Is NPHP1 p.Ile632fs (c.1893dup) pathogenic?

NPHP1 p.Ile632fs (c.1893dup) is classified Likely pathogenic in NPHP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-11). Associated with nephronophthisis 1.

What condition is associated with NPHP1 p.Ile632fs (c.1893dup)?

NPHP1 p.Ile632fs (c.1893dup) is associated with nephronophthisis 1, Senior-Loken syndrome 1, Joubert syndrome with renal defect (ClinVar).

NPHP1 p.Ile632fs

c.1893dup · VCV3584231

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Rare

Conditions

nephronophthisis 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	escapes	premature termination codon in the last exon (20 of 20) — the truncated protein is likely expressed. PVS1 input, not an applied code
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 3.3	GERP 1.9, phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Variant & gene context

Gene: NPHP1
Protein: p.Ile632fs
Coding: c.1893dup
MANE Select: NM_001128178
Type: Duplication
Location: chr2:110123931 (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 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Senior-Loken syndrome 1 Joubert syndrome with renal defect

Similar variants

NPHP1 p.Ile632Thr Uncertain significance ★★ ⚠ same residue
NPHP1 p.Leu340fs Pathogenic/Likely pathogenic ★★ same condition
NPHP1 p.Pro186fs Pathogenic ★★ same condition
NPHP1 p.Thr461fs Pathogenic/Likely pathogenic ★★ same condition
NPHP1 c.1717-1dup Likely pathogenic ★ same condition
NPHP1 c.771+37_771+38dup Likely pathogenic ★ same condition
NPHP1 p.Arg204fs Pathogenic ★ same condition
NPHP1 p.Gly161fs 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-ile632fs (accessed [today's date]).

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