3-8745705-C-A

Position:

• chr3-8745705-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 5P and 4B. PVS1_Strong PP5 BS2

The NM_033337.3(CAV3):​c.294C>A​(p.Cys98Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,854 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: CAV3 NM_033337.3 stop_gained
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 0.502

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]

OXTR (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 4 pathogenic variants in the truncated region.
• PP5: Variant 3-8745705-C-A is Pathogenic according to our data. Variant chr3-8745705-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 191444.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=2}.
• BS2: High AC in GnomAdExome4 at 7 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CAV3	NM_033337.3	c.294C>A	p.Cys98Ter	stop_gained	2/2	ENST00000343849.3	NP_203123.1
CAV3	NM_001234.5	c.294C>A	p.Cys98Ter	stop_gained	2/3		NP_001225.1
OXTR	XR_007095681.1	n.1885-3103G>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CAV3	ENST00000343849.3	c.294C>A	p.Cys98Ter	stop_gained	2/2	1	NM_033337.3	ENSP00000341940	P1
CAV3	ENST00000397368.2	c.294C>A	p.Cys98Ter	stop_gained	2/3	1		ENSP00000380525	P1
CAV3	ENST00000472766.1	n.155+11715C>A		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461854 Hom.: 0 Cov.: 32 AF XY: 0.00000825 AC XY: 6 AN XY: 727232

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000629

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	research	Biesecker Lab/Clinical Genomics Section, National Institutes of Health	Jun 24, 2013	- -
Uncertain significance, criteria provided, single submitter	clinical testing	AiLife Diagnostics, AiLife Diagnostics	Aug 24, 2021	- -

Long QT syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 31, 2019

This sequence change results in a premature translational stop signal in the CAV3 gene (p.Cys98*). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 54 amino acids of the CAV3 protein. This variant is not present in population databases (ExAC no frequency). This variant has been observed in individual(s) unselected for cardiac conditions undergoing exome sequencing (PMID: 23861362). ClinVar contains an entry for this variant (Variation ID: 191444). This variant disrupts the p.Pro105 amino acid residue in CAV3. Other variants that disrupt this residue have been determined to be pathogenic (PMID: 9537420,18509671, 19238754, 21182936, 28232187, 30153853). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	41
DANN	Uncertain	0.99
Eigen	Pathogenic	0.80
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.88	D
MutationTaster	Benign	1.0	A;D
Vest4		0.93
GERP RS		3.9

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: rs200202503; hg19: chr3-8787391;