21-45987627-G-A

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_001848.3(COL6A1):​c.777G>A​(p.Pro259=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000868 in 1,611,166 control chromosomes in the GnomAD database, including 17 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0045 ( 9 hom., cov: 32)
Exomes 𝑓: 0.00049 ( 8 hom. )

Consequence

COL6A1
NM_001848.3 synonymous

Scores

2

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -8.49
Variant links:
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]

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.64).
BP6
Variant 21-45987627-G-A is Benign according to our data. Variant chr21-45987627-G-A is described in ClinVar as [Benign]. Clinvar id is 258306.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
BP7
Synonymous conserved (PhyloP=-8.49 with no splicing effect.
BS1
Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00446 (679/152258) while in subpopulation AFR AF= 0.0159 (661/41540). AF 95% confidence interval is 0.0149. There are 9 homozygotes in gnomad4. There are 328 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
BS2
High Homozygotes in GnomAd4 at 9 AD,AR gene

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
COL6A1NM_001848.3 linkuse as main transcriptc.777G>A p.Pro259= synonymous_variant 8/35 ENST00000361866.8 NP_001839.2

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
COL6A1ENST00000361866.8 linkuse as main transcriptc.777G>A p.Pro259= synonymous_variant 8/351 NM_001848.3 ENSP00000355180 P1
COL6A1ENST00000492851.1 linkuse as main transcriptn.429G>A non_coding_transcript_exon_variant 2/23

Frequencies

GnomAD3 genomes
AF:
0.00447
AC:
680
AN:
152142
Hom.:
9
Cov.:
32
show subpopulations
Gnomad AFR
AF:
0.0160
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.000785
Gnomad ASJ
AF:
0.00
Gnomad EAS
AF:
0.00
Gnomad SAS
AF:
0.00
Gnomad FIN
AF:
0.00
Gnomad MID
AF:
0.00
Gnomad NFE
AF:
0.0000588
Gnomad OTH
AF:
0.000956
GnomAD3 exomes
AF:
0.00108
AC:
267
AN:
247982
Hom.:
0
AF XY:
0.000698
AC XY:
94
AN XY:
134692
show subpopulations
Gnomad AFR exome
AF:
0.0147
Gnomad AMR exome
AF:
0.000464
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.000327
Gnomad SAS exome
AF:
0.0000328
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000537
Gnomad OTH exome
AF:
0.000495
GnomAD4 exome
AF:
0.000494
AC:
720
AN:
1458908
Hom.:
8
Cov.:
34
AF XY:
0.000433
AC XY:
314
AN XY:
725710
show subpopulations
Gnomad4 AFR exome
AF:
0.0172
Gnomad4 AMR exome
AF:
0.000492
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.000202
Gnomad4 SAS exome
AF:
0.000104
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000261
Gnomad4 OTH exome
AF:
0.00109
GnomAD4 genome
AF:
0.00446
AC:
679
AN:
152258
Hom.:
9
Cov.:
32
AF XY:
0.00441
AC XY:
328
AN XY:
74452
show subpopulations
Gnomad4 AFR
AF:
0.0159
Gnomad4 AMR
AF:
0.000784
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.00
Gnomad4 SAS
AF:
0.00
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.0000588
Gnomad4 OTH
AF:
0.000946
Alfa
AF:
0.00223
Hom.:
1
Bravo
AF:
0.00510
Asia WGS
AF:
0.000289
AC:
1
AN:
3478
EpiCase
AF:
0.000109
EpiControl
AF:
0.0000593

ClinVar

Significance: Benign
Submissions summary: Benign:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

not provided Benign:2
Benign, criteria provided, single submitterclinical testingGeneDxNov 15, 2019This variant is associated with the following publications: (PMID: 26653219) -
Benign, criteria provided, single submitternot providedBreakthrough Genomics, Breakthrough Genomics-- -
not specified Benign:1
Benign, criteria provided, single submitterclinical testingPreventionGenetics, part of Exact Sciences-- -
Bethlem myopathy 1A Benign:1
Benign, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpJan 28, 2024- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
-0.64
CADD
Benign
4.3
DANN
Benign
0.68

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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs61735854; hg19: chr21-47407541; COSMIC: COSV100720511; API