21-45990826-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_001848.3(COL6A1):c.1056C>T(p.Asp352Asp) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000788 in 1,613,360 control chromosomes in the GnomAD database, including 12 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 0.0039 ( 4 hom., cov: 33)

Exomes 𝑓: 0.00046 ( 8 hom. )

Consequence

COL6A1
NM_001848.3 splice_region, synonymous

Scores

Splicing: ADA: 0.0003730

Clinical Significance

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

Conservation

PhyloP100: -2.48

Variant links:

Genes affected

COL6A1 (HGNC:2211): (collagen type VI alpha 1 chain) The collagens are a superfamily of proteins that play a role in maintaining the integrity of various tissues. Collagens are extracellular matrix proteins and have a triple-helical domain as their common structural element. Collagen VI is a major structural component of microfibrils. The basic structural unit of collagen VI is a heterotrimer of the alpha1(VI), alpha2(VI), and alpha3(VI) chains. The alpha2(VI) and alpha3(VI) chains are encoded by the COL6A2 and COL6A3 genes, respectively. The protein encoded by this gene is the alpha 1 subunit of type VI collagen (alpha1(VI) chain). Mutations in the genes that code for the collagen VI subunits result in the autosomal dominant disorder, Bethlem myopathy. [provided by RefSeq, Jul 2008]

COL6A1 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.68).

BP6

Variant 21-45990826-C-T is Benign according to our data. Variant chr21-45990826-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 93803.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr21-45990826-C-T is described in Lovd as [Benign]. Variant chr21-45990826-C-T is described in Lovd as [Likely_benign].

BP7

Synonymous conserved (PhyloP=-2.48 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00389 (592/152270) while in subpopulation AFR AF= 0.0134 (556/41546). AF 95% confidence interval is 0.0125. There are 4 homozygotes in gnomad4. There are 278 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 4 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A1	NM_001848.3 link	c.1056C>T	p.Asp352Asp	splice_region_variant, synonymous_variant	Exon 14 of 35	ENST00000361866.8	NP_001839.2	P12109A0A384P5H7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A1	ENST00000361866.8 link	c.1056C>T	p.Asp352Asp	splice_region_variant, synonymous_variant	Exon 14 of 35	1	NM_001848.3	ENSP00000355180.3		P12109

Frequencies

GnomAD3 genomes

AF:

0.00388

AC:

590

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0134

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00105

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00145

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00191

GnomAD3 exomes

AF:

0.00124

AC:

310

AN:

250922

Hom.:

AF XY:

0.000972

AC XY:

132

AN XY:

135818

show subpopulations

Gnomad AFR exome

AF:

0.0138

Gnomad AMR exome

AF:

0.00110

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00147

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000265

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000465

AC:

679

AN:

1461090

Hom.:

Cov.:

AF XY:

0.000465

AC XY:

338

AN XY:

726860

show subpopulations

Gnomad4 AFR exome

AF:

0.0114

Gnomad4 AMR exome

AF:

0.00107

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00168

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000351

Gnomad4 OTH exome

AF:

0.00103

GnomAD4 genome

AF:

0.00389

AC:

592

AN:

152270

Hom.:

Cov.:

AF XY:

0.00373

AC XY:

278

AN XY:

74454

show subpopulations

Gnomad4 AFR

AF:

0.0134

Gnomad4 AMR

AF:

0.00105

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00145

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00189

Alfa

AF:

0.00101

Hom.:

Bravo

AF:

0.00403

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Sep 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

COL6A1: BP4, BP7, BS1 -

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Nov 18, 2019

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Benign:1

Aug 27, 2012

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Bethlem myopathy 1A

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Collagen 6-related myopathy

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

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

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.68

CADD

Benign

0.053

DANN

Benign

0.75

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00037

dbscSNV1_RF

Benign

0.22

SpliceAI score (max)

0.050

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