Genetic Variant COL6A3:p.Val12Ile (chr2-237396784-C-T) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_004369.4(COL6A3):c.34G>A(p.Val12Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000596 in 1,614,154 control chromosomes in the GnomAD database, including 12 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V12F) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00041 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00062 ( 11 hom. )

Consequence

COL6A3
NM_004369.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: -0.195

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 -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0032163858).

BP6

Variant 2-237396784-C-T is Benign according to our data. Variant chr2-237396784-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 166948.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000407 (62/152298) while in subpopulation SAS AF = 0.0104 (50/4816). AF 95% confidence interval is 0.00809. There are 1 homozygotes in GnomAd4. There are 42 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 11 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.34G>A	p.Val12Ile	missense	Exon 2 of 44	NP_004360.2	D9ZGF2
COL6A3	NM_057167.4		c.34G>A	p.Val12Ile	missense	Exon 2 of 43	NP_476508.2	P12111-2
COL6A3	NM_057166.5		c.34G>A	p.Val12Ile	missense	Exon 2 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.34G>A	p.Val12Ile	missense	Exon 2 of 44	ENSP00000295550.4	P12111-1
COL6A3	ENST00000472056.5	TSL:1	c.34G>A	p.Val12Ile	missense	Exon 2 of 41	ENSP00000418285.1	P12111-4
COL6A3	ENST00000392004.7	TSL:1	c.34G>A	p.Val12Ile	missense	Exon 2 of 8	ENSP00000375861.3	P12111-5

Frequencies

GnomAD3 genomes

AF:

0.000407

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.0104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00147

AC:

370

AN:

251420

AF XY:

0.00186

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.000549

Gnomad ASJ exome

AF:

0.000397

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000791

Gnomad OTH exome

AF:

0.000978

GnomAD4 exome

AF:

0.000616

AC:

900

AN:

1461856

Hom.:

Cov.:

AF XY:

0.000873

AC XY:

635

AN XY:

727230

show subpopulations

African (AFR)

AF:

0.000239

AC:

AN:

33480

American (AMR)

AF:

0.000537

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.000191

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00914

AC:

788

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000153

AC:

AN:

1111994

Other (OTH)

AF:

0.000911

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

Heterozygous variant carriers

114

172

229

286

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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:

0.000407

AC:

AN:

152298

Hom.:

Cov.:

AF XY:

0.000564

AC XY:

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

41558

American (AMR)

AF:

0.000392

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.0104

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.513

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:

0.0000493

Hom.:

Bravo

AF:

0.000166

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00159

AC:

193

Asia WGS

AF:

0.00375

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

Bethlem myopathy 1A (1)

Collagen 6-related myopathy (1)

Inborn genetic diseases (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.48

CADD

Benign

0.087

(source)

DANN

Benign

0.84

DEOGEN2

Benign

0.15

Eigen

Benign

-1.7

Eigen_PC

Benign

-1.6

FATHMM_MKL

Benign

0.012

LIST_S2

Benign

0.34

MetaRNN

Benign

0.0032

MetaSVM

Benign

-0.75

MutationAssessor

Benign

-0.74

PhyloP100

-0.20

PrimateAI

Benign

0.24

PROVEAN

Benign

-0.18

REVEL

Benign

0.15

Sift

Benign

0.36

Sift4G

Pathogenic

0.0

Polyphen

0.11

Vest4

0.089

MVP

0.51

MPC

0.12

ClinPred

0.0018

GERP RS

-4.7

Varity_R

0.023

gMVP

0.082

Mutation Taster

=96/4

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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