dbSNP rs148183839: COL6A3:p.Met3175Thr (chr2-237324784-A-G) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_004369.4(COL6A3):c.9524T>C(p.Met3175Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00084 in 1,613,868 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 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. M3175L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0010 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00082 ( 2 hom. )

Consequence

COL6A3
NM_004369.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:7

Conservation

PhyloP100: 3.98

Publications

3 publications found

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 Gene-Disease associations (from GenCC):

Bethlem myopathy 1A
Inheritance: AR, AD, SD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics
collagen 6-related myopathy
Inheritance: AR, SD, AD Classification: DEFINITIVE Submitted by: ClinGen
Ullrich congenital muscular dystrophy 1C
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
dystonia 27
Inheritance: AR Classification: STRONG, SUPPORTIVE, LIMITED, NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, ClinGen, Ambry Genetics, Illumina
Ullrich congenital muscular dystrophy 1A
Inheritance: AR, AD, SD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
Bethlem myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Ullrich congenital muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

COL6A3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0070381165).

BP6

Variant 2-237324784-A-G is Benign according to our data. Variant chr2-237324784-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 282891.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00101 (154/152288) while in subpopulation NFE AF = 0.000691 (47/68040). AF 95% confidence interval is 0.000533. There are 0 homozygotes in GnomAd4. There are 100 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 2 AD,AR,SD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004369.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL6A3	NM_004369.4	MANE Select	c.9524T>C	p.Met3175Thr	missense	Exon 44 of 44	NP_004360.2	D9ZGF2
COL6A3	NM_057167.4		c.8906T>C	p.Met2969Thr	missense	Exon 43 of 43	NP_476508.2	P12111-2
COL6A3	NM_057166.5		c.7703T>C	p.Met2568Thr	missense	Exon 41 of 41	NP_476507.3	P12111-4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL6A3	ENST00000295550.9	TSL:1 MANE Select	c.9524T>C	p.Met3175Thr	missense	Exon 44 of 44	ENSP00000295550.4	P12111-1
COL6A3	ENST00000472056.5	TSL:1	c.7703T>C	p.Met2568Thr	missense	Exon 41 of 41	ENSP00000418285.1	P12111-4
COL6A3	ENST00000353578.9	TSL:5	c.8906T>C	p.Met2969Thr	missense	Exon 43 of 43	ENSP00000315873.4	P12111-2

Frequencies

GnomAD3 genomes

AF:

0.00101

AC:

154

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00970

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000691

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00114

AC:

285

AN:

248940

AF XY:

0.00110

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00992

Gnomad NFE exome

AF:

0.000529

Gnomad OTH exome

AF:

0.00131

GnomAD4 exome

AF:

0.000822

AC:

1202

AN:

1461580

Hom.:

Cov.:

AF XY:

0.000811

AC XY:

590

AN XY:

727078

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33478

American (AMR)

AF:

0.000134

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00929

AC:

494

AN:

53154

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000603

AC:

670

AN:

1111978

Other (OTH)

AF:

0.000497

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

Heterozygous variant carriers

120

181

241

301

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

104

130

<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:

0.00101

AC:

154

AN:

152288

Hom.:

Cov.:

AF XY:

0.00134

AC XY:

100

AN XY:

74464

show subpopulations

African (AFR)

AF:

0.0000722

AC:

AN:

41544

American (AMR)

AF:

0.0000654

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00970

AC:

103

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000691

AC:

AN:

68040

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

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:

0.000488

Hom.:

Bravo

AF:

0.000302

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.00130

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.000840

AC:

102

EpiCase

AF:

0.000600

EpiControl

AF:

0.000296

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

not specified (2)

Bethlem myopathy 1A (1)

COL6A3-related disorder (1)

Collagen 6-related myopathy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.40

BayesDel_noAF

Benign

-0.38

CADD

Benign

(source)

DANN

Benign

0.65

DEOGEN2

Benign

0.17

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.47

FATHMM_MKL

Benign

0.73

LIST_S2

Benign

0.58

M_CAP

Benign

0.055

MetaRNN

Benign

0.0070

MetaSVM

Benign

-0.37

MutationAssessor

Benign

1.2

PhyloP100

4.0

PrimateAI

Benign

0.34

PROVEAN

Benign

-0.90

REVEL

Benign

0.17

Sift

Uncertain

0.013

Sift4G

Uncertain

0.0020

Polyphen

0.0

Vest4

0.083

MVP

0.78

MPC

0.17

ClinPred

0.015

GERP RS

4.0

Varity_R

0.26

gMVP

0.32

Mutation Taster

=99/1

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over