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Related Experiment Video

Updated: Jun 20, 2026

Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction

Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction

Published on: July 12, 2022

HMGA1 levels influence mitochondrial function and mitochondrial DNA repair efficiency.

Li Mao¹, Kelsey J Wertzler, Scott C Maloney

¹School of Molecular Biosciences, Washington State University, Biotechnology/Life Sciences Bldg., Rm. 143, Pullman, WA 99164-4660, USA.

Molecular and Cellular Biology

|August 19, 2009

Summary

High mobility group A (HMGA) proteins, overexpressed in cancer, regulate mitochondrial DNA and mass. Elevated HMGA1 increases reactive oxygen species and impairs mtDNA repair, promoting cancer mutations.

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Published on: July 12, 2022

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Area of Science:

Molecular Biology
Cancer Research
Cell Biology

Background:

High mobility group A (HMGA) proteins are gene regulatory factors typically found at low concentrations in normal cells but overexpressed in cancers.
HMGA1, a specific HMGA protein, normally shuttles to mitochondria during late cell cycle phases but is aberrantly localized in cancer cells.

Purpose of the Study:

To investigate the functional role of HMGA1 in regulating mitochondrial parameters within cancer cells.
To determine the impact of HMGA1 overexpression on mitochondrial DNA (mtDNA) levels, mitochondrial mass, and oxidative stress.

Main Methods:

Utilized a genetically engineered human MCF-7 cell line with controllable transgenic HMGA1 expression.
Performed time-course experiments to "turn-ON" and "turn-OFF" HMGA1 levels, monitoring mitochondrial changes.
Assessed mtDNA levels, mitochondrial mass, reactive oxygen species (ROS) production, and mtDNA repair efficiency.

Main Results:

Mitochondrial DNA levels and mitochondrial mass showed an inverse correlation with HMGA1 concentrations.
Elevated HMGA1 expression led to increased cellular reactive oxygen species (ROS) levels.
The efficiency of repairing oxidatively damaged mtDNA was significantly decreased in cells with high HMGA1 levels.

Conclusions:

HMGA1 plays a crucial role in regulating mitochondrial DNA and mass.
Increased HMGA1 contributes to mitochondrial dysfunction by elevating ROS and impairing mtDNA repair.
These HMGA1-induced mitochondrial alterations likely promote the accumulation of mtDNA mutations observed in cancer.