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Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE121145 | GEO | 2018/12/31

REPOSITORIES: GEO

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Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (RNA-Seq)

Project description:We assessed differential gene expression using RNAseq in intestinal adenomas between Apc loss-of-function (Apcmin) mice, or by Apc1322T mice encoding a partially-functional Apc truncation commonly found in colorectal carcinomas.

2018-12-31 | GSE121142 | GEO

Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (Illumina Beadchip)

Project description:Bcl9 and Pygo function within the Wnt enhanceosome to effect β-catenin-dependent transcription. Whether they also mediate β-catenin-dependent neoplasia is unclear. Here we assess their roles in intestinal tumorigenesis initiated by Apc loss-of-function (ApcMin). Gene expression profiling revealed that loss-of-Bcl9 synergizes with loss-of-Pygo to shift gene expression within Apc-mutant adenomas from stem cell-like to differentiation along Notch-regulated secretory lineages.

2018-12-31 | GSE121130 | GEO

Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis

Project description:Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis

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Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (RNA-Seq)

Project description:Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (RNA-Seq)

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Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (Illumina Beadchip)

Project description:Bcl9 and Pygo synergize downstream of Apc to effect intestinal neoplasia in mouse models recapitulating Familial Adenomatous Polyposis (Illumina Beadchip)

| PRJNA495815 | ENA

Bcl9 and Pygo synergise downstream of Apc to effect intestinal neoplasia in FAP mouse models.

Project description:Bcl9 and Pygo are Wnt enhanceosome components that effect β-catenin-dependent transcription. Whether they mediate β-catenin-dependent neoplasia is unclear. Here we assess their roles in intestinal tumourigenesis initiated by Apc loss-of-function (ApcMin), or by Apc1322T encoding a partially-functional Apc truncation commonly found in colorectal carcinomas. Intestinal deletion of Bcl9 extends disease-free survival in both models, and essentially cures Apc1322T mice of their neoplasia. Loss-of-Bcl9 synergises with loss-of-Pygo to shift gene expression within Apc-mutant adenomas from stem cell-like to differentiation along Notch-regulated secretory lineages. Bcl9 loss also promotes tumour retention in ApcMin mice, apparently via relocating nuclear β-catenin to the cell surface, but this undesirable effect is not seen in Apc1322T mice whose Apc truncation retains partial function in regulating β-catenin. Our results demonstrate a key role of the Wnt enhanceosome in β-catenin-dependent intestinal tumourigenesis and reveal the potential of BCL9 as a therapeutic target during early stages of colorectal cancer.

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Pathogenic APC Variants in Latvian Familial Adenomatous Polyposis Patients.

Project description:Background and objectives: Familial adenomatous polyposis is one of the APC-associated polyposis conditions described as genetically predetermined colorectal polyposis syndrome with a variety of symptoms. The purpose of this study was to determine sequence variants of the APC gene in patients with familial adenomatous polyposis (FAP) phenotype and positive or negative family history. Materials and Methods: Eight families with defined criteria of adenomatous polyposis underwent molecular genetic testing. Coding regions and flanking intron regions of the APC gene were analyzed by Sanger sequencing. Results: Eight allelic variants of the APC gene coding sequence were detected. All allelic variants of the APC gene were predicted to be pathogenic based on criteria according to the "Joint Consensus Recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology" (2015), four of them c.1586_1587insAT, c.2336delT, c.3066_3067insGA, and c.4303_4304insC, were considered novel. Conclusions: The timely molecular genetic analysis of APC germline variants and standardized interpretation of the pathogenicity of novel allelic variants has a high impact on choice for treatment, cancer prevention, and family genetic counseling.

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APC gene mutations in Chinese familial adenomatous polyposis patients.

Project description:AimTo study the characteristics of APC (adenomatous polyposis coli) gene germline mutation in Chinese patients with familial adenomatous polyposis (FAP).MethodsAPC gene from 14 FAP families was amplified by polymerase chain reaction (PCR) and underwent direct sequencing to determine the micromutation type. For the samples without micromutation, the large fragment deletion of APC gene was examined by multiplex ligation-dependent probe amplification (MLPA).ResultsThere were gene micromutations in 9 families with a micromutation detection rate of 64.3% (9/14), including 6 frameshift mutations (66.7%), 1 nonsense mutation (11.1%) and 2 splicing mutations (22.2%). Large fragment deletions were detected by MLPA in 2 families. The total mutation detection rate of micromutations and large fragment deletions was 78.6% (11/14).ConclusionThe detection rate of APC gene germline mutation can be improved by direct sequencing combined with MLPA large fragment deletion detection.

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APC transcription studies and molecular diagnosis of familial adenomatous polyposis.

Project description:Familial adenomatous polyposis (FAP) is characterised by the development of hundreds to thousands of colorectal adenomas and results from inherited or somatic mosaic variants in the APC gene. Index patients with suspected FAP are usually investigated by APC coding region sequence and dosage analysis in a clinical diagnostic setting. The identification of an APC variant which is predicted to alter protein function enables predictive genetic testing to guide the management of family members. This report describes a 4-generation family with a phenotype consistent with FAP, but in which an APC variant had not been identified, despite testing. To explore this further, quantitative PCR (qPCR) was employed to assess APC transcription, demonstrating reduced levels of APC RNA. Next generation sequencing (NGS) identified the APC 5'UTR/ Exon 1 variant, c.-190 G>A, that had been reported previously in an another FAP family with APC allelic imbalance. Quantitative RNA studies and DNA sequencing of the APC promoters/ Exon 1 may be useful diagnostically for patients with suspected FAP when coding region variants cannot be identified.

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Wild-type APC Influences the Severity of Familial Adenomatous Polyposis.

Project description: Not available

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