chr2-237365766-C-T

Position:

• chr2-237365766-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_004369.4(COL6A3):​c.5770G>A​(p.Val1924Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000124 in 1,614,080 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: COL6A3 NM_004369.4 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.0640

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11914322).
• BP6: Variant 2-237365766-C-T is Benign according to our data. Variant chr2-237365766-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 476539.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL6A3	NM_004369.4	c.5770G>A	p.Val1924Ile	missense_variant	12/44	ENST00000295550.9	NP_004360.2
COL6A3	NM_057167.4	c.5152G>A	p.Val1718Ile	missense_variant	11/43		NP_476508.2
COL6A3	NM_057166.5	c.3949G>A	p.Val1317Ile	missense_variant	9/41		NP_476507.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL6A3	ENST00000295550.9	c.5770G>A	p.Val1924Ile	missense_variant	12/44	1	NM_004369.4	ENSP00000295550.4
COL6A3	ENST00000472056.5	c.3949G>A	p.Val1317Ile	missense_variant	9/41	1		ENSP00000418285.1
COL6A3	ENST00000353578.9	c.5152G>A	p.Val1718Ile	missense_variant	11/43	5		ENSP00000315873.4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152190 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000130 AC: 19 AN: 1461890 Hom.: 0 Cov.: 32 AF XY: 0.0000124 AC XY: 9 AN XY: 727248

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152190 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74342

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.00000756

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Bethlem myopathy 1A Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 26, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.078
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	6.5
DANN	Benign	0.78
DEOGEN2	Benign	0.21	.;T;.;T;.
Eigen	Benign	-0.93
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.070	N
LIST_S2	Benign	0.73	T;T;T;T;.
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.12	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.7	.;L;.;.;.
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.14	N;N;N;.;N
REVEL	Benign	0.0060
Sift	Benign	0.40	T;T;T;.;T
Sift4G	Benign	0.082	T;T;T;T;T
Polyphen		0.86	P;B;.;.;P
Vest4		0.14
MutPred		0.38		.;Loss of helix (P = 0.0237);.;.;.;
MVP		0.34
MPC		0.13
ClinPred		0.083	T
GERP RS		0.28
Varity_R		0.029
gMVP		0.17

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

LitVar

Other links and lift over

dbSNP: rs778162038; hg19: chr2-238274409; COSMIC: COSV55088979;