Genetic Variant NM_001849.4:c.2160C>G (chr21-46125975-C-G) – ACMG Classification: Benign (-21 pts)

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_001849.4(COL6A2):c.2160C>G(p.Arg720Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00332 in 1,613,124 control chromosomes in the GnomAD database, including 162 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.017 ( 65 hom., cov: 33)

Exomes 𝑓: 0.0019 ( 97 hom. )

Consequence

COL6A2
NM_001849.4 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:12

Conservation

PhyloP100: -0.111

Publications

2 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, SD, 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: AR, AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
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 -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.55).

BP6

Variant 21-46125975-C-G is Benign according to our data. Variant chr21-46125975-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 93934.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-0.111 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0575 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001849.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL6A2	NM_001849.4	MANE Select	c.2160C>G	p.Arg720Arg	synonymous	Exon 26 of 28	NP_001840.3
COL6A2	NM_058174.3	MANE Plus Clinical	c.2160C>G	p.Arg720Arg	synonymous	Exon 26 of 28	NP_478054.2	P12110-2
COL6A2	NM_058175.3		c.2160C>G	p.Arg720Arg	synonymous	Exon 26 of 28	NP_478055.2	P12110-3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL6A2	ENST00000300527.9	TSL:1 MANE Select	c.2160C>G	p.Arg720Arg	synonymous	Exon 26 of 28	ENSP00000300527.4	P12110-1
COL6A2	ENST00000397763.6	TSL:5 MANE Plus Clinical	c.2160C>G	p.Arg720Arg	synonymous	Exon 26 of 28	ENSP00000380870.1	P12110-2
COL6A2	ENST00000857098.1		c.2355C>G	p.Arg785Arg	synonymous	Exon 26 of 28	ENSP00000527157.1

Frequencies

GnomAD3 genomes

AF:

0.0174

AC:

2648

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0595

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00903

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000220

Gnomad OTH

AF:

0.0148

GnomAD2 exomes

AF:

0.00432

AC:

1084

AN:

251076

AF XY:

0.00313

show subpopulations

Gnomad AFR exome

AF:

0.0597

Gnomad AMR exome

AF:

0.00272

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000115

Gnomad OTH exome

AF:

0.00131

GnomAD4 exome

AF:

0.00185

AC:

2704

AN:

1460866

Hom.:

Cov.:

AF XY:

0.00163

AC XY:

1185

AN XY:

726726

show subpopulations

African (AFR)

AF:

0.0672

AC:

2251

AN:

33480

American (AMR)

AF:

0.00318

AC:

142

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.0000812

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52526

Middle Eastern (MID)

AF:

0.00225

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000594

AC:

AN:

1111912

Other (OTH)

AF:

0.00373

AC:

225

AN:

60378

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

175

350

524

699

874

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

140

210

280

350

<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:

0.0174

AC:

2654

AN:

152258

Hom.:

Cov.:

AF XY:

0.0167

AC XY:

1246

AN XY:

74438

show subpopulations

African (AFR)

AF:

0.0595

AC:

2469

AN:

41528

American (AMR)

AF:

0.00902

AC:

138

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.000207

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.000221

AC:

AN:

68020

Other (OTH)

AF:

0.0147

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

123

246

368

491

614

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.00519

Hom.:

Bravo

AF:

0.0200

Asia WGS

AF:

0.00202

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

not provided (3)

Bethlem myopathy 1A (1)

Collagen 6-related myopathy (1)

Myosclerosis (1)

Ullrich congenital muscular dystrophy 1A;C1850671:Myosclerosis;CN029274:Bethlem myopathy 1A (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.55

CADD

Benign

7.5

(source)

DANN

Benign

0.61

PhyloP100

-0.11

Mutation Taster

=99/1

polymorphism (auto)

(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