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Why can insects not biosynthesize cholesterol?

Eric Haas1, Yonggyun Kim2, David Stanley3

  • 1Department of Chemistry and Biochemistry, Creighton University, Omaha, Nebraska, USA.

Archives of Insect Biochemistry and Physiology
|November 14, 2022
PubMed
Summary
This summary is machine-generated.

Insects can synthesize linoleic acid (LA) and some produce prostaglandins, but unlike mammals, they cannot produce cholesterol. Most protostomes also lost cholesterol synthesis, highlighting their need for dietary sterols.

Keywords:
cholesterolevolutionfossilinsectprotostome

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Area of Science:

  • * Insect Biochemistry
  • * Lipid Metabolism
  • * Evolutionary Biology

Background:

  • * Mammals require dietary polyunsaturated fatty acids (PUFAs) like linoleic acid (LA).
  • * Insects exhibit unique lipid biochemistry, differing from mammals in PUFA synthesis and cholesterol metabolism.
  • * Most protostomes lost genes for cholesterol biosynthesis during the Ediacaran Period.

Purpose of the Study:

  • * To explore insect lipid biochemistry, focusing on PUFA and cholesterol synthesis.
  • * To investigate the evolutionary loss of cholesterol biosynthesis in protostomes.
  • * To address the requirement and advantages of exogenous sterols in protostomes.

Main Methods:

  • * Literature review of insect and mammalian lipid biochemistry.
  • * Analysis of gene loss in protostome evolution.
  • * Comparative biochemistry of sterol metabolism.

Main Results:

  • * Some insect species can biosynthesize linoleic acid (LA) de novo and further convert it into other PUFAs.
  • * Certain insects utilize LA for synthesizing prostaglandins and eicosanoids, crucial signaling molecules.
  • * Insects and most protostomes lack genes for cholesterol biosynthesis, necessitating dietary cholesterol intake.

Conclusions:

  • * Insect lipid metabolism presents distinct pathways compared to mammals, particularly in PUFA and sterol synthesis.
  • * The inability to synthesize cholesterol is a shared trait among most protostomes, indicating an ancient evolutionary event.
  • * Understanding the reliance on exogenous sterols is crucial for comprehending protostome physiology and evolution.