3-148991479-A-G

Position:

• chr3-148991479-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The ENST00000296048.10(GYG1):​c.-162A>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00169 in 870,080 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0063 (6 hom., cov: 33)
  • Exomes 𝑓: 0.00072 (5 hom.)
• Consequence: GYG1 ENST00000296048.10 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -1.62

Genes affected

GYG1 (HGNC:4699): (glycogenin 1) This gene encodes a member of the glycogenin family. Glycogenin is a glycosyltransferase that catalyzes the formation of a short glucose polymer from uridine diphosphate glucose in an autoglucosylation reaction. This reaction is followed by elongation and branching of the polymer, catalyzed by glycogen synthase and branching enzyme, to form glycogen. This gene is expressed in muscle and other tissues. Mutations in this gene result in glycogen storage disease XV. This gene has pseudogenes on chromosomes 1, 8 and 13 respectively. Alternatively spliced transcript variants encoding different isoforms have been identified.[provided by RefSeq, Sep 2010]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.72).
• BP6: Variant 3-148991479-A-G is Benign according to our data. Variant chr3-148991479-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 1189350.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00629 (958/152230) while in subpopulation AFR AF= 0.0218 (908/41564). AF 95% confidence interval is 0.0207. There are 6 homozygotes in gnomad4. There are 441 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 6 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GYG1	ENST00000296048.10	c.-162A>G		5_prime_UTR_variant	1/7	1		P1
GYG1	ENST00000627418.2	c.-162A>G		5_prime_UTR_variant	1/6	5
GYG1	ENST00000483267.5			upstream_gene_variant		2

Frequencies

GnomAD3 genomes AF: 0.00628 AC: 956 AN: 152122 Hom.: 6 Cov.: 33

Gnomad AFR AF: 0.0219

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00236

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00641

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00382

GnomAD4 exome AF: 0.000717 AC: 515 AN: 717850 Hom.: 5 Cov.: 9 AF XY: 0.000595 AC XY: 223 AN XY: 374550

Gnomad4 AFR exome AF: 0.0223

Gnomad4 AMR exome AF: 0.00245

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000485

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000810

Gnomad4 OTH exome AF: 0.00182

GnomAD4 genome AF: 0.00629 AC: 958 AN: 152230 Hom.: 6 Cov.: 33 AF XY: 0.00592 AC XY: 441 AN XY: 74444

Gnomad4 AFR AF: 0.0218

Gnomad4 AMR AF: 0.00235

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00378

Alfa AF: 0.00465 Hom.: 0

Bravo AF: 0.00719

Asia WGS AF: 0.00145 AC: 5 AN: 3466

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 19, 2019	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.72
CADD	Benign	9.6
DANN	Benign	0.65

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

LitVar

Other links and lift over

dbSNP: rs191178836; hg19: chr3-148709266;