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Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development
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Bmlark is essential for embryonic development.

Yuling Peng1,2, Jin Li1, Kangkang Niu1

  • 1Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou, 510631, China.

BMC Genomics
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

The transcription factor Bmlark is crucial for silkworm embryonic development. Loss of Bmlark function leads to lethal developmental defects, impacting cuticle formation and melanization.

Keywords:
BmlarkBombyx moriEmbryonic developmentMelanizationMutantSclerotization

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The function of transcription factor lark in Drosophila is known, but its role in Bombyx mori embryonic development requires elucidation.
  • Investigating lark's function in silkworms can reveal conserved developmental mechanisms.

Purpose of the Study:

  • To investigate the function of the transcription factor Bmlark in Bombyx mori embryonic development.
  • To identify genes regulated by Bmlark during silkworm embryogenesis.

Main Methods:

  • CRISPR/Cas9 gene editing was employed to create a Bmlark mutant Bombyx mori strain.
  • Transcriptomic analysis (RNA-Seq) was performed to compare gene expression between Bmlark mutant and wild-type embryos.

Main Results:

  • Homozygous Bmlark mutant embryos (Bmlark-/-) were lethal, exhibiting defects in exoskeleton sclerotization and melanization.
  • Transcriptomic analysis revealed significant alterations in the expression of 63 putative cuticle protein genes and five pigment synthesis genes in Bmlark-/- embryos.
  • Key genes involved in cuticle formation and tyrosine-mediated pigmentation pathways showed differential expression, with downregulation of most pigment synthesis genes.

Conclusions:

  • Bmlark is essential for normal silkworm embryonic development, particularly for cuticle formation and melanization.
  • Bmlark regulates the expression of numerous cuticle protein genes and genes involved in pigment synthesis.