3-8733975-C-G

Variant names:

• chr3-8733975-C-G
• rs1008642
• NM_033337.3:c.99C>G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PS1 PM1 PM2 PP3_Strong PP5_Moderate

The NM_033337.3(CAV3):​c.99C>G​(p.Asn33Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. 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 (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in Lovd. Synonymous variant affecting the same amino acid position (i.e. N33N) has been classified as Benign.

• Frequency: Genomes: not found (cov: 30)
• Consequence: CAV3 NM_033337.3 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: -0.522

Genes affected

CAV3 (HGNC:1529): (caveolin 3) This gene encodes a caveolin family member, which functions as a component of the caveolae plasma membranes found in most cell types. Caveolin proteins are proposed to be scaffolding proteins for organizing and concentrating certain caveolin-interacting molecules. Mutations identified in this gene lead to interference with protein oligomerization or intra-cellular routing, disrupting caveolae formation and resulting in Limb-Girdle muscular dystrophy type-1C (LGMD-1C), hyperCKemia or rippling muscle disease (RMD). Alternative splicing has been identified for this locus, with inclusion or exclusion of a differentially spliced intron. In addition, transcripts utilize multiple polyA sites and contain two potential translation initiation sites. [provided by RefSeq, Jul 2008]

SSUH2 (HGNC:24809): (ssu-2 homolog) Involved in odontogenesis. Located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PS1: Transcript NM_033337.3 (CAV3) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd
• PM1: In a topological_domain Cytoplasmic (size 82) in uniprot entity CAV3_HUMAN there are 46 pathogenic changes around while only 9 benign (84%) in NM_033337.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99
• PP5: Variant 3-8733975-C-G is Pathogenic according to our data. Variant chr3-8733975-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 8289.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-8733975-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CAV3	NM_033337.3	c.99C>G	p.Asn33Lys	missense_variant	Exon 1 of 2	ENST00000343849.3	NP_203123.1
CAV3	NM_001234.5	c.99C>G	p.Asn33Lys	missense_variant	Exon 1 of 3		NP_001225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CAV3	ENST00000343849.3	c.99C>G	p.Asn33Lys	missense_variant	Exon 1 of 2	1	NM_033337.3	ENSP00000341940.2

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 30

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Distal myopathy, Tateyama type Pathogenic:1 Other:1

Apr 15, 2012

Leiden Muscular Dystrophy (CAV3)

Significance: not provided

Review Status: no classification provided

Collection Method: curation

- -

Jan 01, 2005

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Long QT syndrome Pathogenic:1

Jul 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (gnomAD no frequency). For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 8289). This missense change has been observed in individuals with clinical features of autosomal dominant CAV3-related conditions (PMID: 15564037, 15580566, 27061274; Invitae). It has also been observed to segregate with disease in related individuals. This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 33 of the CAV3 protein (p.Asn33Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.98	D;D
Eigen	Benign	-0.012
Eigen_PC	Benign	-0.15
FATHMM_MKL	Benign	0.58	D
LIST_S2	Uncertain	0.97	.;D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.78	D
MutationAssessor	Pathogenic	3.6	H;H
PrimateAI	Uncertain	0.69	T
PROVEAN	Pathogenic	-5.1	D;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0020	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.89
MutPred		0.96		Gain of solvent accessibility (P = 0.0086);Gain of solvent accessibility (P = 0.0086);
MVP		1.0
MPC		1.5
ClinPred		0.99	D
GERP RS		1.6
Varity_R		0.76
gMVP		0.98

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

LitVar

Other links and lift over

dbSNP: rs1008642; hg19: chr3-8775661;