A novel CCM1 mutation associated with multiple cerebral and vertebral cavernous malformations

Area of Science:

• Genetics
• Neurology
• Vascular Biology

Background:

• Cerebral cavernous malformations (CCMs) are rare vascular disorders affecting the central nervous system.
• CCMs are associated with mutations in CCM1, CCM2, and CCM3 genes.

Observation:

• A multigenerational Italian family presented with multiple cerebral and vertebral cavernous malformations.
• The proband, diagnosed with supratentorial cavernous angiomas, harbored a novel heterozygous nucleotide substitution (c.263-10A>G) in the CCM1 gene.
• This variant segregated with the disease in affected relatives and led to aberrant splicing in the proband's lymphocytes.

Findings:

• The c.263-10A>G mutation in CCM1 creates an abnormal splice site, resulting in partial intron retention and a premature termination codon.
• This genetic defect is directly associated with the development of cerebral cavernous malformations.

Implications:

• Early diagnosis of CCMs can be improved through genetic identification of the c.263-10A>G mutation.
• Understanding the genotype-phenotype correlation aids in appropriate clinical surveillance for patients with CCMs.