Is PHKB p.Ser238= (c.714G>T) pathogenic?

PHKB p.Ser238= (c.714G>T) is classified Likely benign in PHKB (ClinVar, Single submitter, 1 submitter; last evaluated 2024-06-23). Very rare (popmax 0.00224%, eas); Associated with glycogen storage disease IXb.

What condition is associated with PHKB p.Ser238= (c.714G>T)?

PHKB p.Ser238= (c.714G>T) is associated with glycogen storage disease IXb (ClinVar).

How common is PHKB p.Ser238= (c.714G>T) in the general population?

PHKB p.Ser238= (c.714G>T) is very rare (popmax 0.00224%, eas) (gnomAD).

PHKB p.Ser238=

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.714G>T · rs772326970 · VCV1572892

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00224%, eas)

Conditions

glycogen storage disease IXb

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>A here scores Δ0.21 · evaluated, not missing
Constraint at this position
Conservation	phyloP -0.39	GERP -3.8, phastCons 0.065
Overall
CADD	4.515	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00224% East Asian · 1/44,700 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.00031% 5/1,611,534 alleles · very rare exomes 5/1,459,556 · genomes 0/151,978 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00224%	44,700
African / African-American	0.00133%	74,938
European (non-Finnish)	0.000255%	392,697

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.Ser238=
Coding: c.714G>T
MANE Select: NM_000293
dbSNP: rs772326970
Type: single nucleotide variant
Location: chr16:47580298 (GRCh38)
Gene constraint: LOEUF 0.792 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 87.06 · 6 PDB
Residue 238: an α-helix

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.Ser238Ter Pathogenic ★ same residue
PHKB p.Ser238Leu 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

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-ser238 (accessed [today's date]).

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