Polymorphism of PRNP codons in the normal Icelandic population

Area of Science:

• Neurogenetics
• Human Genetics
• Molecular Biology

Background:

• Prion protein gene (PRNP) polymorphisms significantly impact human susceptibility and disease phenotypes, including Creutzfeldt-Jakob disease (CJD).
• Methionine-methionine (MM) homozygosity at PRNP codon 129 is a known risk factor for sporadic CJD.
• Variations at codon 117 and octapeptide repeat regions are linked to genetic CJD forms.

Purpose of the Study:

• To investigate the frequency and distribution of key prion protein gene polymorphisms in a healthy European population.
• To establish a genetic baseline for PRNP codon 129, codon 117, and octapeptide repeat variations.
• To assess potential gender or age-related differences in these common genetic markers.

Main Methods:

• Genotyping of 208 healthy blood donors for PRNP polymorphisms at codons 129 and 117.
• Analysis for the presence of octapeptide repeat deletions.
• Statistical evaluation of polymorphism frequencies across different demographic groups.

Main Results:

• Codon 129 polymorphism frequencies: MM (46.6%), MV (44.7%), VV (8.7%).
• Codon 117 polymorphism observed in 4.8% of individuals; no octapeptide repeat deletions detected.
• No significant gender or age-related differences in codon 129 polymorphism distribution were found.

Conclusions:

• The observed frequencies of PRNP codon 129 polymorphisms in this healthy cohort align with general European populations.
• This data provides valuable genetic background information on prion protein gene variations in healthy individuals.
• Understanding the prevalence of these polymorphisms is crucial for interpreting their role in prion disease pathogenesis.