Is GPHN p.Asp24= (c.72T>C) pathogenic?

GPHN p.Asp24= (c.72T>C) is classified Likely benign in GPHN (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-06-24). Very rare (popmax 0.00183%, nfe); Associated with sulfite oxidase deficiency due to molybdenum cofactor deficiency type C.

What condition is associated with GPHN p.Asp24= (c.72T>C)?

GPHN p.Asp24= (c.72T>C) is associated with sulfite oxidase deficiency due to molybdenum cofactor deficiency type C (ClinVar).

How common is GPHN p.Asp24= (c.72T>C) in the general population?

GPHN p.Asp24= (c.72T>C) is very rare (popmax 0.00183%, nfe) (gnomAD).

GPHN p.Asp24=

c.72T>C · rs777651189 · VCV1641387

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00183%, nfe)

Conditions

sulfite oxidase deficiency due to molybdenum cofactor deficiency type C

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 2.2	GERP 1.9, phastCons 1
Overall
CADD	11.28	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00183% European (non-Finnish) · 21/1,144,448 alleles

Filtering AF 0.00118% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.001%

Overall 0.00134% 21/1,572,572 alleles · very rare exomes 20/1,420,460 · genomes 1/152,112 · joint denominator

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: GPHN
Protein: p.Asp24=
Coding: c.72T>C
MANE Select: NM_020806
dbSNP: rs777651189
Type: single nucleotide variant
Location: chr14:66681114 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 84.15 · 1 PDB
Residue 24: the 'mpt mo-transferase' region; an α-helix

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

Disease context

sulfite oxidase deficiency due to molybdenum cofactor deficiency type C — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PLEK2 p.Arg24Gly Uncertain significance ★ ⚠ same residue
RDH12 p.Lys24Asn Uncertain significance ★ ⚠ same residue
PIGH p.Pro24= Benign same residue
GPHN c.828+1G>A Likely pathogenic ★★ same condition
GPHN p.Tyr56Ter Pathogenic/Likely pathogenic ★★ same condition
GPHN c.1413+3A>G Uncertain significance ★★ same condition
GPHN p.Ala239Thr Uncertain significance ★★ ⚠ same condition
GPHN p.Ala448Ser Uncertain significance ★★ ⚠ 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/gphn-p-asp24 (accessed [today's date]).

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