Is NPHP4 p.Cys1174Phe (c.3521G>T) pathogenic?

NPHP4 p.Cys1174Phe (c.3521G>T) is classified Uncertain significance in NPHP4 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-23). AlphaMissense: likely pathogenic (0.8285); Very rare (popmax 8.48e-05%, nfe); Associated with nephronophthisis.

What condition is associated with NPHP4 p.Cys1174Phe (c.3521G>T)?

NPHP4 p.Cys1174Phe (c.3521G>T) is associated with nephronophthisis (ClinVar).

How common is NPHP4 p.Cys1174Phe (c.3521G>T) in the general population?

NPHP4 p.Cys1174Phe (c.3521G>T) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

How is Nephronophthisis inherited?

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

What do computational predictors say about NPHP4 p.Cys1174Phe (c.3521G>T)?

AlphaMissense predicts likely pathogenic (score 0.8285) — an in-silico prediction, not a clinical call.

NPHP4 p.Cys1174Phe

c.3521G>T · rs1641309754 · VCV2088497

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.8285 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

nephronophthisis

Computational evidence

Protein change
AlphaMissense	0.8285	likely pathogenic · top 10% in NPHP4
REVEL	0.758	pathogenic-leaning
SaProt	LLR -11.63	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.5	GERP 2.1, phastCons 1
Regional constraint	o/e 1.02	unconstrained · MANE · 123 kb · p 0.49 · regional, not allelic
Overall
CADD	24.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,618 alleles

Overall 6.2e-05% 1/1,613,214 alleles · very rare exomes 1/1,460,936 · genomes 0/152,278 · 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: NPHP4
Protein: p.Cys1174Phe
Coding: c.3521G>T
MANE Select: NM_015102
dbSNP: rs1641309754
Type: single nucleotide variant
Location: chr1:5867067 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.44
Residue 1174: the 'sufficient for basal bodies localization' region

Full NPHP4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

nephronophthisis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Nephronophthisis (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Antenatal, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 100 000 (Finland)

Similar variants

NPHP4 p.Cys1174Tyr Uncertain significance ★ ⚠ same residue
NPHP4 c.2304+1G>A Pathogenic ★★ same condition
NPHP4 c.2611+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP4 c.2611+1G>C Pathogenic ★★ same condition
NPHP4 c.3644+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP4 c.3644+1G>T Pathogenic/Likely pathogenic ★★ same condition
NPHP4 c.518-2A>G Likely pathogenic ★★ same condition
NPHP4 c.992+2T>C 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/nphp4-p-cys1174phe (accessed [today's date]).

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