Familial Mediterranean fever: Penetrance of the p.[Met694Val];[Glu148Gln] and p.[Met694Val];[=] genotypes

Ori Eyal, Yael Shinar, Mordechai Pras, Elon Pras*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The penetrance of the p.[Met694Val];[Met694Val] genotype of pyrin in adult familial Mediterranean fever (FMF) patients is close to 100%. Disease penetrance of the p.[Met694Val];[Glu148Gln] genotype (M694V/E148Q), and the heterozygous p.[Met694Val];[=] genotype is unknown. A difference in the penetrance of the latter two may indicate functionality for the p.Glu148Gln variant. We performed a penetrance estimation study using controls and patients of North African Jewish (NAJ) decent. FMF in this population is highly prevalent and mutation frequencies are well known. The ratio between the calculated frequencies of the three genotypes obtained from the control cohort and the actual frequency obtained from the patient cohort were used to determine the penetrance of p.[Met694Val];[Glu148Gln] and p.[Met694Val];[=]. We found a penetrance of 0.135 and 0.008 for p.[Met694Val];[Glu148Gln] and p.[Met694Val];[=], respectively. Thus, the penetrance of p.[Met694Val];[Glu148Gln] is more than 17 times higher than p.[Met694Val];[=], indicating an active role for p.Glu148Gln when combined with p.Met694Val.

Original languageEnglish
Pages (from-to)1866-1870
Number of pages5
JournalHuman Mutation
Issue number11
StatePublished - 1 Nov 2020


  • E148Q
  • M694V
  • familial Mediterranean fever
  • genotypes
  • penetrance


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