rs148038440

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The NM_004369.4(COL6A3):c.3902G>A(p.Arg1301Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000209 in 1,614,056 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R1301W) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00062 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

COL6A3
NM_004369.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4O:1

Conservation

PhyloP100: 0.412

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 Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.037022382).

BP6

Variant 2-237372115-C-T is Benign according to our data. Variant chr2-237372115-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 282774.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, not_provided=1, Uncertain_significance=1, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL6A3	NM_004369.4 linkuse as main transcript	c.3902G>A	p.Arg1301Gln	missense_variant	9/44	ENST00000295550.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A3	ENST00000295550.9 linkuse as main transcript	c.3902G>A	p.Arg1301Gln	missense_variant	9/44	1	NM_004369.4	P1	P12111-1

Frequencies

GnomAD3 genomes

AF:

0.000618

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00164

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00143

GnomAD3 exomes

AF:

0.000263

AC:

AN:

250962

Hom.:

AF XY:

0.000250

AC XY:

AN XY:

135778

show subpopulations

Gnomad AFR exome

AF:

0.00142

Gnomad AMR exome

AF:

0.000492

Gnomad ASJ exome

AF:

0.0000994

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000185

Gnomad OTH exome

AF:

0.000490

GnomAD4 exome

AF:

0.000166

AC:

243

AN:

1461766

Hom.:

Cov.:

AF XY:

0.000155

AC XY:

113

AN XY:

727192

show subpopulations

Gnomad4 AFR exome

AF:

0.00170

Gnomad4 AMR exome

AF:

0.000514

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000464

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000998

Gnomad4 OTH exome

AF:

0.000695

GnomAD4 genome

AF:

0.000617

AC:

AN:

152290

Hom.:

Cov.:

AF XY:

0.000631

AC XY:

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.00164

Gnomad4 AMR

AF:

0.000523

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000206

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.000293

Hom.:

Bravo

AF:

0.000714

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000264

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:4Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 11, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 04, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Nov 18, 2019	In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Reported as heterozygous variant in individual with reported clinically-suspected limb-girdle muscular dystrophy; however, a second variant in COL6A3 was not identified and additional clinical information was not provided (Nallamilli et al., 2018); This variant is associated with the following publications: (PMID: 30564623) -

Bethlem myopathy 1A

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Dec 02, 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. -

Dystonia 27;CN029274:Bethlem myopathy 1A

Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

Variant interpreted as Uncertain significance and reported on 10-03-2020 by Lab or GTR ID 500031. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.47

Cadd

Benign

Dann

Uncertain

0.99

Eigen

Benign

-0.53

Eigen_PC

Benign

-0.59

FATHMM_MKL

Benign

0.17

LIST_S2

Uncertain

0.91

D;D;D;D;.;D;D

M_CAP

Benign

0.040

MetaRNN

Benign

0.037

T;T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N

PrimateAI

Benign

0.24

PROVEAN

Benign

-2.0

N;N;N;.;N;N;N

REVEL

Benign

0.035

Sift

Benign

0.12

T;T;T;.;T;T;T

Sift4G

Benign

0.11

T;T;T;T;T;D;D

Polyphen

0.97

D;B;.;.;D;.;.

Vest4

0.21

MVP

0.55

MPC

0.33

ClinPred

0.018

GERP RS

2.9

Varity_R

0.13

gMVP

0.53

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