Is PHKB p.Pro577= (c.1731G>A) pathogenic?

PHKB p.Pro577= (c.1731G>A) is classified Likely benign in PHKB (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-30). Very rare (popmax 0.0033%, sas); Associated with glycogen storage disease IXb.

What condition is associated with PHKB p.Pro577= (c.1731G>A)?

PHKB p.Pro577= (c.1731G>A) is associated with glycogen storage disease IXb (ClinVar).

How common is PHKB p.Pro577= (c.1731G>A) in the general population?

PHKB p.Pro577= (c.1731G>A) is very rare (popmax 0.0033%, sas) (gnomAD).

PHKB p.Pro577=

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.1731G>A · rs201607512 · VCV2146362

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.0033%, sas)

Conditions

glycogen storage disease IXb

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.5	GERP -5.5
Overall
CADD	7.762	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0033% South Asian · 3/90,996 alleles

Filtering AF 0.000876% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000652%

Overall 0.00137% 22/1,609,992 alleles · very rare exomes 18/1,457,822 · genomes 4/152,170 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0033%	30,332
East Asian	0.00223%	44,810
Remaining individualsnot grpmax-eligible	0.0016%	62,362
European (non-Finnish)	0.00136%	73,523
African / African-American	0.00133%	74,932

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: PHKB
Protein: p.Pro577=
Coding: c.1731G>A
MANE Select: NM_000293
dbSNP: rs201607512
Type: single nucleotide variant
Location: chr16:47649138 (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.Pro577Leu Uncertain significance ★★ ⚠ same residue
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
PHKB c.306-2A>G Pathogenic/Likely pathogenic ★★ same condition
PHKB p.Arg103Ter Pathogenic/Likely 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-pro577 (accessed [today's date]).

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