Shifted assembly and function of mSWI/SNF family subcomplexes underlie targetable dependencies in endometriod carcinomas

The mammalian SWI/SNF (mSWI/SNF) family of chromatin remodelers govern cell type-specific chromatin accessibility and gene expression and assemble as three distinct complexes: canonical BAF (cBAF), Polybromo-associated BAF (PBAF), and non-canonical BAF (ncBAF). ARID1A and ARID1B are paralog subunits that specifically nucleate the assembly of cBAF complexes and are frequently dual deleted in highly aggressive differentiated endometrial carcinomas (DECs). Here, in cellular models and primary human tumors, we find that ARID1A/B-mediated cBAF loss results in increased ncBAF and PBAF biochemical abundance and function genome-wide to maintain the DEC oncogenic signature. Further, treatment of ARID1A/1B-mutant cell lines and PDX models in vivo with a clinical-grade SMARCA4/2 ATPase inhibitor, FHD-286, markedly attenuates cell proliferation and tumor growth, and synergizes with carboplatin-based chemotherapy. Taken together, these findings reveal the oncogenic contributions of shifted of mSWI/SNF family complex abundance and chromatin-level gene regulatory functions and suggest therapeutic utility of mSWI/SNF complex small molecule inhibitors in dedifferentiated endometrial carcinoma and other cBAF-disrupted cancer types.

Type: Cancer Genomics
Archiver: European Genome-Phenome Archive (EGA)

3 Datasets

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Dataset ID	Description	Technology	Samples
EGAD50000001471	Raw and processed RNA-seq data from a patient-derived xenograft (yielding 18 samples) and the VOA1066 undifferentiated endometrial carcinoma cell-line (yielding 15 samples). PDX samples were treater with either compound-14, dBRD9, or were untreated. VOA1066 samples were treated with either compound-12, dBRD9, or were untreated. Samples were sequenced on an Illumina NextSeq 500 using 37-bp single-end sequencing. Raw fastq files and gene count tables are included for each sample.	NextSeq 500	33
EGAD50000001472	Raw and processed ATAC-seq data from the VOA1066 undifferentiated endometrial carcinoma cell-line (10 samples). Samples were treated with DMSO, dBRD9, or compound 12, without doxycycline; some samples instead received doxycycline-induced ARID1A treatment, or doxycycline alone. Samples were sequenced on Illumina NextSeq 500 using 37 bp paired-end sequencing parameters. Raw fastq fastq files, bigwig files giving normalized genomic coverage per region, and called broad peaks are included for each sample.	NextSeq 500	10
EGAD50000001473	ChIP-seq data of 18 samples from the VOA1066 undifferentiated endometrial carcinoma cell-line with various pulldowns: BRG1 (abcam, ab110642, GR3255117-11), BRD9 (CST, E4Q3F, Lot 1), ARID1A (CST, D2A8U, Lot 4), SS18 (CST, D6I4Z, Lot 1), PBRM1 (CST, D3F70, Lot 3), GLTSCR1 (CST, E6I3A, Lot 1), H3K27ac (CST, C36B11, Lot 16), or none. Sample were either untreated or received doxycycline-induced ARID1A treatment. Samples were sequenced on Illumina NextSeq 500 using 37 bp single-end sequencing parameters. Raw fastq files, along with processed bigwig files containing normalized genomic coverage, and called narrow peaks, are included for each sample.	NextSeq 500	18