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Letter to the Editor| Volume 103, ISSUE 2, P116-119, August 2021

Updated allele frequencies of SERPINB7 founder mutations in Asian patients with Nagashima-type palmoplantar keratosis/keratoderma

      Highlights

      • We reported 14 NPPK patients with biallelic SERPINB7 mutations, including one novel mutation p.Trp145Ser.
      • The mutant allele frequency of the East Asian SERPINB7 founder mutation c.796C>T was 0.536 in the present 14 NPPK patients.
      • 11 of the 14 (78.6 %) NPPK patients had the founder mutation.
      • NPPK families with the founder mutation accounted for 85.9 % of the previously reported and present Japanese NPPK families.
      • NPPK families with the founder mutation accounted for 87.6 % (78/89 families) of East Asian NPPK families.
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