21-45987024-C-A

Position:

• chr21-45987024-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000361866.8(COL6A1):​c.669C>A​(p.Asp223Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D223N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: COL6A1 ENST00000361866.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.587

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.18885878).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL6A1	NM_001848.3	c.669C>A	p.Asp223Glu	missense_variant	5/35	ENST00000361866.8	NP_001839.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL6A1	ENST00000361866.8	c.669C>A	p.Asp223Glu	missense_variant	5/35	1	NM_001848.3	ENSP00000355180	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.72
CADD	Benign	0.42
DANN	Uncertain	0.99
DEOGEN2	Benign	0.30	T;T
Eigen	Benign	-0.78
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.062	N
LIST_S2	Benign	0.65	T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L;.
MutationTaster	Benign	0.99	N
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.6	N;.
REVEL	Benign	0.064
Sift	Benign	0.099	T;.
Sift4G	Benign	0.067	T;T
Polyphen		0.70	P;.
Vest4		0.23
MutPred		0.45		Gain of disorder (P = 0.151);Gain of disorder (P = 0.151);
MVP		0.44
MPC		0.21
ClinPred		0.73	D
GERP RS		-2.4
Varity_R		0.067
gMVP		0.66

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

Other links and lift over

dbSNP: rs552000247; hg19: chr21-47406938;