Evolutionary biology
  • Molecular genetics
  • Gene regulation

Background:

  • Transcriptional adaptation (TA) involves ILF3 binding mRNA fragments to upregulate related genes for compensation.
  • The adaptive nature of TA is questioned due to potential off-targeting, mutation sensitivity, and self-regulatory issues.

Purpose of the Study:

  • To critically evaluate the definition and scope of adaptation in biological mechanisms.
  • To distinguish between case-specific benefits and the overall adaptive nature of a mechanism like TA.
  • To explore alternative evolutionary origins for functional molecular processes.

Main Methods:

  • Conceptual analysis of adaptation using the drift-barrier hypothesis.
  • Comparative illustration using RNA editing as a functional process.
  • Discussion of constructive neutral evolution (CNE) and genetic buffering.

Main Results:

  • A few beneficial instances do not confirm the entire TA mechanism as adaptive.
  • Functional molecular processes, like RNA editing, may arise via CNE and be buffered by genetic capacitors.
  • Functionality is necessary but insufficient to define a mechanism as adaptive; evolutionary origins must be considered.

Conclusions:

  • The definition of adaptation requires careful distinction between specific cases and global mechanisms.
  • Mechanisms may be functional due to constructive neutral evolution rather than direct adaptation.
  • Investigating the omics-level origins and evolution is crucial to determine if a functional mechanism is truly adaptive.