Presymptomatic signs in healthy CJD mutation carriers

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Creutzfeldt-Jacob disease (CJD) is a fatal, rapidly progressing dementia.
• Familial CJD, specifically the E200K mutation, presents a unique opportunity for preclinical research.
• Identifying early indicators is crucial for timely diagnosis and potential intervention.

Purpose of the Study:

• To detect preclinical neuropsychological signs in healthy carriers of the CJD E200K mutation.
• To investigate anxiety levels and cognitive functions in mutation carriers versus controls.
• To establish if these signs correlate with age and precede clinical CJD onset.

Main Methods:

• Neuropsychological tests were administered to 27 healthy first-degree relatives of genetic CJD patients.
• Participants were divided into two groups: 13 E200K mutation carriers and 14 controls.
• Statistical analysis, including Repeated Measure analysis, was used to compare groups and identify significant differences.

Main Results:

• Healthy mutation carriers exhibited significantly lower Trait anxiety and higher State anxiety scores.
• The Anxiety Index progressed with age in carriers, but not in controls, especially in older subjects.
• Cognitive differences were noted, particularly in visual recognition of pictured objects, with deficits most pronounced in elderly carriers.

Conclusions:

• Abnormal stress mechanisms and subtle cognitive deficits precede the clinical onset of familial CJD.
• These preclinical changes are most evident in older mutation carriers.
• This research is the first to demonstrate dysfunction in healthy CJD mutation carriers, paving the way for early diagnostic strategies.