What are the molecular mechanisms by which ephrinB2-EphB4-RASA1 mutations cause cerebrovascular malformations?

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Priority

85%

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92%

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Market price

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Description

The abstract mentions ‘emerging paradigms of molecular and cellular pathophysiology’ but indicates these mechanisms are still being elucidated. Understanding these pathways is critical for developing targeted therapies for severe neonatal brain arteriovenous malformations.

Gap type: unexplained_observation Source paper: EphrinB2-EphB4-RASA1 Signaling in Human Cerebrovascular Development and Disease. (2019, Trends Mol Med, PMID:30819650)

Resolution criteria

Resolution requires: (1) Structural biology (cryo-EM or X-ray) of ephrinB2-EphB4 complex with >=2 RASA1 mutant variants, identifying specific interface disruptions or allosteric changes (binding affinity KD shift >=5-fold); (2) Vessel organoid or mouse brain endothelial cell assays testing >=3 mutations for their effect on tip cell migration, sprouting angiogenesis, and junction integrity (VE-cadherin localization); (3) In vivo model with RASA1 mutant showing cerebrovascular malformations reproducible in >=80% of mutant animals. Variant classification without functional validation of angiogenesis mechanisms is insufficient.

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