Genetics of cognitive dysfunction in Parkinson's disease

Area of Science:

• Neuroscience
• Genetics
• Neurology

Background:

• Cognitive symptoms in Parkinson's disease (PD) exhibit significant variability.
• Understanding the genetic underpinnings of PD-related cognitive impairment is crucial for personalized patient counseling and treatment strategies.
• Seven major genes (SNCA, LRRK2, VPS35, PRKN, PINK1, DJ1, GBA) are known to increase PD risk with varying penetrance.

Purpose of the Study:

• To review the current knowledge on the relationship between specific genetic factors and cognitive outcomes in Parkinson's disease.
• To summarize the roles of seven strongly-associated PD genes and select PD risk variants in cognitive symptom presentation and progression.

Main Methods:

• Literature review of genetic associations with Parkinson's disease and cognitive function.
• Analysis of data from genome-wide association studies (GWAS) identifying PD risk loci.
• Synthesis of information on established PD risk genes and selected risk variants.

Main Results:

• The chapter details the known associations of SNCA, LRRK2, VPS35, PRKN, PINK1, DJ1, and GBA with PD.
• It also covers selected PD risk variants such as PITX3, TMEM106B, SNCA Rep1, APOɛ4, COMT, and MAPT H1/H1.
• The review highlights the specific impact of these genetic factors on cognitive aspects of Parkinson's disease.

Conclusions:

• Genetic factors play a significant, albeit complex, role in the variability of cognitive symptoms observed in Parkinson's disease.
• Knowledge of these genetic associations is essential for advancing research and clinical management of PD cognitive impairment.
• Further research into these genetic risk factors will refine patient prognostication and therapeutic approaches.