Is NPHP4 p.Val883Met (c.2647G>A) pathogenic?

NPHP4 p.Val883Met (c.2647G>A) is classified Uncertain significance in NPHP4 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2024-10-23). AlphaMissense: likely benign (0.1213); Ultra-rare (popmax 0.016%, afr); Associated with nephronophthisis.

What condition is associated with NPHP4 p.Val883Met (c.2647G>A)?

NPHP4 p.Val883Met (c.2647G>A) is associated with nephronophthisis, nephronophthisis 4, Senior-Loken syndrome 4 (ClinVar).

How common is NPHP4 p.Val883Met (c.2647G>A) in the general population?

NPHP4 p.Val883Met (c.2647G>A) is ultra-rare (popmax 0.016%, afr) (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.Val883Met (c.2647G>A)?

AlphaMissense predicts likely benign (score 0.1213) — an in-silico prediction, not a clinical call.

NPHP4 p.Val883Met

c.2647G>A · rs769851221 · VCV291099

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.1213 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.016%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

nephronophthisis

Computational evidence

Protein change
AlphaMissense	0.1213	likely benign
REVEL	0.561	indeterminate
SaProt	LLR -7.34	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.081	GERP -0.67, phastCons 0.004
Regional constraint	o/e 1.02	unconstrained · MANE · 123 kb · p 0.49 · regional, not allelic
Overall
CADD	10.44	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 0.016% African / African-American · 12/74,828 alleles

Filtering AF 0.00922% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00722%

Overall 0.00492% 79/1,604,854 alleles · ultra-rare exomes 71/1,452,610 · genomes 8/152,244 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.016%	6,236
European (non-Finnish)	0.0052%	19,234
Admixed American	0.00503%	19,891
South Asian	0.00221%	45,181
Remaining individualsnot grpmax-eligible	0.00161%	61,998

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.Val883Met
Coding: c.2647G>A
MANE Select: NM_015102
dbSNP: rs769851221
Type: single nucleotide variant
Location: chr1:5877263 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.44
Residue 883: the 'sufficient for basal bodies localization' region; a UniProt-annotated variant site (found in a patient with cardiac laterality defects; uncertain significance)

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

Also linked: nephronophthisis 4 Senior-Loken syndrome 4

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-val883met (accessed [today's date]).

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