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Merkel Cell Polyomavirus Infection and Detection
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Merkel Cell Polyomavirus Infection and Detection

Published on: February 7, 2019

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Merkel cell polyomavirus small T antigen induces genome instability by E3 ubiquitin ligase targeting

H J Kwun1, J A Wendzicki1, Y Shuda1

  • 1Cancer Virology Program, University of Pittsburgh, Pittsburgh, PA, USA.

Oncogene
|August 29, 2017
PubMed

Insights

Merkel cell polyomavirus (MCV) small T oncoprotein disrupts cell division by causing extra centrosomes and DNA errors. This viral oncoprotein

Area of Science:

  • Cell Biology
  • Virology
  • Cancer Research

Background:

  • Proper mitotic spindle formation is crucial for accurate DNA segregation during cell division.
  • Cancer cells often exhibit genomic instability due to disrupted cellular signaling.
  • Merkel cell polyomavirus (MCV) is implicated in Merkel cell carcinoma, a rare but aggressive skin cancer.

Purpose of the Study:

  • To investigate the molecular mechanisms by which the MCV small T (sT) oncoprotein contributes to genomic instability.
  • To understand how viral oncoproteins can interfere with host cell machinery regulating chromosome stability.

Main Methods:

  • Analysis of MCV sT oncoprotein's interaction with cellular ligases.
  • Assessment of centrosome duplication, aneuploidy, and micronuclei formation in cells expressing MCV sT.
  • Investigation of MCV large T oncoprotein turnover.

Main Results:

  • MCV sT oncoprotein induces centrosome overduplication and aneuploidy.
  • MCV sT targets cellular ligases, leading to chromosome breakage and micronuclei formation.
  • The sT domain of MCV sT inhibits the turnover of the MCV large T oncoprotein.

Conclusions:

  • MCV sT oncoprotein disrupts cell division and promotes genomic instability through its E3 ligase targeting capacity.
  • These disruptions may play a significant role in the development of Merkel cell carcinoma.
  • Viral oncoproteins can subvert host cell processes to drive cancer initiation and progression.

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