rs121913395

Variant names:

• chr3-41224573-G-A
• rs121913395
• NM_001904.4:c.61G>A

Your query was ambiguous. Multiple possible variants found:

• chr3-41224573-G-A
• chr3-41224573-G-C
• chr3-41224573-G-T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001904.4(CTNNB1):​c.61G>A​(p.Ala21Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CTNNB1 NM_001904.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.00
• Publications: 23 publications found

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]

CTNNB1 Gene-Disease associations (from GenCC):

• exudative vitreoretinopathy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
• severe intellectual disability-progressive spastic diplegia syndrome

  Inheritance: AD, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, Labcorp Genetics (formerly Invitae), Illumina, G2P, Ambry Genetics
• exudative vitreoretinopathy 7

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.26455465).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001904.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTNNB1	NM_001904.4	MANE Select	c.61G>A	p.Ala21Thr	missense	Exon 3 of 15	NP_001895.1
	CTNNB1	NM_001098209.2		c.61G>A	p.Ala21Thr	missense	Exon 3 of 16	NP_001091679.1
	CTNNB1	NM_001098210.2		c.61G>A	p.Ala21Thr	missense	Exon 3 of 16	NP_001091680.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTNNB1	ENST00000349496.11	TSL:1 MANE Select	c.61G>A	p.Ala21Thr	missense	Exon 3 of 15	ENSP00000344456.5
	CTNNB1	ENST00000396183.7	TSL:1	c.61G>A	p.Ala21Thr	missense	Exon 3 of 16	ENSP00000379486.3
	CTNNB1	ENST00000396185.8	TSL:1	c.61G>A	p.Ala21Thr	missense	Exon 3 of 16	ENSP00000379488.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 16, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals affected with CTNNB1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 21 of the CTNNB1 protein (p.Ala21Thr). ClinVar contains an entry for this variant (Variation ID: 376224). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.063	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.31	T
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.26	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.34	N
PhyloP100		8.0
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	0.45	N
REVEL	Benign	0.15
Sift	Benign	0.098	T
Sift4G	Benign	0.14	T
Polyphen		0.036	B
Vest4		0.49
MutPred		0.25		Gain of phosphorylation at A21 (P = 0.0501)
MVP		0.61
MPC		1.1
ClinPred		0.65	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.15
gMVP		0.64
Mutation Taster		=45/55	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs121913395; hg19: chr3-41266064; COSMIC: COSV62699844;