21-46003537-G-C

Variant names:

• chr21-46003537-G-C
• rs374685631
• NM_001848.3:c.2611G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001848.3(COL6A1):​c.2611G>C​(p.Val871Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V871M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 35)
• Consequence: COL6A1 NM_001848.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.39
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Bethlem myopathy 1A

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P
• collagen 6-related myopathy

  Inheritance: SD, AD, AR Classification: DEFINITIVE Submitted by: ClinGen
• Ullrich congenital muscular dystrophy 1A

  Inheritance: AD, AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• Bethlem myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Ullrich congenital muscular dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001848.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A1	NM_001848.3	MANE Select	c.2611G>C	p.Val871Leu	missense	Exon 35 of 35	NP_001839.2	P12109

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL6A1	ENST00000361866.8	TSL:1 MANE Select	c.2611G>C	p.Val871Leu	missense	Exon 35 of 35	ENSP00000355180.3	P12109
	COL6A1	ENST00000498614.5	TSL:1	n.845G>C		non_coding_transcript_exon	Exon 6 of 6
	COL6A1	ENST00000866134.1		c.925G>C	p.Val309Leu	missense	Exon 7 of 7	ENSP00000536193.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome Cov.: 80

GnomAD4 genome Cov.: 35

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Bethlem myopathy 1A (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Benign	22
DANN	Benign	0.95
DEOGEN2	Benign	0.35	T
Eigen	Uncertain	0.26
Eigen_PC	Benign	0.19
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.76	T
M_CAP	Uncertain	0.19	D
MetaRNN	Uncertain	0.48	T
MetaSVM	Uncertain	0.17	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		5.4
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-1.7	N
REVEL	Uncertain	0.64
Sift	Benign	0.070	T
Sift4G	Uncertain	0.026	D
Polyphen		1.0	D
Vest4		0.35
MutPred		0.61		Gain of catalytic residue at V871 (P = 0.0281)
MVP		0.70
MPC		0.76
ClinPred		0.96	D
GERP RS		4.8
Varity_R		0.20
gMVP		0.63
Mutation Taster		=65/35	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs374685631; hg19: chr21-47423451;