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Related Concept Videos

Telomeres and Telomerase02:41

Telomeres and Telomerase

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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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Detecting telomerase activity at the single-cell level using a CRISPR-Cas12a-based chip.

Yateng Jiang1, Yanping Wang2, Wen Luo1

  • 1College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing 210023, China. ysong@nju.edu.cn.

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This study introduces a novel method for detecting telomerase activity at the single-cell level. The ultrasensitive assay combines MOF-DNA barcodes and CRISPR-Cas12a technology for improved cancer diagnosis.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Nanotechnology

Background:

  • Telomerase activity is closely linked to cancer development and progression.
  • Accurate detection of telomerase is crucial for cancer diagnosis and treatment.
  • Current methods face challenges in achieving single-cell resolution for telomerase detection.

Purpose of the Study:

  • To develop an ultrasensitive method for detecting telomerase activity at the single-cell level.
  • To integrate a Metal-Organic Framework (MOF)-DNA barcode system with CRISPR-Cas12a for enhanced signal amplification.
  • To combine this assay with a microfluidic chip for single-cell analysis.

Main Methods:

  • Utilized DNA-functionalized UiO-66 nanoparticles as signal transducers.
  • Converted telomerase activity into DNA activation strands.
  • Employed CRISPR-Cas12a's trans-cleavage activity for signal amplification.
  • Integrated the assay onto a single-cell microfluidic chip.

Main Results:

  • Achieved ultrasensitive detection of telomerase activity.
  • Demonstrated successful single-cell level analysis.
  • The MOF-DNA-CRISPR-Cas12a system effectively amplified the telomerase signal.
  • The microfluidic integration enabled high-throughput single-cell detection.

Conclusions:

  • The developed MOF-DNA barcode-amplified CRISPR-Cas12a strategy offers a highly sensitive approach for single-cell telomerase activity detection.
  • This method holds significant promise for early cancer diagnosis.
  • The integration with microfluidics paves the way for advanced single-cell diagnostics.