NM_001849.4:c.2170C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_001849.4(COL6A2):c.2170C>T(p.Arg724Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000987 in 1,613,102 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts 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. R724L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00080 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0010 ( 3 hom. )

Consequence

COL6A2
NM_001849.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:8

Conservation

PhyloP100: 2.58

Publications

5 publications found

Variant links:

Genes affected

COL6A2 (HGNC:2212): (collagen type VI alpha 2 chain) This gene encodes one of the three alpha chains of type VI collagen, a beaded filament collagen found in most connective tissues. The product of this gene contains several domains similar to von Willebrand Factor type A domains. 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 this gene are associated with Bethlem myopathy and Ullrich scleroatonic muscular dystrophy. Three transcript variants have been identified for this gene. [provided by RefSeq, Jul 2008]

COL6A2 Gene-Disease associations (from GenCC):

collagen 6-related myopathy
Inheritance: AD, AR Classification: DEFINITIVE Submitted by: ClinGen
Ullrich congenital muscular dystrophy 1B
Inheritance: AR, AD Classification: DEFINITIVE Submitted by: G2P
Bethlem myopathy 1A
Inheritance: AD, AR Classification: STRONG Submitted by: Genomics England PanelApp
Ullrich congenital muscular dystrophy 1A
Inheritance: AD, AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
Bethlem myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Ullrich congenital muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
myosclerosis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

COL6A2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.030429065).

BP6

Variant 21-46125985-C-T is Benign according to our data. Variant chr21-46125985-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 286822.

BS2

High Homozygotes in GnomAdExome4 at 3 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A2	NM_001849.4 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 26 of 28	ENST00000300527.9	NP_001840.3	P12110-1A0A384MDP3
COL6A2	NM_058174.3 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 26 of 28		NP_478054.2	P12110-2
COL6A2	NM_058175.3 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 26 of 28		NP_478055.2	P12110-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL6A2	ENST00000300527.9 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 26 of 28	1	NM_001849.4	ENSP00000300527.4	P12110-1
COL6A2	ENST00000397763.6 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 26 of 28	5		ENSP00000380870.1	P12110-2
COL6A2	ENST00000409416.6 link	c.2170C>T	p.Arg724Cys	missense_variant	Exon 25 of 27	5		ENSP00000387115.1	P12110-3
COL6A2	ENST00000413758.1 link	c.*91C>T		downstream_gene_variant		3		ENSP00000395751.1	H7C0M5

Frequencies

GnomAD3 genomes

AF:

0.000802

AC:

122

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00440

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00273

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00115

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.00107

AC:

269

AN:

251090

AF XY:

0.00112

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00420

Gnomad NFE exome

AF:

0.00137

Gnomad OTH exome

AF:

0.00114

GnomAD4 exome

AF:

0.00101

AC:

1470

AN:

1460810

Hom.:

Cov.:

AF XY:

0.000992

AC XY:

721

AN XY:

726690

show subpopulations

African (AFR)

AF:

0.000119

AC:

AN:

33476

American (AMR)

AF:

0.000201

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39696

South Asian (SAS)

AF:

0.000255

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00396

AC:

208

AN:

52528

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00106

AC:

1175

AN:

1111856

Other (OTH)

AF:

0.000845

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

195

292

390

487

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

126

168

210

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000801

AC:

122

AN:

152292

Hom.:

Cov.:

AF XY:

0.000806

AC XY:

AN XY:

74478

show subpopulations

African (AFR)

AF:

0.000144

AC:

AN:

41558

American (AMR)

AF:

0.000131

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5172

South Asian (SAS)

AF:

0.000414

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00273

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00115

AC:

AN:

68020

Other (OTH)

AF:

0.000473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000920

Hom.:

Bravo

AF:

0.000608

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.00103

AC:

125

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.000872

EpiControl

AF:

0.000771

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:3

Jul 24, 2019

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Observed in an individual with cerebral palsy in published literature, however no additional clinical details were available (Pingel et al., 2019); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 30564623, 30467950) -

Apr 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

COL6A2: BS1 -

Feb 21, 2018

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 12, 2023

Revvity Omics, Revvity

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Collagen 6-related myopathy

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

Jul 30, 2021

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:research

- -

Bethlem myopathy

Uncertain:1

Oct 19, 2020

Neuromuscular Department, Shariati Hospital, Tehran University of Medical Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

28-year-old female, born as a floppy baby with some improvement. At the moment, she has proximal and distal weakness, and myogenic electromyography. -

Myosclerosis

Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Bethlem myopathy 1A

Benign:1

Jan 13, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

COL6A2-related disorder

Benign:1

Oct 04, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely 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

Uncertain

0.41

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Uncertain

-0.080

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.70

D;.;.;.

Eigen

Benign

0.15

Eigen_PC

Benign

0.077

FATHMM_MKL

Uncertain

0.82

LIST_S2

Pathogenic

0.97

D;D;.;D

M_CAP

Pathogenic

0.57

MetaRNN

Benign

0.030

T;T;T;T

MetaSVM

Uncertain

0.31

MutationAssessor

Pathogenic

2.9

M;M;M;M

PhyloP100

2.6

PrimateAI

Benign

0.47

PROVEAN

Uncertain

-2.9

D;D;D;D

REVEL

Uncertain

0.47

Sift

Uncertain

0.0010

D;D;D;D

Sift4G

Uncertain

0.0040

D;D;D;D

Polyphen

1.0

D;D;D;D

Vest4

0.59

MVP

0.95

MPC

0.61

ClinPred

0.075

GERP RS

1.9

Varity_R

0.56

gMVP

0.83

Mutation Taster

=100/0

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over