NM_031418.4:c.1437G>A

Variant names:

• chr11-26559769-G-A
• NM_031418.4:c.1437G>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_031418.4(ANO3):​c.1437G>A​(p.Met479Ile) variant causes a missense 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ANO3 NM_031418.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.13

Genes affected

ANO3 (HGNC:14004): (anoctamin 3) The protein encoded by this gene belongs to the TMEM16 family of predicted membrane proteins, that are also known as anoctamins. While little is known about the function of this gene, mutations in this gene have been associated with some cases of autosomal dominant craniocervical dystonia. Cells from individuals with a mutation in this gene exhibited abnormalities in endoplasmic reticulum-dependent calcium signaling. Studies in rat show that the rat ortholog of this protein interacts with, and modulates the activity of a sodium-activated potassium channel. Deletion of this gene caused increased pain sensitivity in the rat model system. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

MUC15 (HGNC:14956): (mucin 15, cell surface associated) Predicted to be located in Golgi lumen and plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.852

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ANO3	NM_031418.4	c.1437G>A	p.Met479Ile	missense_variant	Exon 14 of 27	ENST00000256737.8	NP_113606.2
MUC15	NM_001135091.2	c.*1296C>T		3_prime_UTR_variant	Exon 5 of 5	ENST00000529533.6	NP_001128563.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ANO3	ENST00000256737.8	c.1437G>A	p.Met479Ile	missense_variant	Exon 14 of 27	1	NM_031418.4	ENSP00000256737.3
MUC15	ENST00000529533	c.*1296C>T		3_prime_UTR_variant	Exon 5 of 5	1	NM_001135091.2	ENSP00000431983.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dystonic disorder Uncertain:1

Sep 15, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. This sequence change replaces methionine with isoleucine at codon 479 of the ANO3 protein (p.Met479Ile). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and isoleucine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with ANO3-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T;D;.
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Benign	0.051	D
MetaRNN	Pathogenic	0.85	D;D;D
MetaSVM	Benign	-0.40	T
MutationAssessor	Uncertain	2.4	.;M;.
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-3.6	D;D;D
REVEL	Uncertain	0.57
Sift	Pathogenic	0.0	D;D;D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		0.97	.;D;.
Vest4		0.83
MutPred		0.68		.;Gain of MoRF binding (P = 0.1805);.;
MVP		0.76
MPC		1.7
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.86
gMVP		0.97

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr11-26581316; COSMIC: COSV99846489; COSMIC: COSV99846489;