chr16-30748347-C-T

Variant names:

• chr16-30748347-C-T
• rs938838075
• ENST00000424889.7:c.-162C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000424889.7(PHKG2):​c.-162C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000179 in 167,294 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 35)
  • Exomes 𝑓: 0.000067 (0 hom.)
• Consequence: PHKG2 ENST00000424889.7 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.221
• Publications: 0 publications found

Genes affected

PHKG2 (HGNC:8931): (phosphorylase kinase catalytic subunit gamma 2) Phosphorylase kinase is a polymer of 16 subunits, four each of alpha, beta, gamma and delta. The alpha subunit includes the skeletal muscle and hepatic isoforms, encoded by two different genes. The beta subunit is the same in both the muscle and hepatic isoforms, and encoded by one gene. The gamma subunit also includes the skeletal muscle and hepatic isoforms, and the hepatic isoform is encoded by this gene. The delta subunit is a calmodulin and can be encoded by three different genes. The gamma subunits contain the active site of the enzyme, whereas the alpha and beta subunits have regulatory functions controlled by phosphorylation. The delta subunit mediates the dependence of the enzyme on calcium concentration. Mutations in this gene cause glycogen storage disease type 9C, also known as autosomal liver glycogenosis. Alternatively spliced transcript variants encoding different isoforms have been identified in this gene.[provided by RefSeq, Feb 2010]

PHKG2 Gene-Disease associations (from GenCC):

• glycogen storage disease IXc

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• glycogen storage disease due to liver phosphorylase kinase deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000260899 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000424889.7. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHKG2	NM_000294.3	MANE Select	c.-162C>T		upstream_gene	N/A	NP_000285.1	P15735-1
	PHKG2	NM_001172432.2		c.-162C>T		upstream_gene	N/A	NP_001165903.1	P15735-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHKG2	ENST00000424889.7	TSL:2	c.-162C>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 11	ENSP00000388571.3	P15735-2
	PHKG2	ENST00000565924.5	TSL:3	c.-90C>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 8	ENSP00000455091.1	H3BP07
	PHKG2	ENST00000424889.7	TSL:2	c.-162C>T		5_prime_UTR	Exon 1 of 11	ENSP00000388571.3	P15735-2

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152268 Hom.: 0 Cov.: 35

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000671 AC: 1 AN: 14906 Hom.: 0 Cov.: 0 AF XY: 0.000130 AC XY: 1 AN XY: 7688

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

African (AFR) AF: 0.00 AC: 0 AN: 110

American (AMR) AF: 0.00 AC: 0 AN: 1492

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 266

East Asian (EAS) AF: 0.00227 AC: 1 AN: 440

South Asian (SAS) AF: 0.00 AC: 0 AN: 2304

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 50

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 9108

Other (OTH) AF: 0.00 AC: 0 AN: 718

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152388 Hom.: 0 Cov.: 35 AF XY: 0.0000268 AC XY: 2 AN XY: 74522

African (AFR) AF: 0.00 AC: 0 AN: 41604

American (AMR) AF: 0.00 AC: 0 AN: 15310

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000386 AC: 2 AN: 5186

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68036

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Glycogen storage disease IXc (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
CADD	Benign	11
DANN	Benign	0.93
PhyloP100		0.22
PromoterAI		-0.012	Neutral

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: rs938838075; hg19: chr16-30759668;