Is NPHP1 p.Pro203= (c.609C>T) pathogenic?

NPHP1 p.Pro203= (c.609C>T) is classified Likely benign in NPHP1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-30). No allele count reported in gnomAD v4.1 (AN 1,610,742); Associated with nephronophthisis.

What condition is associated with NPHP1 p.Pro203= (c.609C>T)?

NPHP1 p.Pro203= (c.609C>T) is associated with nephronophthisis (ClinVar).

How common is NPHP1 p.Pro203= (c.609C>T) in the general population?

NPHP1 p.Pro203= (c.609C>T) is no allele count reported in gnomAD v4.1 (AN 1,610,742) (gnomAD).

How is Nephronophthisis inherited?

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

NPHP1 p.Pro203=

c.609C>T · VCV4706847

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,610,742)

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 3.2	GERP 1.3, phastCons 1
Overall
CADD	10.86	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,610,742). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: NPHP1
Protein: p.Pro203=
Coding: c.609C>T
MANE Select: NM_001128178
Type: single nucleotide variant
Location: chr2:110168467 (GRCh38)
Gene constraint: LOEUF 0.92 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.22 · 2 PDB
Residue 203: the sh3 domain; a β-strand

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.Pro203Arg 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
NPHP1 c.329+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP1 c.522+1G>A 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-pro203 (accessed [today's date]).

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