We identified a de novo mutation in the peripheral myelin protein (PMP22) gene of a patient with Déjérine‐Sottas neuropathy. Single‐stranded conformation analysis of PCR‐amplified DNA fragments showed an additional fragment for exon 1 in the patient, which was absent in the unaffected parents. Sequence analysis showed a de novo point mutation C85→A that results in an amino acid substitution Hisl2Gln in the first transmembrane domain of PMP22. This provides further evidence that sporadic cases of Déjérine‐Sottas neuropathy can be due to dominant single base substitutions.© 1995 wiley‐Liss, Inc.
- De novo mutation