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Updated: Mar 9, 2026
Merkel Cell Polyomavirus Infection and Detection
Published on: February 7, 2019
Human polyomavirus 6 and 7 are associated with pruritic and dyskeratotic dermatoses
Khang D Nguyen1, Eunice E Lee1, Yangbo Yue1
1Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, Texas.
Background:
Human polyomavirus (HPyV)6 and HPyV7 are shed chronically from human skin. HPyV7, but not HPyV6, has been linked to a pruritic skin eruption of immunosuppression.
Objective:
We determined whether biopsy specimens showing a characteristic pattern of dyskeratosis and parakeratosis might be associated with polyomavirus infection.
Methods:
We screened biopsy specimens showing "peacock plumage" histology by polymerase chain reaction for HPyVs. Cases positive for HPyV6 or HPyV7 were then analyzed by immunohistochemistry, electron microscopy, immunofluorescence, quantitative polymerase chain reaction, and complete sequencing, including unbiased, next-generation sequencing.
Results:
We identified 3 additional cases of HPyV6 or HPyV7 skin infections. Expression of T antigen and viral capsid was abundant in lesional skin. Dual immunofluorescence staining experiments confirmed that HPyV7 primarily infects keratinocytes. High viral loads in lesional skin compared with normal-appearing skin and the identification of intact virions by both electron microscopy and next-generation sequencing support a role for active viral infections in these skin diseases.
Limitation:
This was a small case series of archived materials.
Conclusion:
We have found that HPyV6 and HPyV7 are associated with rare, pruritic skin eruptions with a distinctive histologic pattern and describe this entity as "HPyV6- and HPyV7-associated pruritic and dyskeratotic dermatoses."
Insights
Human polyomaviruses (HPyV)6 and HPyV7 are linked to rare, itchy skin conditions. These viral skin infections present with a distinct histologic pattern, now termed HPyV6- and HPyV7-associated pruritic and dyskeratotic dermatoses.
Area of Science:
- Dermatology
- Virology
- Pathology
Background:
- Human polyomaviruses (HPyV)6 and HPyV7 are chronically shed from human skin.
- HPyV7 is associated with pruritic skin eruptions in immunosuppressed individuals.
Purpose of the Study:
- To investigate the association between polyomavirus infection and a specific histological pattern in skin biopsy specimens characterized by dyskeratosis and parakeratosis.
Main Methods:
- Screening of skin biopsy specimens with "peacock plumage" histology for HPyVs using PCR.
- Analysis of HPyV6 or HPyV7 positive cases via immunohistochemistry, electron microscopy, immunofluorescence, qPCR, and next-generation sequencing.
Main Results:
- Three additional cases of HPyV6 or HPyV7 skin infections were identified.
- Abundant expression of viral T antigen and capsid in lesional skin, with HPyV7 primarily infecting keratinocytes.
- High viral loads and identification of intact virions support active viral roles in these skin diseases.
Conclusions:
- HPyV6 and HPyV7 are associated with rare pruritic skin eruptions exhibiting a distinctive histologic pattern.
- This condition is described as "HPyV6- and HPyV7-associated pruritic and dyskeratotic dermatoses."
- Findings based on a small series of archived cases.
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