Is NPHP1 p.Leu526Trp (c.1577T>G) pathogenic?

NPHP1 p.Leu526Trp (c.1577T>G) is classified Uncertain significance in NPHP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2020-10-03). AlphaMissense: ambiguous (0.4179); Very rare (popmax 8.48e-05%, nfe); Associated with nephronophthisis.

What condition is associated with NPHP1 p.Leu526Trp (c.1577T>G)?

NPHP1 p.Leu526Trp (c.1577T>G) is associated with nephronophthisis (ClinVar).

How common is NPHP1 p.Leu526Trp (c.1577T>G) in the general population?

NPHP1 p.Leu526Trp (c.1577T>G) 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 NPHP1 p.Leu526Trp (c.1577T>G)?

AlphaMissense predicts ambiguous (score 0.4179) — an in-silico prediction, not a clinical call.

NPHP1 p.Leu526Trp

c.1577T>G · rs1314119987 · VCV1006788

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4179 · ACMG-weighted

gnomAD v4.1

Rare

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

Conditions

nephronophthisis

Computational evidence

Protein change
AlphaMissense	0.4179	ambiguous
REVEL	0.58	indeterminate
SaProt	LLR -12.01	damaging
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · A>T here scores Δ1.00 · evaluated, not missing
Constraint at this position
Conservation	phyloP 11	GERP 1.8, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 81 kb · p 0.26 · regional, not allelic
Overall
CADD	26.5	PHRED · no single calibrated threshold — expert panels disagree

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM L581W vs ClinVar L526W) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,098 alleles

Overall 6.2e-05% 1/1,613,084 alleles · very rare exomes 1/1,460,748 · genomes 0/152,336 · 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: NPHP1
Protein: p.Leu526Trp
Coding: c.1577T>G
MANE Select: NM_001128178
dbSNP: rs1314119987
Type: single nucleotide variant
Location: chr2:110131744 (GRCh38)
Gene constraint: LOEUF 0.92 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.22 · 2 PDB

Full NPHP1 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

NPHP1 p.Leu526Phe Uncertain significance ★ ⚠ same residue
NPHP1 p.Leu526= Likely benign ★ same residue
NPHP1 p.Leu526del Uncertain significance ★ same residue
NPHP1 c.1270-1G>A Pathogenic ★★ same condition
NPHP1 c.1270-2A>G Pathogenic/Likely pathogenic ★★ same condition
NPHP1 c.143+1G>C Likely pathogenic ★★ same condition
NPHP1 c.144-1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP1 c.1716+1G>T Pathogenic/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/nphp1-p-leu526trp (accessed [today's date]).

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