rs61729839

Variant names:

• chr2-237368736-C-A
• rs61729839
• NM_004369.4:c.4727G>T

Your query was ambiguous. Multiple possible variants found:

• chr2-237368736-C-A
• chr2-237368736-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_004369.4(COL6A3):​c.4727G>T​(p.Arg1576Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1576W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: COL6A3 NM_004369.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.15
• Publications: 17 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: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.879

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A3	NM_004369.4	c.4727G>T	p.Arg1576Leu	missense_variant	Exon 10 of 44	ENST00000295550.9	NP_004360.2
COL6A3	NM_057167.4	c.4109G>T	p.Arg1370Leu	missense_variant	Exon 9 of 43		NP_476508.2
COL6A3	NM_057166.5	c.2906G>T	p.Arg969Leu	missense_variant	Exon 7 of 41		NP_476507.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A3	ENST00000295550.9	c.4727G>T	p.Arg1576Leu	missense_variant	Exon 10 of 44	1	NM_004369.4	ENSP00000295550.4
COL6A3	ENST00000472056.5	c.2906G>T	p.Arg969Leu	missense_variant	Exon 7 of 41	1		ENSP00000418285.1
COL6A3	ENST00000353578.9	c.4109G>T	p.Arg1370Leu	missense_variant	Exon 9 of 43	5		ENSP00000315873.4
COL6A3	ENST00000684597.1	c.116-60G>T		intron_variant	Intron 1 of 2			ENSP00000508021.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00 AC: 0 AN: 251486 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1461892 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 727248

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

American (AMR) AF: 0.00 AC: 0 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: 0.00 AC: 0 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.53	.;D;.;T;.
Eigen	Benign	-0.052
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.20	N
LIST_S2	Uncertain	0.95	D;D;D;D;.
M_CAP	Uncertain	0.22	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D
MetaSVM	Benign	-0.31	T
MutationAssessor	Uncertain	2.4	.;M;.;.;.
PhyloP100		1.1
PrimateAI	Benign	0.38	T
PROVEAN	Uncertain	-4.0	D;D;D;.;D
REVEL	Uncertain	0.52
Sift	Uncertain	0.018	D;D;D;.;D
Sift4G	Uncertain	0.010	D;D;D;D;D
Polyphen		1.0	D;D;.;.;D
Vest4		0.66
MutPred		0.71		.;Loss of disorder (P = 0.0695);.;.;.;
MVP		0.81
MPC		0.69
ClinPred		0.93	D
GERP RS		4.5
Varity_R		0.58
gMVP		0.79
Mutation Taster		=80/20	polymorphism

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

Other links and lift over

dbSNP: rs61729839; hg19: chr2-238277379;