rs146546544

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_004369.4(COL6A3):c.5968C>T(p.Arg1990Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000547 in 1,614,044 control chromosomes in the GnomAD database, including 9 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1990Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00035 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00057 ( 9 hom. )

Consequence

COL6A3
NM_004369.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:6

Conservation

PhyloP100: 2.21

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 -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010281533).

BP6

Variant 2-237363348-G-A is Benign according to our data. Variant chr2-237363348-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 285696.We mark this variant Likely_benign, oryginal submissions are: {Benign=3, Uncertain_significance=1, Likely_benign=3}.

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000348 (53/152186) while in subpopulation SAS AF= 0.0079 (38/4808). AF 95% confidence interval is 0.00592. There are 0 homozygotes in gnomad4. There are 34 alleles in male gnomad4 subpopulation. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
COL6A3	NM_004369.4 linkuse as main transcript	c.5968C>T	p.Arg1990Trp	missense_variant	14/44	ENST00000295550.9
COL6A3	NM_057167.4 linkuse as main transcript	c.5350C>T	p.Arg1784Trp	missense_variant	13/43
COL6A3	NM_057166.5 linkuse as main transcript	c.4147C>T	p.Arg1383Trp	missense_variant	11/41

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A3	ENST00000295550.9 linkuse as main transcript	c.5968C>T	p.Arg1990Trp	missense_variant	14/44	1	NM_004369.4	P1	P12111-1
COL6A3	ENST00000472056.5 linkuse as main transcript	c.4147C>T	p.Arg1383Trp	missense_variant	11/41	1			P12111-4
COL6A3	ENST00000353578.9 linkuse as main transcript	c.5350C>T	p.Arg1784Trp	missense_variant	13/43	5			P12111-2

Frequencies

GnomAD3 genomes

AF:

0.000349

AC:

AN:

152068

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00790

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00105

AC:

263

AN:

251458

Hom.:

AF XY:

0.00150

AC XY:

204

AN XY:

135920

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00797

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.000978

GnomAD4 exome

AF:

0.000568

AC:

830

AN:

1461858

Hom.:

Cov.:

AF XY:

0.000832

AC XY:

605

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00803

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000782

Gnomad4 OTH exome

AF:

0.000464

GnomAD4 genome

AF:

0.000348

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.000457

AC XY:

AN XY:

74384

show subpopulations

Gnomad4 AFR

AF:

0.0000963

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00790

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000149

Hom.:

Bravo

AF:

0.000144

ExAC

AF:

0.00119

AC:

145

Asia WGS

AF:

0.00231

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 29, 2016	- -
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. -

Congenital contracture

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center of Genomic medicine, Geneva, University Hospital of Geneva

Apr 10, 2015

This homozygous variant in the COL6A3 gene was found in a fÅ“tus with arthrogryposis. The mother and the father are consanguinous and are both heterozygous for this variant. -

Bethlem myopathy 1A

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Nov 03, 2023

- -

Collagen 6-related myopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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

Jul 05, 2022

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). -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jul 01, 2023

COL6A3: BP4, BS1 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.41

Cadd

Benign

Dann

Benign

0.97

Eigen

Benign

-0.021

Eigen_PC

Benign

-0.082

FATHMM_MKL

Benign

0.17

LIST_S2

Uncertain

0.94

D;D;D;D;.

MetaRNN

Benign

0.010

T;T;T;T;T

MetaSVM

Benign

-1.0

MutationTaster

Benign

1.0

N;N;N;N;N;N

PrimateAI

Benign

0.26

PROVEAN

Uncertain

-3.1

D;D;D;.;D

REVEL

Benign

0.11

Sift

Uncertain

0.0040

D;D;D;.;D

Sift4G

Pathogenic

0.0010

D;D;D;D;D

Polyphen

1.0

D;D;.;.;D

Vest4

0.49

MutPred

0.58

.;Loss of solvent accessibility (P = 0.001);.;.;.;

MVP

0.65

MPC

0.59

ClinPred

0.091

GERP RS

3.9

Varity_R

0.11

gMVP

0.65

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