chr2-237353302-A-G

Variant names:

• chr2-237353302-A-G
• rs58342729
• NM_004369.4:c.6690+39T>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_004369.4(COL6A3):​c.6690+39T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00258 in 1,595,028 control chromosomes in the GnomAD database, including 84 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.014 (46 hom., cov: 32)
  • Exomes 𝑓: 0.0014 (38 hom.)
• Consequence: COL6A3 NM_004369.4 intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.0180
• 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: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 2-237353302-A-G is Benign according to our data. Variant chr2-237353302-A-G is described in ClinVar as Likely_benign. ClinVar VariationId is 259312.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0137 (2086/152298) while in subpopulation AFR AF = 0.0478 (1987/41552). AF 95% confidence interval is 0.0461. There are 46 homozygotes in GnomAd4. There are 976 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 46 AD,AR,SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A3	NM_004369.4	c.6690+39T>C		intron_variant	Intron 25 of 43	ENST00000295550.9	NP_004360.2
COL6A3	NM_057167.4	c.6072+39T>C		intron_variant	Intron 24 of 42		NP_476508.2
COL6A3	NM_057166.5	c.4869+39T>C		intron_variant	Intron 22 of 40		NP_476507.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A3	ENST00000295550.9	c.6690+39T>C		intron_variant	Intron 25 of 43	1	NM_004369.4	ENSP00000295550.4
COL6A3	ENST00000472056.5	c.4869+39T>C		intron_variant	Intron 22 of 40	1		ENSP00000418285.1
COL6A3	ENST00000353578.9	c.6072+39T>C		intron_variant	Intron 24 of 42	5		ENSP00000315873.4
COL6A3	ENST00000491769.1	n.944+39T>C		intron_variant	Intron 2 of 19	5

Frequencies

GnomAD3 genomes AF: 0.0137 AC: 2083 AN: 152180 Hom.: 46 Cov.: 32

Gnomad AFR AF: 0.0479

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00445

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: 0.000132

Gnomad OTH AF: 0.0105

GnomAD2 exomes AF: 0.00351 AC: 877 AN: 249580 AF XY: 0.00239

Gnomad AFR exome AF: 0.0487

Gnomad AMR exome AF: 0.00221

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000531

Gnomad OTH exome AF: 0.00230

GnomAD4 exome AF: 0.00140 AC: 2027 AN: 1442730 Hom.: 38 Cov.: 27 AF XY: 0.00118 AC XY: 849 AN XY: 718862

African (AFR) AF: 0.0497 AC: 1644 AN: 33076

American (AMR) AF: 0.00263 AC: 117 AN: 44566

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25978

East Asian (EAS) AF: 0.00 AC: 0 AN: 39604

South Asian (SAS) AF: 0.000128 AC: 11 AN: 85642

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53170

Middle Eastern (MID) AF: 0.00314 AC: 18 AN: 5732

European-Non Finnish (NFE) AF: 0.0000347 AC: 38 AN: 1095244

Other (OTH) AF: 0.00333 AC: 199 AN: 59718

GnomAD4 genome AF: 0.0137 AC: 2086 AN: 152298 Hom.: 46 Cov.: 32 AF XY: 0.0131 AC XY: 976 AN XY: 74466

African (AFR) AF: 0.0478 AC: 1987 AN: 41552

American (AMR) AF: 0.00444 AC: 68 AN: 15302

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

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

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 68026

Other (OTH) AF: 0.0104 AC: 22 AN: 2116

Alfa AF: 0.00642 Hom.: 7

Bravo AF: 0.0154

Asia WGS AF: 0.00260 AC: 9 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:1

Jun 18, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	1.8
DANN	Benign	0.61
PhyloP100		-0.018
Mutation Taster		=100/0	polymorphism (auto)

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: rs58342729; hg19: chr2-238261945;