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Updated: Jul 9, 2025
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Published on: May 24, 2019
Super-resolution microscopy reveals the nanoscale cluster architecture of the DEK protein cancer biomarker
Agnieszka Pierzynska-Mach1, Alberto Diaspro1,2, Francesca Cella Zanacchi1,3,4
1Nanoscopy and NIC@IIT, Istituto Italiano di Tecnologia, 16152 Genoa, Italy.
Abstract:
DEK protein, a key chromatin regulator, is strongly overexpressed in various forms of cancer. While conventional microscopy revealed DEK as uniformly distributed within the cell nucleus, advanced super-resolution techniques uncovered cluster-like structures. However, a comprehensive understanding of DEK's cellular distribution and its implications in cancer and cell growth remained elusive. To bridge this gap, we employed single-molecule localization microscopy (SMLM) to dissect DEK's nanoscale organization in both normal-like and aggressive breast cancer cell lines. Our investigation included characteristics such as localizations per cluster, cluster areas, and intra-cluster localization densities (ICLDs). We elucidated how cluster features align with different breast cell types and how chromatin decompaction influences DEK clusters in these contexts. Our results indicate that DEK's intra-cluster localization density and nano-organization remain preserved and not significantly influenced by protein overexpression or chromatin compaction changes. This study advances the understanding of DEK's role in cancer and underscores its stable nanoscale behavior.
Insights
The DEK protein
Area of Science:
- Cellular and Molecular Biology
- Cancer Research
- Chromatin Biology
Background:
- DEK protein is a crucial chromatin regulator overexpressed in many cancers.
- Previous microscopy showed uniform nuclear DEK distribution, but super-resolution revealed clusters.
- The precise nanoscale organization of DEK and its role in cancer remained unclear.
Purpose of the Study:
- To investigate the nanoscale organization of DEK protein in normal and cancerous breast cells.
- To analyze DEK cluster characteristics like density and area.
- To determine how DEK organization is affected by overexpression and chromatin changes.
Main Methods:
- Single-molecule localization microscopy (SMLM) was used to visualize DEK at the nanoscale.
- Analysis included localizations per cluster, cluster area, and intra-cluster localization densities (ICLDs).
- Studies were conducted in normal-like and aggressive breast cancer cell lines.
Main Results:
- DEK protein forms distinct nanoscale clusters within the cell nucleus.
- DEK's intra-cluster localization density and overall nano-organization are stable.
- These features are not significantly altered by DEK overexpression or chromatin compaction changes.
Conclusions:
- DEK protein exhibits stable nanoscale organization irrespective of cellular context or overexpression.
- This stable nano-organization is a key characteristic of DEK's function in cancer and cell growth.
- The findings provide new insights into DEK's role in oncogenesis.
