Cerebral Circulation - Cognition and Behavior (Jan 2024)

The protocol for an observational Australian cohort study of CADASIL: The AusCADASIL study

  • Danit G. Saks,
  • Beata Bajorek,
  • Vibeke S. Catts,
  • Adam C. Bentvelzen,
  • Jiyang Jiang,
  • Wei Wen,
  • Karen A. Mather,
  • Anbupalam Thalamuthu,
  • Jessie Huang-Lung,
  • Lisa Nivison-Smith,
  • Lyn R. Griffiths,
  • Robert A. Smith,
  • Adrienne Sexton,
  • Paul James,
  • Tharusha Jayasena,
  • Anne Poljak,
  • Gurpreet K. Hansra,
  • Satoshi Hosoki,
  • Ashley Park,
  • Claudia M. Hillenbrand,
  • Peter van Wijngaarden,
  • Russell J. Chander,
  • Sam Humphrey,
  • Rory Chen,
  • Nicole A. Kochan,
  • Tessa J. Helman,
  • Christopher Levi,
  • Amy Brodtmann,
  • Michael J. O'Sullivan,
  • Romesh Markus,
  • Ken Butcher,
  • Mark Parsons,
  • Jason C. Kovacic,
  • Perminder S. Sachdev

Journal volume & issue
Vol. 6
p. 100225

Abstract

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Introduction: Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) is a rare genetic condition with a broad phenotypic presentation. This study aims to establish the first Australian cohort of individuals affected by CADASIL (AusCADASIL) and examine its clinical features and longitudinal course, and to investigate neuroimaging and blood biomarkers to assist in early diagnosis and identify disease progression. Methods: Participants will be recruited from six study centres across Australia for an observational study of CADASIL. We aim to recruit 150 participants with diagnosed CADASIL, family history of CADASIL or suspected CADASIL symptoms, and 150 cognitively normal NOTCH3 negative individuals as controls. Participants will complete: 1) online questionnaires on medical and family history, mental health, and wellbeing; 2) neuropsychological evaluation; 3) neurological examination and brain MRI; 4) ocular examination and 5) blood sample donation. Participants will have annual follow-up for 4 years to assess their progression and will be asked to invite a study partner to corroborate their self-reported cognitive and functional abilities.Primary outcomes include cognitive function and neuroimaging abnormalities. Secondary outcomes include investigation of genetics and blood and ocular biomarkers. Data from the cohort will contribute to an international consortium, and cohort participants will be invited to access future treatment/health intervention trials. Discussion: AusCADASIL will be the first study of an Australian cohort of individuals with CADASIL. The study will identify common pathogenic variants in this cohort, and characterise the pattern of clinical presentation and longitudinal progression, including imaging features, blood and ocular biomarkers and cognitive profile.

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