rs114511558

Positions:

chr2-237387630-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2BP4_StrongBP6BS1

The NM_004369.4(COL6A3):c.1264G>A(p.Val422Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00027 in 1,613,700 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00024 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00027 ( 0 hom. )

Consequence

COL6A3
NM_004369.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 3.21

Variant links:

Genes affected

COL6A3 (HGNC:2213): (collagen type VI alpha 3 chain) This gene encodes the alpha-3 chain, one of the three alpha chains of type VI collagen, a beaded filament collagen found in most connective tissues. The alpha-3 chain of type VI collagen is much larger than the alpha-1 and -2 chains. This difference in size is largely due to an increase in the number of subdomains, similar to von Willebrand Factor type A domains, that are found in the amino terminal globular domain of all the alpha chains. These domains have been shown to bind extracellular matrix proteins, an interaction that explains the importance of this collagen in organizing matrix components. Mutations in the type VI collagen genes are associated with Bethlem myopathy, a rare autosomal dominant proximal myopathy with early childhood onset. Mutations in this gene are also a cause of Ullrich congenital muscular dystrophy, also referred to as Ullrich scleroatonic muscular dystrophy, an autosomal recessive congenital myopathy that is more severe than Bethlem myopathy. Multiple transcript variants have been identified, but the full-length nature of only some of these variants has been described. [provided by RefSeq, Jun 2009]

COL6A3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.011315376).

BP6

Variant 2-237387630-C-T is Benign according to our data. Variant chr2-237387630-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 94904.We mark this variant Likely_benign, oryginal submissions are: {Benign=4, Uncertain_significance=1, Likely_benign=1}. Variant chr2-237387630-C-T is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000236 (36/152308) while in subpopulation EAS AF= 0.00676 (35/5178). AF 95% confidence interval is 0.005. There are 0 homozygotes in gnomad4. There are 17 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL6A3	NM_004369.4 linkuse as main transcript	c.1264G>A	p.Val422Met	missense_variant	4/44	ENST00000295550.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A3	ENST00000295550.9 linkuse as main transcript	c.1264G>A	p.Val422Met	missense_variant	4/44	1	NM_004369.4	P1	P12111-1

Frequencies

GnomAD3 genomes

AF:

0.000230

AC:

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00655

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000699

AC:

175

AN:

250330

Hom.:

AF XY:

0.000673

AC XY:

AN XY:

135264

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00888

Gnomad SAS exome

AF:

0.000164

Gnomad FIN exome

AF:

0.0000463

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.000273

AC:

399

AN:

1461392

Hom.:

Cov.:

AF XY:

0.000265

AC XY:

193

AN XY:

726936

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00887

Gnomad4 SAS exome

AF:

0.0000813

Gnomad4 FIN exome

AF:

0.0000749

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.000282

GnomAD4 genome

AF:

0.000236

AC:

AN:

152308

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00676

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000561

Hom.:

Bravo

AF:

0.000465

ExAC

AF:

0.000815

AC:

Asia WGS

AF:

0.00202

AC:

AN:

3478

EpiCase

AF:

0.000218

EpiControl

AF:

0.0000595

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Nov 05, 2012	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 26, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Dystonia 27

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Department of Neurology, Xijing Hospital, Fourth Military Medical University

Mar 01, 2022

- -

Bethlem myopathy 1A

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Dec 25, 2023

- -

Collagen 6-related myopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

COL6A3-related disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 12, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Benign

-0.085

BayesDel_noAF

Uncertain

0.11

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.21

.;T;.;.;T;T

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.92

D;D;.;D;D;D

MetaRNN

Benign

0.011

T;T;T;T;T;T

MetaSVM

Uncertain

-0.0047

MutationAssessor

Uncertain

2.3

.;M;.;.;.;.

MutationTaster

Benign

1.0

D;D;D;D;D;D;D;N

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-1.2

N;N;N;N;N;.

REVEL

Uncertain

0.56

Sift

Uncertain

0.022

D;T;D;D;D;.

Sift4G

Pathogenic

0.0010

D;D;D;D;D;D

Polyphen

0.94

P;D;P;.;.;.

Vest4

0.57

MVP

0.90

MPC

0.31

ClinPred

0.077

GERP RS

5.2

Varity_R

0.16

gMVP

0.45

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over