chr21-46132097-G-T

Position:

chr21-46132097-G-T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_001849.4(COL6A2):c.2605G>T(p.Asp869Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000135 in 1,595,502 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00078 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000067 ( 0 hom. )

Consequence

COL6A2
NM_001849.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:3

Conservation

PhyloP100: 1.24

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 Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009386629).

BP6

Variant 21-46132097-G-T is Benign according to our data. Variant chr21-46132097-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 196123.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=1, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL6A2	NM_001849.4 linkuse as main transcript	c.2605G>T	p.Asp869Tyr	missense_variant	28/28	ENST00000300527.9	NP_001840.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL6A2	ENST00000300527.9 linkuse as main transcript	c.2605G>T	p.Asp869Tyr	missense_variant	28/28	1	NM_001849.4	ENSP00000300527	P1	P12110-1

Frequencies

GnomAD3 genomes

AF:

0.000782

AC:

119

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00275

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.000478

GnomAD3 exomes

AF:

0.000166

AC:

AN:

210720

Hom.:

AF XY:

0.0000861

AC XY:

AN XY:

116084

show subpopulations

Gnomad AFR exome

AF:

0.00236

Gnomad AMR exome

AF:

0.0000952

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000358

Gnomad FIN exome

AF:

0.0000673

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000672

AC:

AN:

1443218

Hom.:

Cov.:

AF XY:

0.0000488

AC XY:

AN XY:

717496

show subpopulations

Gnomad4 AFR exome

AF:

0.00230

Gnomad4 AMR exome

AF:

0.000164

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000119

Gnomad4 FIN exome

AF:

0.0000421

Gnomad4 NFE exome

AF:

9.04e-7

Gnomad4 OTH exome

AF:

0.000168

GnomAD4 genome

AF:

0.000781

AC:

119

AN:

152284

Hom.:

Cov.:

AF XY:

0.000604

AC XY:

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.00274

Gnomad4 AMR

AF:

0.000196

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:

0.000473

Alfa

AF:

0.0000340

Hom.:

Bravo

AF:

0.000846

ESP6500AA

AF:

0.00251

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000193

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 21, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 30, 2017	A variant of uncertain significance has been identified in the COL6A2 gene. The D869Y variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The D869Y variant is observed in 16/4574 (0.4%) alleles from individuals of African background, in the ExAC dataset (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The D869Y variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. However, this substitution occurs at a position that is not conserved. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Myosclerosis

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Bethlem myopathy 1A

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 24, 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.25

CADD

Benign

DANN

Benign

0.59

DEOGEN2

Benign

0.27

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.59

FATHMM_MKL

Benign

0.21

LIST_S2

Benign

0.79

M_CAP

Uncertain

0.18

MetaRNN

Benign

0.0094

MetaSVM

Benign

-0.50

MutationAssessor

Benign

1.7

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-1.6

REVEL

Benign

0.26

Sift

Benign

0.032

Sift4G

Uncertain

0.038

Polyphen

0.24

Vest4

0.42

MVP

0.87

MPC

0.38

ClinPred

0.028

GERP RS

3.2

Varity_R

0.14

gMVP

0.75

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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