Chorea-Acanthocytosis: ChAc is a rare progressive neurological disorder caused by mutations in a very complex gene. Dr Antonio Velayos-Baeza is interested in two main projects: Chorea-acanthocytosis (ChAc), a rare autosomal-recessive disorder that is characterised by progressive neurodegeneration and red cell acanthocytosis (spiky red blood cells), and Developmental dyslexia, the most common of the childhood learning disorders.