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Updated: Apr 16, 2026

Formaldehyde-assisted Isolation of Regulatory Elements to Measure Chromatin Accessibility in Mammalian Cells

Formaldehyde-assisted Isolation of Regulatory Elements to Measure Chromatin Accessibility in Mammalian Cells

Published on: April 2, 2018

BLM protein mitigates formaldehyde-induced genomic instability.

Anuradha Kumari¹, Nichole Owen², Eleonora Juarez²

¹Oregon Institute of Occupational Health Sciences, Oregon Health & Science University, Portland, OR 97239 USA; Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR 97239 USA.

|March 16, 2015

Summary

This summary is machine-generated.

Bloom (BLM) protein is crucial for repairing DNA damage and maintaining genomic stability after formaldehyde exposure. Its absence leads to increased sensitivity, cell cycle arrest, and delayed DNA repair, highlighting BLM

Keywords:

53BP1 ATM BLM Double-strand breaks Formaldehyde

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Area of Science:

Molecular Biology
Genetics
Toxicology

Background:

Formaldehyde is a known human carcinogen with occupational and environmental exposure concerns.
Mechanisms of formaldehyde-induced genomic instability and cellular tolerance are not fully understood.
Bloom (BLM) is a key protein involved in maintaining genome stability.

Purpose of the Study:

To investigate the role of Bloom (BLM) in mitigating formaldehyde-induced cellular and genetic abnormalities.
To elucidate the interaction of BLM with other DNA repair proteins in response to formaldehyde.

Main Methods:

Cellular sensitivity assays and cell cycle analysis in BLM-deficient and wild-type cells exposed to formaldehyde.
Live-cell imaging to observe cell division and chromosome segregation.
Immunofluorescence microscopy to detect DNA double-strand break markers (53BP1, γH2AX) and BLM foci.

Main Results:

BLM-deficient cells showed increased sensitivity, cell cycle arrest, and chromosome aberrations upon formaldehyde exposure.
Formaldehyde-treated cells require BLM for proper daughter cell segregation.
BLM-deficient cells exhibited delayed repair of formaldehyde-induced DNA double-strand breaks (DSBs), with observed co-localization of ATM, 53BP1, and BLM at DSB sites.

Conclusions:

BLM plays a critical role in cellular responses to formaldehyde, including DNA repair and tolerance.
Functional interactions between ATM, 53BP1, and BLM are essential for responding to formaldehyde-induced DNA damage.
Understanding these interactions provides insights into formaldehyde's genotoxicity and cellular defense mechanisms.