Is NPHP4 p.Ser868Asn (c.2603G>A) pathogenic?

NPHP4 p.Ser868Asn (c.2603G>A) is classified Uncertain significance in NPHP4 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-08-05). AlphaMissense: likely benign (0.0886); Ultra-rare (popmax 0.0217%, amr); Associated with nephronophthisis 4.

What condition is associated with NPHP4 p.Ser868Asn (c.2603G>A)?

NPHP4 p.Ser868Asn (c.2603G>A) is associated with nephronophthisis 4, Senior-Loken syndrome 4, nephronophthisis (ClinVar).

How common is NPHP4 p.Ser868Asn (c.2603G>A) in the general population?

NPHP4 p.Ser868Asn (c.2603G>A) is ultra-rare (popmax 0.0217%, amr) (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.Ser868Asn (c.2603G>A)?

AlphaMissense predicts likely benign (score 0.0886) — an in-silico prediction, not a clinical call.

NPHP4 p.Ser868Asn

c.2603G>A · rs763576044 · VCV950067

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0886 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0217%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

nephronophthisis 4

Computational evidence

Protein change
AlphaMissense	0.0886	likely benign
REVEL	0.172	moderately benign-leaning
SaProt	LLR -9.26	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -0.3	GERP -3.4
Regional constraint	o/e 1.02	unconstrained · MANE · 123 kb · p 0.49 · regional, not allelic
Overall
CADD	2.092	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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 0.0217% Admixed American · 13/59,982 alleles

Filtering AF 0.0127% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0101%

Overall 0.00651% 105/1,613,616 alleles · ultra-rare exomes 88/1,461,402 · genomes 17/152,214 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0217%	4,614
European (non-Finnish)	0.00763%	13,109
Remaining individualsnot grpmax-eligible	0.0016%	62,462
African / African-American	0.00133%	74,920

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.Ser868Asn
Coding: c.2603G>A
MANE Select: NM_015102
dbSNP: rs763576044
Type: single nucleotide variant
Location: chr1:5880122 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.44
Residue 868: the 'sufficient for basal bodies localization' region

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

Disease context

nephronophthisis 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Senior-Loken syndrome 4 nephronophthisis

For Nephronophthisis (Orphanet):

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

Similar variants

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.517+1G>A 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-ser868asn (accessed [today's date]).

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