rs144334894

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PP3_ModerateBP6

The NM_001849.4(COL6A2):c.1674G>A(p.Ala558Ala) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000224 in 1,612,912 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00019 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00023 ( 0 hom. )

Consequence

COL6A2
NM_001849.4 splice_region, synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:3

Conservation

PhyloP100: -2.91

Variant links:

Genes affected

COL6A2 (HGNC:2212): (collagen type VI alpha 2 chain) This gene encodes one of the three alpha chains of type VI collagen, a beaded filament collagen found in most connective tissues. The product of this gene contains several domains similar to von Willebrand Factor type A domains. 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 this gene are associated with Bethlem myopathy and Ullrich scleroatonic muscular dystrophy. Three transcript variants have been identified for this gene. [provided by RefSeq, Jul 2008]

COL6A2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BP6

Variant 21-46124653-G-A is Benign according to our data. Variant chr21-46124653-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 340368.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=3}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A2	NM_001849.4 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 22 of 28	ENST00000300527.9	NP_001840.3	P12110-1A0A384MDP3
COL6A2	NM_058174.3 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 22 of 28		NP_478054.2	P12110-2
COL6A2	NM_058175.3 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 22 of 28		NP_478055.2	P12110-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL6A2	ENST00000300527.9 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 22 of 28	1	NM_001849.4	ENSP00000300527.4	P12110-1
COL6A2	ENST00000397763.6 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 22 of 28	5		ENSP00000380870.1	P12110-2
COL6A2	ENST00000409416.6 link	c.1674G>A	p.Ala558Ala	splice_region_variant, synonymous_variant	Exon 21 of 27	5		ENSP00000387115.1	P12110-3
COL6A2	ENST00000413758.1 link	c.297G>A	p.Ala99Ala	splice_region_variant, synonymous_variant	Exon 7 of 11	3		ENSP00000395751.1	H7C0M5

Frequencies

GnomAD3 genomes

AF:

0.000191

AC:

AN:

152086

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000413

Gnomad FIN

AF:

0.000377

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000216

AC:

AN:

250058

Hom.:

AF XY:

0.000280

AC XY:

AN XY:

135630

show subpopulations

Gnomad AFR exome

AF:

0.0000624

Gnomad AMR exome

AF:

0.000203

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000545

Gnomad SAS exome

AF:

0.000261

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.000284

Gnomad OTH exome

AF:

0.000328

GnomAD4 exome

AF:

0.000227

AC:

332

AN:

1460708

Hom.:

Cov.:

AF XY:

0.000250

AC XY:

182

AN XY:

726668

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.000290

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000251

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.000191

AC:

AN:

152204

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74416

show subpopulations

Gnomad4 AFR

AF:

0.000193

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.000377

Gnomad4 NFE

AF:

0.000191

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000132

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Nov 14, 2017

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 27, 2023

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP3 -

May 09, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports a deleterious effect on splicing; Has not been previously published as pathogenic or benign to our knowledge -

Myosclerosis

Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Collagen 6-related myopathy

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Bethlem myopathy 1A

Benign:1

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.83

CADD

Benign

DANN

Benign

0.64

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.82

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.82

Position offset: 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