Pachyonychia Congenita Clinical Features and Genetic Insights

Pachyonychia congenita is a rare autosomal dominant genodermatosis characterised by hypertrophic nail dystrophy, painful focal palmoplantar keratoderma and often oral leukokeratosis, follicular keratosis and epidermal cysts. Clinical severity varies with the specific keratin gene mutated—KRT6A, KRT6B, KRT6C, KRT16 or KRT17—each encoding intermediate filaments essential to epithelial integrity. The hallmark painful plantar lesions profoundly impair mobility and quality of life, while nail changes may appear at birth or develop in infancy. Emerging evidence reveals that mutation position within the keratin rod domain correlates with phenotype intensity and onset age. Germline mosaicism, though uncommon, has been documented, underscoring complexities in genetic counselling and recurrence risk. Advances in molecular diagnosis via next-generation sequencing have expanded the mutational spectrum and refined genotype–phenotype correlations. Insight into pain pathogenesis implicates neurocutaneous interactions and aberrant keratinocyte signalling. These discoveries are guiding translational approaches, including targeted small-molecule inhibitors and surgical interventions aimed at symptom relief and functional restoration. The global registry of affected individuals continues to inform natural history, support therapeutic trials and foster patient empowerment through self-care education.

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Pachyonychia Congenita Clinical Features and Genetic Insights publication trend

The graph below shows the total number of articles in pachyonychia congenita clinical features and genetic insights across all publications each year (not limited to Nature Index journals).

Technical terms

Keratin genes: Genes encoding structural proteins in epithelial cells that form intermediate filaments critical for skin and nail integrity.

Palmoplantar keratoderma: Thickening of the skin on the palms and soles, often painful, resulting from hyperproliferation of keratinocytes.

Nail dystrophy: Malformation or excessive growth of nails due to disrupted keratin filament assembly in the nail matrix.

Germline mosaicism: Presence of a genetic mutation in a subset of reproductive cells, leading to variable inheritance patterns without parental symptoms.

References

1. The molecular genetic analysis of the expanding pachyonychia congenita case collection. British Journal of Dermatology (2014).
2. Treatment of Painful Palmoplantar Keratoderma Related to Pachyonychia Congenita Using EGFR Inhibitors. Biomedicines (2022).
3. Pachyonychia congenita: pathogenesis of pain and approaches to treatment. Clinical and Experimental Dermatology (2024).
4. A KRT6A mutation p.Ile462Asn in a Chinese family with pachyonychia congenita, and identification of maternal mosaicism: a case report. BMC Medical Genomics (2021).
5. Surgical Management of Pachyonychia Congenita in a 3-Year-Old. Archives of Plastic Surgery (2023).