3-148997054-TTGTGTGTGTGTGTG-TTGTGTGTGTGTGTGTGTGTGTGTGTG

Variant names:

• chr3-148997054-T-TTGTGTGTGTGTG
• rs10571382
• NM_004130.4:c.481+168_481+179dupGTGTGTGTGTGT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_004130.4(GYG1):​c.481+168_481+179dupGTGTGTGTGTGT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000725 in 606,748 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000073 (0 hom., cov: 0)
  • Exomes 𝑓: 0.000072 (0 hom.)
• Consequence: GYG1 NM_004130.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.285
• Publications: 1 publications found

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]

GYG1 Gene-Disease associations (from GenCC):

• polyglucosan body myopathy type 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, PanelApp Australia, ClinGen
• glycogen storage disease XV

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004130.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GYG1	NM_004130.4	MANE Select	c.481+168_481+179dupGTGTGTGTGTGT		intron	N/A	NP_004121.2
	GYG1	NM_001184720.2		c.481+168_481+179dupGTGTGTGTGTGT		intron	N/A	NP_001171649.1
	GYG1	NM_001184721.2		c.481+168_481+179dupGTGTGTGTGTGT		intron	N/A	NP_001171650.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GYG1	ENST00000345003.9	TSL:1 MANE Select	c.481+150_481+151insTGTGTGTGTGTG		intron	N/A	ENSP00000340736.4
	GYG1	ENST00000296048.10	TSL:1	c.481+150_481+151insTGTGTGTGTGTG		intron	N/A	ENSP00000296048.6
	GYG1	ENST00000484197.5	TSL:1	c.481+150_481+151insTGTGTGTGTGTG		intron	N/A	ENSP00000420683.1

Frequencies

GnomAD3 genomes AF: 0.0000735 AC: 11 AN: 149704 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000148

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000666

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: 0.0000593

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000722 AC: 33 AN: 457044 Hom.: 0 AF XY: 0.0000697 AC XY: 17 AN XY: 243906

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000777 AC: 1 AN: 12862

American (AMR) AF: 0.00 AC: 0 AN: 24088

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14718

East Asian (EAS) AF: 0.00 AC: 0 AN: 28888

South Asian (SAS) AF: 0.0000400 AC: 2 AN: 50010

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 28848

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2106

European-Non Finnish (NFE) AF: 0.0000927 AC: 25 AN: 269598

Other (OTH) AF: 0.000193 AC: 5 AN: 25926

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00000000223896), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0000735 AC: 11 AN: 149704 Hom.: 0 Cov.: 0 AF XY: 0.0000822 AC XY: 6 AN XY: 72972

African (AFR) AF: 0.000148 AC: 6 AN: 40512

American (AMR) AF: 0.0000666 AC: 1 AN: 15026

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3452

East Asian (EAS) AF: 0.00 AC: 0 AN: 5130

South Asian (SAS) AF: 0.00 AC: 0 AN: 4720

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10182

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.0000593 AC: 4 AN: 67424

Other (OTH) AF: 0.00 AC: 0 AN: 2040

Alfa AF: 0.00 Hom.: 193

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.28

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs10571382; hg19: chr3-148714841;