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Summary

Background  Inherited isolated nail anomaly manifesting with onychauxis and onycholysis is a rare condition, caused by mutations in the gene FZD6, encoding membrane-bound Wnt receptor protein.

Objectives  To search for sequence variants in the gene FZD6 in three individuals of a consanguineous family exhibiting features of nail dysplasia.

Methods  Linkage in the family was searched by genotyping microsatellite markers linked to the gene FZD6, mapped at chromosome 8q22.3. Exons and splice junction sites of the gene FZD6 were polymerase chain reaction amplified and sequenced in an automated DNA sequencer.

Results  DNA sequence analysis revealed a novel homozygous missense mutation (c.1266G>A; p.Gly422Asp) located in the transmembrane domain of the protein FZD6.

Conclusions  The missense mutation (p.Gly422Asp), identified here, is only the third mutation detected in the gene FZD6.