Gain-of-function STAT1 mutations are associated with intracranial aneurysms

Area of Science:

• Immunology
• Genetics
• Neurology

Background:

• Gain-of-function (GOF) signal transducer and activator of transcription 1 (STAT1) mutations typically cause chronic mucocutaneous candidiasis.
• Intracranial aneurysms have been anecdotally reported in GOF STAT1 mutation carriers, but the association remains unclear.

Observation:

• This study presents two cases linking intracranial aneurysms to GOF STAT1 mutations.
• Upregulated phosphorylated STAT4 and IL-12 receptor β1 were observed in patient blood cells upon stimulation.
• Increased transforming growth factor-β type 2 receptor expression and SMAD3 phosphorylation were detected in the patient.

Findings:

• The study establishes a potential association between GOF STAT1 mutations and the development of intracranial aneurysms.
• Elevated levels of specific signaling molecules (pSTAT4, IL-12Rβ1, TGF-β type 2 receptor, pSMAD3) suggest a molecular mechanism.
• The patient's mother developed disseminated bacille Calmette-Guérin disease post-vaccination, indicating potential susceptibility to mycobacteria.

Implications:

• This research highlights a potential neurological complication associated with GOF STAT1 mutations.
• Understanding these molecular pathways may lead to novel therapeutic strategies for patients with STAT1 GOF mutations.
• Further investigation is warranted to confirm the predisposition to mycobacterial infections in individuals with GOF STAT1 mutations.