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Mosaic inactivation of CCM2 causes cerebral cavernous malformations (CCMs). Zebrafish models reveal this process involves aberrant blood vessel formation and KLF2, offering insights into CCM pathogenesis.

Keywords:
angiogenesisblood flow signalingcerebral cavernous malformationsdevelopmental biologyzebrafish

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Area of Science:

  • Vascular biology
  • Genetics
  • Developmental biology

Background:

  • Mosaic inactivation of the CCM2 gene in humans causes cerebral cavernous malformations (CCMs).
  • CCMs are characterized by dilated, blood-filled lesions with multiple cavernous spaces.
  • Understanding the molecular mechanisms underlying CCM formation is crucial for developing effective treatments.

Purpose of the Study:

  • To establish a zebrafish model for studying CCM pathogenesis.
  • To investigate the role of CCM2 and KLF2 in vascular development and CCM formation.
  • To elucidate the mechanism behind the formation of multi-cavernous lesions.

Main Methods:

  • CRISPR-Cas9 mutagenesis was used to induce mosaic inactivation of the ccm2 gene in zebrafish.
  • Zebrafish embryos were analyzed for vascular abnormalities, specifically in the caudal venous plexus (CVP).
  • Gene expression analysis, including klf2a, and histological examination of lesions were performed.

Main Results:

  • Mosaic inactivation of zebrafish ccm2 resulted in a lethal embryonic CVP lesion characterized by intraluminal pillars obstructing blood flow.
  • These pillars represented abortive intussusceptive angiogenesis due to mosaic ccm2 inactivation, patchy klf2a overexpression, and aberrant flow signaling.
  • Surviving adult fish exhibited CCMs similar to those found in humans, and the formation of both embryonic lesions and adult CCMs was dependent on the transcription factor KLF2.

Conclusions:

  • The study successfully developed a zebrafish model that recapitulates key features of human CCMs.
  • Mosaic ccm2 inactivation disrupts vascular development through aberrant angiogenesis mediated by KLF2 and flow signaling.
  • This research provides a mechanistic explanation for the formation of multi-cavernous lesions in CCMs, highlighting a conserved pathogenesis between zebrafish and mammals.