21-46122529-G-A

Position:

chr21-46122529-G-A

Variant summary

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

The NM_001849.4(COL6A2):c.1606G>A(p.Glu536Lys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00013 in 1,612,648 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/23 in silico tools predict 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

COL6A2
NM_001849.4 missense, splice_region

Scores

Splicing: ADA: 0.0003318

Clinical Significance

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

Conservation

PhyloP100: 1.39

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=0.06379464).

BP6

Variant 21-46122529-G-A is Benign according to our data. Variant chr21-46122529-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 476454.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=1, Uncertain_significance=3}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
COL6A2	NM_001849.4 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	20/28	ENST00000300527.9	NP_001840.3
COL6A2	NM_058174.3 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	20/28	ENST00000397763.6	NP_478054.2
COL6A2	NM_058175.3 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	20/28		NP_478055.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL6A2	ENST00000300527.9 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	20/28	1	NM_001849.4	ENSP00000300527	P1	P12110-1
COL6A2	ENST00000397763.6 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	20/28	5	NM_058174.3	ENSP00000380870		P12110-2
COL6A2	ENST00000409416.6 linkuse as main transcript	c.1606G>A	p.Glu536Lys	missense_variant, splice_region_variant	19/27	5		ENSP00000387115		P12110-3
COL6A2	ENST00000413758.1 linkuse as main transcript	c.229G>A	p.Glu77Lys	missense_variant, splice_region_variant	5/11	3		ENSP00000395751

Frequencies

GnomAD3 genomes

AF:

0.0000855

AC:

AN:

152056

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000173

AC:

AN:

249096

Hom.:

AF XY:

0.000148

AC XY:

AN XY:

135368

show subpopulations

Gnomad AFR exome

AF:

0.0000626

Gnomad AMR exome

AF:

0.000782

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000893

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.000135

AC:

197

AN:

1460474

Hom.:

Cov.:

AF XY:

0.000111

AC XY:

AN XY:

726524

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000738

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.0000192

Gnomad4 NFE exome

AF:

0.000130

Gnomad4 OTH exome

AF:

0.000215

GnomAD4 genome

AF:

0.0000854

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74384

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000239

Hom.:

Bravo

AF:

0.000128

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000173

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000273

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 10, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 16, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 14, 2022	Reported as a variant of uncertain significance in a patient with suspected limb-girdle muscular dystrophy (Nallamilli et al., 2018); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 30564623) -

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. -

Bethlem myopathy 1A

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 18, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.12

CADD

Benign

DANN

Benign

0.93

DEOGEN2

Benign

0.23

T;.;.;.;T

Eigen

Benign

-0.58

Eigen_PC

Benign

-0.38

FATHMM_MKL

Benign

0.45

LIST_S2

Uncertain

0.97

D;D;.;D;D

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.064

T;T;T;T;T

MetaSVM

Benign

-0.37

MutationAssessor

Benign

-0.81

N;N;N;N;.

MutationTaster

Benign

0.65

N;N;N;N;N

PrimateAI

Uncertain

0.70

PROVEAN

Benign

0.060

N;N;N;N;N

REVEL

Uncertain

0.41

Sift

Benign

0.61

T;T;T;T;T

Sift4G

Benign

0.86

T;T;T;T;T

Polyphen

0.095

B;B;B;B;.

Vest4

0.35

MVP

0.96

MPC

0.16

ClinPred

0.045

GERP RS

4.3

Varity_R

0.074

gMVP

0.25

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00033

dbscSNV1_RF

Benign

0.016

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