chr2-237368614-C-T

Variant names:

• chr2-237368614-C-T
• rs200433282
• NM_004369.4:c.4849G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_004369.4(COL6A3):​c.4849G>A​(p.Ala1617Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000113 in 1,613,326 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A1617S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000099 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: COL6A3 NM_004369.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:2
• Conservation: PhyloP100: 0.408
• Publications: 4 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 -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.049254805).
• BP6: Variant 2-237368614-C-T is Benign according to our data. Variant chr2-237368614-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 259301.

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.4849G>A	p.Ala1617Thr	missense	Exon 10 of 44	NP_004360.2	D9ZGF2
	COL6A3	NM_057167.4		c.4231G>A	p.Ala1411Thr	missense	Exon 9 of 43	NP_476508.2	P12111-2
	COL6A3	NM_057166.5		c.3028G>A	p.Ala1010Thr	missense	Exon 7 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.4849G>A	p.Ala1617Thr	missense	Exon 10 of 44	ENSP00000295550.4	P12111-1
	COL6A3	ENST00000472056.5	TSL:1	c.3028G>A	p.Ala1010Thr	missense	Exon 7 of 41	ENSP00000418285.1	P12111-4
	COL6A3	ENST00000353578.9	TSL:5	c.4231G>A	p.Ala1411Thr	missense	Exon 9 of 43	ENSP00000315873.4	P12111-2

Frequencies

GnomAD3 genomes AF: 0.0000987 AC: 15 AN: 151990 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000967

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000522 AC: 13 AN: 249002 AF XY: 0.0000370

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000107

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000115 AC: 168 AN: 1461218 Hom.: 0 Cov.: 33 AF XY: 0.000106 AC XY: 77 AN XY: 726908

African (AFR) AF: 0.0000299 AC: 1 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44720

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

East Asian (EAS) AF: 0.0000504 AC: 2 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52982

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.000136 AC: 151 AN: 1111910

Other (OTH) AF: 0.000232 AC: 14 AN: 60276

GnomAD4 genome AF: 0.0000986 AC: 15 AN: 152108 Hom.: 0 Cov.: 32 AF XY: 0.0000941 AC XY: 7 AN XY: 74356

African (AFR) AF: 0.0000964 AC: 4 AN: 41484

American (AMR) AF: 0.00 AC: 0 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5170

South Asian (SAS) AF: 0.00 AC: 0 AN: 4810

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10586

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 67972

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.0000475 Hom.: 0

Bravo AF: 0.0000718

ExAC AF: 0.0000330 AC: 4

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	2	-	not provided (2)
-	-	1	Bethlem myopathy 1A (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	11
DANN	Benign	0.60
DEOGEN2	Benign	0.14	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.075	N
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.049	T
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	-1.5	N
PhyloP100		0.41
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.11
Sift	Benign	0.65	T
Sift4G	Benign	0.27	T
Polyphen		0.26	B
Vest4		0.068
MVP		0.60
MPC		0.21
ClinPred		0.043	T
GERP RS		1.6
Varity_R		0.023
gMVP		0.31
Mutation Taster		=92/8	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: rs200433282; hg19: chr2-238277257; COSMIC: COSV55078366; COSMIC: COSV55078366;