Seborrheic keratoses (SK) represent the most frequent benign epidermal tumors in clinical dermatology. Clinicians encounter these lesions daily, yet their exact pathogenesis remains a topic of active research. Recent clinical investigations identify specific seborrheic keratoses genetic factors that predispose individuals to a high lesion burden. Specifically, DNA repair gene polymorphisms play a crucial role in this biological process. Consequently, understanding these markers helps doctors categorize patient risk more effectively.

A recent study by Ciobotariu and colleagues examined the relationship between SK and polymorphisms in DNA repair genes. Researchers utilized a case-control design to evaluate patients with varying counts of these benign tumors. Notably, the rs25487 polymorphism in the XRCC1 gene demonstrated a significant association with the presence of over 50 lesions. Patients carrying this genetic variant faced more than three times the risk compared to those with fewer lesions. Moreover, this genetic susceptibility suggests that impaired DNA repair mechanisms might drive the clonal expansion of keratinocytes.

Understanding Seborrheic Keratoses Genetic Factors

In addition to specific gene variants, environmental and phenotypic traits significantly influence the development of these tumors. Increasing age remains the most consistent epidemiological factor, as the risk rises progressively in older populations. Furthermore, the study highlighted that individuals with lighter skin types, specifically phototypes I and II, are more susceptible. Therefore, the combination of ultraviolet (UV) exposure and genetic predisposition likely creates a metabolic environment conducive to lesion development. However, clinicians should remember that these lesions remain genetically stable despite harboring numerous somatic mutations.

The association between SK and other skin conditions, such as melanoma, also warrants clinical attention. Although SKs are benign, a high lesion count may signal a broader susceptibility to UV-induced damage. Consequently, these lesions occasionally serve as markers in paraneoplastic syndromes or as indicators of extensive cumulative sun damage. Furthermore, clinicians can use these findings to provide more personalized counseling to patients regarding sun protection and long-term skin health monitoring.

What is the most significant genetic variant linked to many seborrheic keratoses?

Recent research indicates that the rs25487 polymorphism in the XRCC1 gene is a major factor. Individuals with this variant often present with more than 50 seborrheic keratoses during clinical examination.

Do skin phototypes affect the risk of developing these lesions?

Yes, skin phototypes I and II are more frequently associated with a high number of lesions. This occurs because lighter skin is generally more susceptible to damage from ultraviolet radiation.

Are seborrheic keratoses dangerous if they are caused by genetic mutations?

No, despite harboring mutations like those in the FGFR3 or PIK3CA genes, seborrheic keratoses are benign. They lack the biological potential to transform into malignant skin cancers.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a substitute for professional healthcare. Refer to the latest local and national guidelines for clinical practice.

References

1. Ciobotariu I et al. DNA Repair Gene Polymorphisms as Genetic Factors Associated with Presence of Seborrheic Keratoses. Dermatology. 2026 Mar 08. doi: 10.1159/000551368. PMID: 41795822.

2. Heidenreich B et al. Genetic alterations in seborrheic keratoses. Oncotarget. 2017 May 30;8(22):36639-36655. doi: 10.18632/oncotarget.16698.

3. Medscape. Seborrheic Keratosis: Pathophysiology and Etiology. Updated 2026. Available at: https://reference.medscape.com/article/1059477-overview.