Is NPHP1 p.Ser551Asn (c.1652G>A) pathogenic?

NPHP1 p.Ser551Asn (c.1652G>A) is classified Uncertain significance in NPHP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-12-13). AlphaMissense: likely benign (0.2343); Ultra-rare (popmax 0.0165%, mid); Associated with nephronophthisis.

What condition is associated with NPHP1 p.Ser551Asn (c.1652G>A)?

NPHP1 p.Ser551Asn (c.1652G>A) is associated with nephronophthisis (ClinVar).

How common is NPHP1 p.Ser551Asn (c.1652G>A) in the general population?

NPHP1 p.Ser551Asn (c.1652G>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.

What do computational predictors say about NPHP1 p.Ser551Asn (c.1652G>A)?

AlphaMissense predicts likely benign (score 0.2343) — an in-silico prediction, not a clinical call.

NPHP1 p.Ser551Asn

c.1652G>A · rs2467155325 · VCV2041293

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2343 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

nephronophthisis

Computational evidence

Protein change
AlphaMissense	0.2343	likely benign
REVEL	0.119	moderately benign-leaning
SaProt	LLR -4.79	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.8	GERP 2, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 81 kb · p 0.26 · regional, not allelic
Overall
CADD	25.3	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM S606N vs ClinVar S551N) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Overall 0.000124% 2/1,612,666 alleles · ultra-rare exomes 2/1,460,392 · genomes 0/152,274 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
European (non-Finnish)	8.48e-05%	1,178,855

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.Ser551Asn
Coding: c.1652G>A
MANE Select: NM_001128178
dbSNP: rs2467155325
Type: single nucleotide variant
Location: chr2:110129250 (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-ser551asn (accessed [today's date]).

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