The protein long interspersed nuclear elements-1 (LINE-1) serves as a useful surrogate marker of global methylation but little is known for Merkel cell carcinoma. LINE-1 expression was found only in Merkel cell polyomavirus (MCPyV)-positive Merkel cell carcinomas but not in MCPyV-negative Merkel cell carcinomas, suggesting that epigenetic dysregulation may be associated with MCPyV expression.
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