Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

Human prion protein gene (PRNP) is considered a critical and fundamental gene in determining the incidence of human prion diseases. Codons 129 and 219 play an important role in the susceptibility to sporadic Creutzfeldt-Jakob disease (CJD). An association between sporadic CJD and the polymorphism (PRNP 1368) in an upstream of PRNP exon 1 has been reported in the British and German populations, but study in the Dutch population has failed to confirm an association.', 'To investigate whether the PRNP 1368 polymorphism is associated with sporadic CJD in the Korean population.', 'We compared the genotype and allele frequencies of PRNP 1368 polymorphism in 171 sporadic CJD patients with those in 212 healthy Koreans.
Is pRNP 1368 polymorphism associated with sporadic Creutzfeldt-Jakob disease in the Korean population?