NM_001849.4:c.1466G>T

Variant names:

• chr21-46121563-G-T
• NM_001849.4:c.1466G>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001849.4(COL6A2):​c.1466G>T​(p.Arg489Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,460,512 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. R489Q) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: COL6A2 NM_001849.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.63

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.752

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A2	NM_001849.4	c.1466G>T	p.Arg489Leu	missense_variant	Exon 18 of 28	ENST00000300527.9	NP_001840.3
COL6A2	NM_058174.3	c.1466G>T	p.Arg489Leu	missense_variant	Exon 18 of 28		NP_478054.2
COL6A2	NM_058175.3	c.1466G>T	p.Arg489Leu	missense_variant	Exon 18 of 28		NP_478055.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A2	ENST00000300527.9	c.1466G>T	p.Arg489Leu	missense_variant	Exon 18 of 28	1	NM_001849.4	ENSP00000300527.4
COL6A2	ENST00000397763.6	c.1466G>T	p.Arg489Leu	missense_variant	Exon 18 of 28	5		ENSP00000380870.1
COL6A2	ENST00000409416.6	c.1466G>T	p.Arg489Leu	missense_variant	Exon 17 of 27	5		ENSP00000387115.1
COL6A2	ENST00000413758.1	c.89G>T	p.Arg30Leu	missense_variant	Exon 3 of 11	3		ENSP00000395751.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460512 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 726562

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.57	D;.;.;.;D
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.91	D;D;.;D;D
M_CAP	Pathogenic	0.52	D
MetaRNN	Pathogenic	0.75	D;D;D;D;D
MetaSVM	Uncertain	0.71	D
MutationAssessor	Uncertain	2.1	M;M;M;M;.
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-3.3	D;D;D;D;D
REVEL	Pathogenic	0.70
Sift	Benign	0.067	T;D;D;T;T
Sift4G	Benign	0.080	T;T;T;T;T
Polyphen		0.99	D;D;D;D;.
Vest4		0.71
MutPred		0.47		Loss of methylation at R489 (P = 0.0134);Loss of methylation at R489 (P = 0.0134);Loss of methylation at R489 (P = 0.0134);Loss of methylation at R489 (P = 0.0134);.;
MVP		0.98
MPC		0.23
ClinPred		0.96	D
GERP RS		4.2
Varity_R		0.25
gMVP		0.45

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr21-47541477;