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Related Concept Videos

Decreasing Function01:27

Decreasing Function

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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Transcription01:10

Transcription

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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...
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Transcription Factors02:16

Transcription Factors

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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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Master Transcription Regulators02:23

Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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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.
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Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Related Experiment Video

Updated: Jan 29, 2026

Measurement of Chitinase Activity in Biological Samples
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Measurement of Chitinase Activity in Biological Samples

Published on: August 22, 2019

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The deletion of the AcMNPV ac124 gene resulted in a decrease in chitinase transcription.

Zhixin Fang1, Yi Que2, Jie Li1

  • 1Department of Laboratory Medicine and Central Laboratories, Guangdong Second Provincial General Hospital, 466 Middle Xingang Road, Guangzhou, 510317, Guangdong, People's Republic of China.

Virus Research
|February 4, 2019
PubMed
Summary

The Autographa californica multiple nucleopolyhedrovirus ac124 gene regulates chitinase expression. Deleting this gene reduces chitinase transcription without impacting virus production or other viral protein levels.

Keywords:
AcMNPVBaculovirusChitinaseTranscriptionac124

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Area of Science:

  • Virology
  • Molecular Biology
  • Insect Pathology

Background:

  • The Autographa californica multiple nucleopolyhedrovirus (AcMNPV) ac124 gene is recognized as a viral pathogenicity factor.
  • Understanding the precise role of ac124 in AcMNPV infection is crucial for insect pest control strategies.

Purpose of the Study:

  • To investigate the function of the ac124 gene within the AcMNPV genome during host infection.
  • To elucidate the molecular mechanisms underlying ac124's role in viral pathogenicity.

Main Methods:

  • Generation of an ac124-knockout AcMNPV (vAc124KO) for comparative analysis.
  • Analysis of viral progeny (budded virus and occlusion bodies) and protein expression (GP64, VP39, P6.9, polyhedrin) via Western blotting.
  • Gene expression analysis using qRT-PCR for chitinase and cathepsin.
  • Luciferase reporter assays to assess promoter activity.

Main Results:

  • The absence of ac124 did not alter budded virus or occlusion body production in Sf9 cells.
  • Deletion of ac124 did not affect the temporal expression of key viral proteins.
  • vAc124KO infection showed significantly reduced chitinase transcription compared to wild-type AcMNPV (vAcWT).
  • Ac124 overexpression enhanced the chitinase promoter's ability to drive reporter gene expression.

Conclusions:

  • The ac124 gene plays a regulatory role in chitinase gene expression during AcMNPV infection.
  • Ac124 likely binds to the chitinase promoter to modulate its transcriptional activity.
  • This finding provides new insights into the molecular mechanisms of AcMNPV pathogenicity.