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SMARCB1 missense mutants disrupt SWI/SNF complex stability and remodeling activity.

Garrett W Cooper^1,2, Benjamin P Lee^1,2, Won Jun Kim^3,4

¹Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA.

Nature Communications

|April 8, 2026

Summary

Missense mutations in SMARCB1 disrupt its anti-proliferation function by destabilizing the SWI/SNF complex, impacting gene regulation. These defects occur even with detectable protein, challenging current diagnostic methods for pediatric cancers.

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Area of Science:

Molecular Biology
Genetics
Cancer Biology

Background:

The SWItch/Sucrose Non-Fermentable (SWI/SNF) complex is crucial for gene expression via nucleosome remodeling.
The SMARCB1 subunit is essential for SWI/SNF complex function and is frequently inactivated in pediatric cancers.
The impact of SMARCB1 missense mutations on function is not well understood, and diagnostics often overlook mutation status.

Purpose of the Study:

To comprehensively assess the functional impact of SMARCB1 alterations using deep mutational scanning.
To investigate how missense mutations affect SMARCB1's role in chromatin remodeling and cancer.

Main Methods:

Deep mutational scanning of 8418 SMARCB1 alterations.
Functional assays to assess anti-proliferation activity, SWI/SNF complex stability, and chromatin remodeling.
Comparison of missense mutations to nonsense mutations.

Main Results:

Missense mutations in SMARCB1 impair its anti-proliferation function, comparable to nonsense mutations.
These mutations destabilize the SWI/SNF complex, affecting chromatin remodeling and transcriptional regulation.
Functional defects persist despite detectable SMARCB1 protein expression, challenging immunohistochemistry-based diagnostics.

Conclusions:

SMARCB1 missense mutations have significant functional consequences in pediatric malignancies.
Current diagnostic reliance on immunohistochemistry for SMARCB1 may be insufficient due to retained protein expression with functional defects.
A deeper understanding of SMARCB1 mutation status is critical for accurate cancer diagnosis and classification.