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Updated: Oct 2, 2025
Merkel Cell Polyomavirus Infection and Detection
Published on: February 7, 2019
Prevalence of MCPyV, HPyV6, HPyV7 and TSPyV in Actinic Keratosis Biopsy Specimens
Carla Prezioso1,2, Gabriele Brazzini2, Sara Passerini2
1IRCSS San Raffaele Roma, Microbiology of Chronic Neuro-Degenerative Pathologies, 00163 Rome, Italy.
Abstract:
To date, 14 human polyomaviruses (HPyVs) have been identified using high-throughput technologies. Among them, MCPyV, HPyV6, HPyV7 and TSPyV present a skin tropism, but a causal role in skin diseases has been established only for MCPyV as a causative agent of Merkel cell carcinoma (MCC) and TSPyV as an etiological agent of Trichodysplasia Spinulosa (TS). In the search for a possible role for cutaneous HPyVs in the development of skin malignant lesions, we investigated the prevalence of MCPyV, HPyV6, HPyV7 and TSPyV in actinic keratosis (AK), a premalignant skin lesion that has the potential to progress towards a squamous cell carcinoma (SCC). One skin lesion and one non-lesion skin from nine affected individuals were analyzed by qualitative PCR. MCPyV was detected in 9 out of 9 lesion biopsies and 6 out of 8 non-lesion biopsies. HPyV6 was detected only in healthy skin, while HPyV7 and TSPyV were not detected in any skin sample. These findings argue against a possible role of cutaneous HPyVs in AK. However, considering the small sample size analyzed, a definitive conclusion cannot be drawn. Longitudinal studies on large cohorts are warranted.
Insights
This study investigated human polyomaviruses (HPyVs) in actinic keratosis (AK). Findings suggest MCPyV is not a primary cause of AK, though more research is needed.
Area of Science:
- Dermatology
- Virology
- Oncology
Background:
- Four human polyomaviruses (HPyVs) exhibit skin tropism: MCPyV, HPyV6, HPyV7, and TSPyV.
- MCPyV is linked to Merkel cell carcinoma (MCC), and TSPyV to Trichodysplasia Spinulosa (TS).
- The role of cutaneous HPyVs in premalignant skin lesions like actinic keratosis (AK) remains unclear.
Purpose of the Study:
- To determine the prevalence of MCPyV, HPyV6, HPyV7, and TSPyV in actinic keratosis (AK) lesions.
- To investigate the potential involvement of these HPyVs in the progression of AK to squamous cell carcinoma (SCC).
Main Methods:
- Qualitative PCR analysis of skin lesion and non-lesion samples from nine AK patients.
- Detection of MCPyV, HPyV6, HPyV7, and TSPyV DNA.
Main Results:
- MCPyV was detected in all AK lesion biopsies (9/9) and most non-lesion biopsies (6/8).
- HPyV6 was found only in healthy skin samples.
- HPyV7 and TSPyV were not detected in any analyzed skin samples.
Conclusions:
- The presence of MCPyV in AK lesions does not strongly support its role as a causative agent in AK development.
- Current data suggest cutaneous HPyVs, including MCPyV, may not be significantly involved in the pathogenesis of AK.
- Further longitudinal studies with larger cohorts are necessary to definitively ascertain the role of HPyVs in AK.
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