Is NPHP1 p.Ser474= (c.1422C>T) pathogenic?

NPHP1 p.Ser474= (c.1422C>T) is classified Likely benign in NPHP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-11-01). Very rare (popmax 0.00448%, eas); Associated with nephronophthisis.

What condition is associated with NPHP1 p.Ser474= (c.1422C>T)?

NPHP1 p.Ser474= (c.1422C>T) is associated with nephronophthisis (ClinVar).

How common is NPHP1 p.Ser474= (c.1422C>T) in the general population?

NPHP1 p.Ser474= (c.1422C>T) is very rare (popmax 0.00448%, eas) (gnomAD).

How is Nephronophthisis inherited?

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

NPHP1 p.Ser474=

c.1422C>T · rs1160667484 · VCV1580081

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00448%, eas)

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 2.9	GERP -0.001, phastCons 1
Overall
CADD	8.425	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00448% East Asian · 2/44,682 alleles

Filtering AF 0.000742% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000278%

Overall 0.000125% 2/1,596,524 alleles · very rare exomes 2/1,444,414 · genomes 0/152,110 · 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.Ser474=
Coding: c.1422C>T
MANE Select: NM_001128178
dbSNP: rs1160667484
Type: single nucleotide variant
Location: chr2:110144500 (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 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
NPHP1 c.729-2A>G 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-ser474 (accessed [today's date]).

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