rs768906709

chr21-46001259-A-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001848.3(COL6A1):c.1829A>C(p.Lys610Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000131 in 1,455,630 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K610N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: COL6A1 NM_001848.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:1
• Conservation: PhyloP100: 0.775

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 Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.093262196).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL6A1	NM_001848.3	c.1829A>C	p.Lys610Thr	missense_variant	30/35	ENST00000361866.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A1	ENST00000361866.8	c.1829A>C	p.Lys610Thr	missense_variant	30/35	1	NM_001848.3	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.0000568 AC: 14 AN: 246588 Hom.: 0 AF XY: 0.0000672 AC XY: 9 AN XY: 133950

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000405

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000131 AC: 19 AN: 1455630 Hom.: 0 Cov.: 32 AF XY: 0.0000138 AC XY: 10 AN XY: 724368

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000425

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.0000340

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Aug 28, 2020	Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant does not alter protein structure/function -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 14, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 16, 2020	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Aug 02, 2016

- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 08, 2021

The c.1829A>C (p.K610T) alteration is located in exon 30 (coding exon 30) of the COL6A1 gene. This alteration results from a A to C substitution at nucleotide position 1829, causing the lysine (K) at amino acid position 610 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Bethlem myopathy 1A Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Aug 16, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.30
Cadd	Benign	15
Dann	Uncertain	0.98
DEOGEN2	Benign	0.32	T;T
Eigen	Benign	-0.88
Eigen_PC	Benign	-0.75
FATHMM_MKL	Benign	0.0035	N
LIST_S2	Benign	0.74	T;T
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.093	T;T
MetaSVM	Benign	-0.70	T
MutationAssessor	Benign	0.45	N;.
MutationTaster	Benign	0.83	N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.2	N;.
REVEL	Benign	0.22
Sift	Benign	0.40	T;.
Sift4G	Benign	0.49	T;T
Polyphen		0.0	B;.
Vest4		0.36
MutPred		0.48		Loss of methylation at K610 (P = 0);.;
MVP		0.32
MPC		0.28
ClinPred		0.036	T
GERP RS		1.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.034
gMVP		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs768906709; hg19: chr21-47421173;