Is PHKB p.Gln191fs (c.570_576delinsAC) pathogenic?

PHKB p.Gln191fs (c.570576delinsAC) is classified Pathogenic/Likely pathogenic in PHKB (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-04-02). No gnomAD frequency available for this variant; Associated with glycogen storage disease IXb.

What condition is associated with PHKB p.Gln191fs (c.570_576delinsAC)?

PHKB p.Gln191fs (c.570_576delinsAC) is associated with glycogen storage disease IXb (ClinVar).

How common is PHKB p.Gln191fs (c.570_576delinsAC) in the general population?

PHKB p.Gln191fs (c.570_576delinsAC) is no gnomAD frequency available for this variant (gnomAD).

PHKB p.Gln191fs

Q: How is Glycogen storage disease due to liver and muscle phosphorylase kinase deficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.570_576delinsAC · rs2151651792 · VCV1186084

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

glycogen storage disease IXb

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 6 of 31
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -1.7	GERP -2.8

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: PHKB
Protein: p.Gln191fs
Coding: c.570_576delinsAC
MANE Select: NM_000293
dbSNP: rs2151651792
Type: Indel
Location: chr16:47515577 (GRCh38)
Gene constraint: LOEUF 0.792 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 87.06 · 6 PDB

Full PHKB gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

glycogen storage disease IXb — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Glycogen storage disease due to liver and muscle phosphorylase kinase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

PHKB p.Gln191Glu Uncertain significance ★ ⚠ same residue
PHKB p.Val591_Leu594delinsAspArgTer Likely pathogenic ★ same condition
PHKB p.Pro1058Thr Uncertain significance ★ same condition
PHKB c.1127-2A>G Pathogenic/Likely pathogenic ★★ same condition
PHKB c.1364-2A>G Pathogenic ★★ same condition
PHKB c.1972-2A>G Pathogenic/Likely pathogenic ★★ same condition
PHKB c.2427+965A>C Pathogenic/Likely pathogenic ★★ same condition
PHKB c.2896-1G>T Pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/phkb-p-gln191fs (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown