21-45999692-C-T

Position:

chr21-45999692-C-T

Variant summary

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

The NM_001848.3(COL6A1):c.1776C>T(p.Asp592Asp) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000257 in 1,612,262 control chromosomes in the GnomAD database, including 5 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 0.0013 ( 3 hom., cov: 30)

Exomes 𝑓: 0.00015 ( 2 hom. )

Consequence

COL6A1
NM_001848.3 splice_region, synonymous

Scores

Splicing: ADA: 0.0002974

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -1.21

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.61).

BP6

Variant 21-45999692-C-T is Benign according to our data. Variant chr21-45999692-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 284835.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-1.21 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00129 (196/151692) while in subpopulation AFR AF= 0.00419 (173/41324). AF 95% confidence interval is 0.00368. There are 3 homozygotes in gnomad4. There are 99 alleles in male gnomad4 subpopulation. Median coverage is 30. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL6A1	NM_001848.3 link	c.1776C>T	p.Asp592Asp	splice_region_variant, synonymous_variant	27/35	ENST00000361866.8	NP_001839.2	P12109A0A384P5H7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL6A1	ENST00000361866.8 link	c.1776C>T	p.Asp592Asp	splice_region_variant, synonymous_variant	27/35	1	NM_001848.3	ENSP00000355180.3		P12109
COL6A1	ENST00000466285.1 link	n.293C>T		splice_region_variant, non_coding_transcript_exon_variant	1/3	3

Frequencies

GnomAD3 genomes

AF:

0.00123

AC:

186

AN:

151570

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00396

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000961

GnomAD3 exomes

AF:

0.000353

AC:

AN:

249336

Hom.:

AF XY:

0.000289

AC XY:

AN XY:

135146

show subpopulations

Gnomad AFR exome

AF:

0.00462

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.000200

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.000657

GnomAD4 exome

AF:

0.000150

AC:

219

AN:

1460570

Hom.:

Cov.:

AF XY:

0.000127

AC XY:

AN XY:

726568

show subpopulations

Gnomad4 AFR exome

AF:

0.00478

Gnomad4 AMR exome

AF:

0.000224

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000810

Gnomad4 OTH exome

AF:

0.000613

GnomAD4 genome

AF:

0.00129

AC:

196

AN:

151692

Hom.:

Cov.:

AF XY:

0.00134

AC XY:

AN XY:

74108

show subpopulations

Gnomad4 AFR

AF:

0.00419

Gnomad4 AMR

AF:

0.00131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000951

Alfa

AF:

0.000393

Hom.:

Bravo

AF:

0.00160

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2024	COL6A1: BP4, BP7, BS2 -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 07, 2020	- -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jan 03, 2016

- -

Collagen 6-related myopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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. -

Bethlem myopathy 1A

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 18, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.61

CADD

Benign

0.056

DANN

Benign

0.70

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00030

dbscSNV1_RF

Benign

0.11

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