rs202091342

Positions:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_004369.4(COL6A3):c.6064-6C>T variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000502 in 1,612,502 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00040 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00051 ( 6 hom. )

Consequence

COL6A3
NM_004369.4 splice_region, splice_polypyrimidine_tract, intron

Scores

Splicing: ADA: 0.00003464

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 0.280

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.84).

BP6

Variant 2-237361837-G-A is Benign according to our data. Variant chr2-237361837-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 259309.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.000512 (748/1460198) while in subpopulation SAS AF= 0.00615 (530/86234). AF 95% confidence interval is 0.00571. There are 6 homozygotes in gnomad4_exome. There are 499 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 6 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
COL6A3	NM_004369.4 linkuse as main transcript	c.6064-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant	ENST00000295550.9
COL6A3	NM_057166.5 linkuse as main transcript	c.4243-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant
COL6A3	NM_057167.4 linkuse as main transcript	c.5446-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Appris	UniProt
COL6A3	ENST00000295550.9 linkuse as main transcript	c.6064-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant	1	NM_004369.4	P1	P12111-1
COL6A3	ENST00000472056.5 linkuse as main transcript	c.4243-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant	1			P12111-4
COL6A3	ENST00000353578.9 linkuse as main transcript	c.5446-6C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant	5			P12111-2

Frequencies

GnomAD3 genomes

AF:

0.000401

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000386

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00118

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00123

AC:

309

AN:

251422

Hom.:

AF XY:

0.00142

AC XY:

193

AN XY:

135902

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.00318

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00575

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000791

Gnomad OTH exome

AF:

0.000978

GnomAD4 exome

AF:

0.000512

AC:

748

AN:

1460198

Hom.:

Cov.:

AF XY:

0.000687

AC XY:

499

AN XY:

726578

show subpopulations

Gnomad4 AFR exome

AF:

0.000538

Gnomad4 AMR exome

AF:

0.00284

Gnomad4 ASJ exome

AF:

0.0000766

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00615

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000306

Gnomad4 OTH exome

AF:

0.000514

GnomAD4 genome

AF:

0.000401

AC:

AN:

152304

Hom.:

Cov.:

AF XY:

0.000483

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.000385

Gnomad4 AMR

AF:

0.00118

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000176

Hom.:

Bravo

AF:

0.000510

Asia WGS

AF:

0.00260

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 07, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 04, 2024	Variant summary: COL6A3 c.6064-6C>T alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. Consensus agreement among computation tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.0005 in 1612502 control chromosomes, predominantly at a frequency of 0.006 within the South Asian subpopulation in the gnomAD database, including 6 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database (v4.0.0) strongly suggests that the variant is a benign polymorphism found primarily in populations of South Asian origin. To our knowledge, no occurrence of c.6064-6C>T in individuals affected with Ullrich Congenital Muscular Dystrophy 1 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 259309). Based on the evidence outlined above, the variant was classified as benign. -

Bethlem myopathy 1A

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 15, 2024

- -

Collagen 6-related myopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Sep 01, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.84

CADD

Benign

1.3

DANN

Benign

0.53

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000035

dbscSNV1_RF

Benign

0.018

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over