NM_004369.4:c.5341A>G

Variant names:

• chr2-237366846-T-C
• rs145447965
• NM_004369.4:c.5341A>G

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_Moderate BP6

The NM_004369.4(COL6A3):​c.5341A>G​(p.Ile1781Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000167 in 1,614,128 control chromosomes in the GnomAD database, with no homozygous occurrence. 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). Synonymous variant affecting the same amino acid position (i.e. I1781I) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000072 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00018 (0 hom.)
• Consequence: COL6A3 NM_004369.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: 1.99
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.09964514).
• BP6: Variant 2-237366846-T-C is Benign according to our data. Variant chr2-237366846-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 193877.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A3	NM_004369.4	MANE Select	c.5341A>G	p.Ile1781Val	missense	Exon 11 of 44	NP_004360.2	D9ZGF2
	COL6A3	NM_057167.4		c.4723A>G	p.Ile1575Val	missense	Exon 10 of 43	NP_476508.2	P12111-2
	COL6A3	NM_057166.5		c.3520A>G	p.Ile1174Val	missense	Exon 8 of 41	NP_476507.3	P12111-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A3	ENST00000295550.9	TSL:1 MANE Select	c.5341A>G	p.Ile1781Val	missense	Exon 11 of 44	ENSP00000295550.4	P12111-1
	COL6A3	ENST00000472056.5	TSL:1	c.3520A>G	p.Ile1174Val	missense	Exon 8 of 41	ENSP00000418285.1	P12111-4
	COL6A3	ENST00000353578.9	TSL:5	c.4723A>G	p.Ile1575Val	missense	Exon 10 of 43	ENSP00000315873.4	P12111-2

Frequencies

GnomAD3 genomes AF: 0.0000723 AC: 11 AN: 152236 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000954 AC: 24 AN: 251490 AF XY: 0.0000956

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000347

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000791

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.000176 AC: 258 AN: 1461892 Hom.: 0 Cov.: 32 AF XY: 0.000171 AC XY: 124 AN XY: 727246

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.000380 AC: 17 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000212 AC: 236 AN: 1112010

Other (OTH) AF: 0.0000828 AC: 5 AN: 60396

GnomAD4 genome AF: 0.0000723 AC: 11 AN: 152236 Hom.: 0 Cov.: 33 AF XY: 0.0000672 AC XY: 5 AN XY: 74370

African (AFR) AF: 0.0000241 AC: 1 AN: 41460

American (AMR) AF: 0.000262 AC: 4 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000882 AC: 6 AN: 68044

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.0000783 Hom.: 0

Bravo AF: 0.0000718

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000123 AC: 15

EpiCase AF: 0.000164

EpiControl AF: 0.000356

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	1	Bethlem myopathy 1A (1)
-	1	-	COL6A3-related disorder (1)
-	1	-	not provided (1)
-	1	-	Ullrich congenital muscular dystrophy 1A;C4225336:Dystonia 27;CN029274:Bethlem myopathy 1A (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.15	T
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-0.81	T
MutationAssessor	Benign	0.88	L
PhyloP100		2.0
PrimateAI	Benign	0.38	T
PROVEAN	Benign	0.020	N
REVEL	Benign	0.15
Sift	Benign	0.29	T
Sift4G	Benign	0.13	T
Polyphen		0.65	P
Vest4		0.27
MVP		0.75
MPC		0.27
ClinPred		0.078	T
GERP RS		3.1
Varity_R		0.13
gMVP		0.48
Mutation Taster		=66/34	polymorphism

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

Other links and lift over

dbSNP: rs145447965; hg19: chr2-238275489;