rs376087730

Variant names:

• chr2-237388135-G-A
• rs376087730
• NM_004369.4:c.759C>T

Your query was ambiguous. Multiple possible variants found:

• chr2-237388135-G-A
• chr2-237388135-G-C

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.759C>T​(p.Thr253Thr) variant causes a synonymous change. The variant allele was found at a frequency of 0.000167 in 1,613,982 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. T253T) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00018 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00017 (0 hom.)
• Consequence: COL6A3 NM_004369.4 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: 3.85
• 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: AD, AR, SD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics
• collagen 6-related myopathy

  Inheritance: AD, AR 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: Illumina, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics, Orphanet
• Ullrich congenital muscular dystrophy 1A

  Inheritance: AR, AD, SD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• 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 (BayesDel_noAF=-0.39).
• BP6: Variant 2-237388135-G-A is Benign according to our data. Variant chr2-237388135-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 282674.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A3	NM_004369.4	MANE Select	c.759C>T	p.Thr253Thr	synonymous	Exon 4 of 44	NP_004360.2
	COL6A3	NM_057167.4		c.141C>T	p.Thr47Thr	synonymous	Exon 3 of 43	NP_476508.2
	COL6A3	NM_057165.5		c.141C>T	p.Thr47Thr	synonymous	Exon 3 of 8	NP_476506.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A3	ENST00000295550.9	TSL:1 MANE Select	c.759C>T	p.Thr253Thr	synonymous	Exon 4 of 44	ENSP00000295550.4
	COL6A3	ENST00000392004.7	TSL:1	c.141C>T	p.Thr47Thr	synonymous	Exon 3 of 8	ENSP00000375861.3
	COL6A3	ENST00000433762.1	TSL:1	c.759C>T	p.Thr253Thr	synonymous	Exon 4 of 6	ENSP00000389539.1

Frequencies

GnomAD3 genomes AF: 0.000177 AC: 27 AN: 152180 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000523

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: 0.000206

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000101 AC: 25 AN: 248590 AF XY: 0.0000891

Gnomad AFR exome AF: 0.000124

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000162

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.000166 AC: 243 AN: 1461802 Hom.: 0 Cov.: 32 AF XY: 0.000139 AC XY: 101 AN XY: 727198

African (AFR) AF: 0.0000896 AC: 3 AN: 33478

American (AMR) AF: 0.0000894 AC: 4 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26136

East Asian (EAS) AF: 0.0000756 AC: 3 AN: 39700

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53362

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

European-Non Finnish (NFE) AF: 0.000200 AC: 222 AN: 1111990

Other (OTH) AF: 0.000132 AC: 8 AN: 60392

GnomAD4 genome AF: 0.000177 AC: 27 AN: 152180 Hom.: 0 Cov.: 33 AF XY: 0.000175 AC XY: 13 AN XY: 74338

African (AFR) AF: 0.000121 AC: 5 AN: 41440

American (AMR) AF: 0.000523 AC: 8 AN: 15286

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10596

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

European-Non Finnish (NFE) AF: 0.000206 AC: 14 AN: 68032

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

Alfa AF: 0.000135 Hom.: 0

Bravo AF: 0.000249

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	1	Bethlem myopathy 1A (1)
-	-	1	Collagen 6-related myopathy (1)
-	1	-	not provided (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.39
CADD	Benign	15
DANN	Benign	0.58
PhyloP100		3.9
Mutation Taster		=93/7	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: rs376087730; hg19: chr2-238296778; COSMIC: COSV55110314; COSMIC: COSV55110314;