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Identification of Functionally-Relevant Lentivirus Integration Sites in an Insertional Mutagenesis Cell Library
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Forward genetic screening for regulators involved in cholesterol synthesis using validation-based insertional

Wei Jiang1, Jing-Jie Tang1, Hong-Hua Miao1

  • 1Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.

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|November 27, 2014
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Summary

The validation-based insertional mutagenesis system successfully identified novel genes regulating cholesterol biosynthesis. This method isolated mutants with altered sterol regulatory element-binding protein (SREBP) and HMG-CoA reductase, crucial for cholesterol production.

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Somatic cell genetics aids in understanding cholesterol metabolism regulation.
  • Identifying specific mutant genes is challenging due to traditional chemical or physical mutagenesis methods.

Purpose of the Study:

  • To employ an unbiased forward genetics approach for identifying genes controlling cholesterol biosynthesis.
  • To isolate and characterize mutants resistant to 25-hydroxycholesterol (25-HC) and SR-12813.

Main Methods:

  • Utilized the validation-based insertional mutagenesis (VBIM) system.
  • Screened for cell lines exhibiting resistance to cholesterol biosynthesis inhibitors (25-HC and SR-12813).

Main Results:

  • Isolated five mutant cell lines.
  • Four mutants showed resistance due to truncated sterol regulatory element-binding protein (SREBP)-2 or overexpressed SREBP cleavage-activating protein (SCAP).
  • One mutant exhibited resistance linked to a truncated 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase).

Conclusions:

  • The VBIM system is effective for discovering novel regulatory genes in cholesterol biosynthesis.
  • Identified key components of cholesterol regulation including SREBP and HMG-CoA reductase pathways.