rs1553553313

Positions:

• chr2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_004369.4(COL6A3):​c.6212_6309+28del variant causes a splice acceptor, splice donor, splice donor 5th base, coding sequence, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. G2071G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: COL6A3 NM_004369.4 splice_acceptor, splice_donor, splice_donor_5th_base, coding_sequence, intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.38

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_pathogenic. Variant got 6 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.002727082 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A is Pathogenic according to our data. Variant chr2-237359333-ATTTGTAAAACAAAACCAAGCTTGCATACCTTCTCTCCTGGGAATCCCCGAGAGCCCTAGAAGGCAAGGCGATAGGGGAAGCATTAGCTTTTCCTGCAGGGCTGGTCCCTCGGGCAGAAGAGGCCAAGGGCTGTTCCCCCACTCCACCCCATTTGAATGTTGCAGTGTCTGAAAATGTAATATTAGAGTCCTACCCCTTTGGATTCCTCTCTCACCACCACGTGCGATGTTTTAAAACTAAAACTAGAACTGAATGCTTGGGTGGTCTTGGCTCCCTGGGCCGGCGGGGGTGGACCCCAAAACCCAGGGCAAGGAGCTGACTTTGTAACTTTGCAGCCCTTCCCTTCAGCACCTGCCTTCAAACTTCAGCAAACAGAGAAGCAAGTTCACCAGCCTTCAACCCACCTGCTGTCCTCTCACTCCACTCCCTTCCCTGACTGCTCCCACGGTCCAGGGCCGGGGCCGTGGGCACCAGCCTACCCTCCGCCCTGGCCCATGTTCTCTCCTTGTGAGGGTTTCCTGGCTTCTTCATGTTTCCACAGGAAACTATTTCTCCATTCTCAGGCTCCCCACCAGCTGCAGCCCCTGCTCCTGAACCCACCCTGCTCAGAACTGCCTTCCAATGAGAGGTCACGGGCTGCTGAATGCTGAGGTCAAGAAGCCTGGACCAGCGCCTCCCTCCCTGGCAGCATCTGGAGAAACTGCGAGTCACCTGACCCCTCCCCACGCTAGCAACCCCATCACCCACGCCTCACCTTTACTCCTCTCTGGCCCGGGCAGCCCTGGAAACCTTGAGTGCCGTTCACACCAGGCGGACCACGCTCAC-A is described in ClinVar as [Pathogenic]. Clinvar id is 542995.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL6A3	NM_004369.4	c.6212_6309+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	17/44	ENST00000295550.9
COL6A3	NM_057166.5	c.4391_4488+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	14/41
COL6A3	NM_057167.4	c.5594_5691+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	16/43

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A3	ENST00000295550.9	c.6212_6309+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	17/44	1	NM_004369.4	P1
COL6A3	ENST00000472056.5	c.4391_4488+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	14/41	1
COL6A3	ENST00000353578.9	c.5594_5691+28del		splice_acceptor_variant, splice_donor_variant, splice_donor_5th_base_variant, coding_sequence_variant, intron_variant	16/43	5

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Dec 11, 2017

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

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1553553313; hg19: chr2-238267976;