rs1553553313

Variant names:

• chr2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A
• rs1553553313
• NM_004369.4:c.6212_6309+28del

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PP5_Moderate

The NM_004369.4(COL6A3):​c.6212_6309+28del variant causes a exon loss change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: COL6A3 NM_004369.4 exon_loss
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.38
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PP5: Variant 2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A is Pathogenic according to our data. Variant chr2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A is described in ClinVar as Pathogenic. ClinVar VariationId is 542995.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A3	NM_004369.4	c.6212_6309+28del		exon_loss_variant	Exon 18 of 44	ENST00000295550.9	NP_004360.2
COL6A3	NM_004369.4	c.6212_6309+28del	p.Glu2072fs	frameshift_variant	Exon 18 of 44	ENST00000295550.9	NP_004360.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A3	ENST00000295550.9	c.6212_6309+28del		exon_loss_variant	Exon 18 of 44	1	NM_004369.4	ENSP00000295550.4
COL6A3	ENST00000295550.9	c.6212_6309+28del	p.Glu2072fs	frameshift_variant	Exon 18 of 44	1	NM_004369.4	ENSP00000295550.4

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Bethlem myopathy 1A Pathogenic:1

Dec 11, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is a gross deletion of the genomic region encompassing the last 71 nucleotides of exon 17 and all of exon 18 of the COL6A3 gene, including the intron 17, exon 18 boundary (c.6212_6309+29del). This likely creates a premature translational stop signal and is expected to result in an absent or disrupted protein product. This variant has not been reported in the literature in individuals with COL6A3-related disease. Loss-of-function variants in COL6A3 are known to be pathogenic (PMID: 17886299, 11992252). For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.4

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553553313; hg19: chr2-238267976;