3-41224995-C-T

Variant names:

• chr3-41224995-C-T
• rs775104326
• NM_001904.4:c.283C>T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001904.4(CTNNB1):​c.283C>T​(p.Arg95*) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CTNNB1 NM_001904.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 3.87

Genes affected

CTNNB1 (HGNC:2514): (catenin beta 1) The protein encoded by this gene is part of a complex of proteins that constitute adherens junctions (AJs). AJs are necessary for the creation and maintenance of epithelial cell layers by regulating cell growth and adhesion between cells. The encoded protein also anchors the actin cytoskeleton and may be responsible for transmitting the contact inhibition signal that causes cells to stop dividing once the epithelial sheet is complete. Finally, this protein binds to the product of the APC gene, which is mutated in adenomatous polyposis of the colon. Mutations in this gene are a cause of colorectal cancer (CRC), pilomatrixoma (PTR), medulloblastoma (MDB), and ovarian cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2016]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-41224995-C-T is Pathogenic according to our data. Variant chr3-41224995-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 265443.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr3-41224995-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTNNB1	NM_001904.4	c.283C>T	p.Arg95*	stop_gained	Exon 4 of 15	ENST00000349496.11	NP_001895.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTNNB1	ENST00000349496.11	c.283C>T	p.Arg95*	stop_gained	Exon 4 of 15	1	NM_001904.4	ENSP00000344456.5
CTNNB1	ENST00000645982.1	c.283C>T	p.Arg95*	stop_gained	Exon 4 of 16			ENSP00000494845.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Jan 04, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29575536, 27915094, 27959697, 28191889, 33004838, 25326669) -

May 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg95*) in the CTNNB1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CTNNB1 are known to be pathogenic (PMID: 23033978, 24614104, 25326669, 26350204, 28575650). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with clinical features of intellectual disability syndrome (PMID: 25326669, 27959697). ClinVar contains an entry for this variant (Variation ID: 265443). For these reasons, this variant has been classified as Pathogenic. -

Oct 23, 2020

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

CTNNB1-related disorder Pathogenic:1

Aug 31, 2022

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The CTNNB1 c.283C>T variant is predicted to result in premature protein termination (p.Arg95*). This variant has been reported in patients with CTNNB1 related neurodevelopmental disorder (Kuechler et al. 2015. PubMed ID: 25326669; Posey et al. 2016. PubMed ID: 27959697). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. Nonsense variants in CTNNB1 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Inborn genetic diseases Pathogenic:1

Nov 06, 2017

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Medulloblastoma;C0206711:Pilomatrixoma;C0699790:Carcinoma of colon;C0919267:Ovarian neoplasm;C2239176:Hepatocellular carcinoma;C3554449:Severe intellectual disability-progressive spastic diplegia syndrome;C4539767:Exudative vitreoretinopathy 7 Pathogenic:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Severe intellectual disability-progressive spastic diplegia syndrome Pathogenic:1

Sep 01, 2017

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This nonsense mutation is categorized as deleterious according to ACMG guidelines (PMID:18414213). It was found twice in our laboratory de novo: in a 3-year-old male with torsion dystonia, expressive language disorder, hypotonia, hyperextension of knees, microcephaly; also in a 3-year-old female with microcephaly, global delays, mixed tone, spasticity, joint contractures. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	0.72
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.97	D
Vest4		0.98, 0.98, 0.98
GERP RS		4.5
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.8

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs775104326; hg19: chr3-41266486; COSMIC: COSV62693690; COSMIC: COSV62693690;