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A feminizing switch in a hemimetabolous insect.

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Researchers discovered a key gene, Nlfmd, that acts as a female determiner in brown planthoppers. Its absence causes masculinization, revealing new insights into insect sex determination mechanisms.

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Area of Science:

  • Entomology
  • Genetics
  • Molecular Biology

Background:

  • Sex determination mechanisms in hemimetabolous insects are not well understood.
  • The brown planthopper (BPH), Nilaparvata lugens, is a significant agricultural pest.

Purpose of the Study:

  • To identify the genetic factors controlling sex determination in Nilaparvata lugens.
  • To elucidate the molecular mechanism of feminization in BPH.

Main Methods:

  • RNA interference (RNAi) and CRISPR-Cas9 for gene knockdown.
  • Analysis of somatic morphology and doublesex splicing.
  • In vitro binding assays and protein complex formation studies.

Main Results:

  • Identified Nlfmd as a feminizing switch, encoding a serine/arginine-rich protein.
  • Knockdown of Nlfmd in females caused masculinization and altered doublesex splicing.
  • Depletion of Nlfmd led to female-specific embryonic lethality.
  • Nlfmd2 was also found to induce masculinization and interact with Nlfmd.

Conclusions:

  • Nlfmd acts as a crucial female determiner in Nilaparvata lugens.
  • Nlfmd2 functions as an RNA-binding partner, modulating Nldsx splicing with NlFMD.
  • These findings offer novel insights into the diverse mechanisms of insect sex determination.