chr21-45988876-G-C

Variant names:

• chr21-45988876-G-C
• rs2839076
• NM_001848.3:c.805-208G>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_001848.3(COL6A1):​c.805-208G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.157 in 152,070 control chromosomes in the GnomAD database, including 3,061 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency: Genomes: 𝑓 0.16 (3061 hom., cov: 32)
• Consequence: COL6A1 NM_001848.3 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -4.48
• Publications: 2 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):

• collagen 6-related myopathy

  Inheritance: AD, AR Classification: DEFINITIVE Submitted by: ClinGen
• Bethlem myopathy 1A

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P
• Ullrich congenital muscular dystrophy 1A

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

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 21-45988876-G-C is Benign according to our data. Variant chr21-45988876-G-C is described in ClinVar as [Benign]. Clinvar id is 1269967.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.352 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL6A1	NM_001848.3	c.805-208G>C		intron_variant	Intron 8 of 34	ENST00000361866.8	NP_001839.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL6A1	ENST00000361866.8	c.805-208G>C		intron_variant	Intron 8 of 34	1	NM_001848.3	ENSP00000355180.3

Frequencies

GnomAD3 genomes AF: 0.157 AC: 23863 AN: 151952 Hom.: 3055 Cov.: 32

Gnomad AFR AF: 0.357

Gnomad AMI AF: 0.0175

Gnomad AMR AF: 0.0928

Gnomad ASJ AF: 0.0841

Gnomad EAS AF: 0.0646

Gnomad SAS AF: 0.119

Gnomad FIN AF: 0.0411

Gnomad MID AF: 0.101

Gnomad NFE AF: 0.0846

Gnomad OTH AF: 0.129

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.157 AC: 23900 AN: 152070 Hom.: 3061 Cov.: 32 AF XY: 0.152 AC XY: 11289 AN XY: 74342

African (AFR) AF: 0.357 AC: 14772 AN: 41398

American (AMR) AF: 0.0927 AC: 1417 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.0841 AC: 292 AN: 3472

East Asian (EAS) AF: 0.0648 AC: 335 AN: 5172

South Asian (SAS) AF: 0.120 AC: 579 AN: 4816

European-Finnish (FIN) AF: 0.0411 AC: 436 AN: 10612

Middle Eastern (MID) AF: 0.105 AC: 31 AN: 294

European-Non Finnish (NFE) AF: 0.0846 AC: 5752 AN: 67994

Other (OTH) AF: 0.128 AC: 270 AN: 2110

Alfa AF: 0.123 Hom.: 236

Bravo AF: 0.168

Asia WGS AF: 0.0910 AC: 320 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Jun 26, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.26
DANN	Benign	0.76
PhyloP100		-4.5
Mutation Taster		=100/0	polymorphism (auto)

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: rs2839076; hg19: chr21-47408790;