Is NPHP4 p.Pro85= (c.255G>A) pathogenic?

NPHP4 p.Pro85= (c.255G>A) is classified Likely benign in NPHP4 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-05). Ultra-rare (popmax 0.0165%, mid); Associated with nephronophthisis.

What condition is associated with NPHP4 p.Pro85= (c.255G>A)?

NPHP4 p.Pro85= (c.255G>A) is associated with nephronophthisis (ClinVar).

How common is NPHP4 p.Pro85= (c.255G>A) in the general population?

NPHP4 p.Pro85= (c.255G>A) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

How is Nephronophthisis inherited?

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

NPHP4 p.Pro85=

c.255G>A · rs753738829 · VCV1094972

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

nephronophthisis

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 0.48	GERP -3.1, phastCons 1
Overall
CADD	7.403	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,050 alleles

Filtering AF 0.00289% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00197%

Overall 0.000684% 11/1,608,010 alleles · ultra-rare exomes 11/1,455,820 · genomes 0/152,190 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,050
South Asian	0.00666%	15,006
East Asian	0.00448%	22,340
Admixed American	0.00169%	59,182
Remaining individualsnot grpmax-eligible	0.00161%	62,282

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.Pro85=
Coding: c.255G>A
MANE Select: NM_015102
dbSNP: rs753738829
Type: single nucleotide variant
Location: chr1:5978294 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.44

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.Pro85Leu 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-pro85 (accessed [today's date]).

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