Is NPHP4 p.Arg807= (c.2421C>T) pathogenic?

NPHP4 p.Arg807= (c.2421C>T) is classified Likely benign in NPHP4 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-15). Very rare (popmax 0.005%, amr); Associated with nephronophthisis.

What condition is associated with NPHP4 p.Arg807= (c.2421C>T)?

NPHP4 p.Arg807= (c.2421C>T) is associated with nephronophthisis (ClinVar).

How common is NPHP4 p.Arg807= (c.2421C>T) in the general population?

NPHP4 p.Arg807= (c.2421C>T) is very rare (popmax 0.005%, amr) (gnomAD).

How is Nephronophthisis inherited?

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

NPHP4 p.Arg807=

c.2421C>T · rs746889951 · VCV700496

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

Conditions

nephronophthisis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>C here scores Δ0.20 · evaluated, not missing
Constraint at this position
Conservation	phyloP -5.9	GERP -3.9
Overall
CADD	0.618	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.005% Admixed American · 3/59,998 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000668%

Overall 0.00093% 15/1,613,422 alleles · very rare exomes 12/1,461,228 · genomes 3/152,194 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	19,999
African / African-American	0.00133%	74,932
South Asian	0.0011%	91,084
European (non-Finnish)	0.000848%	117,987

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: NPHP4
Protein: p.Arg807=
Coding: c.2421C>T
MANE Select: NM_015102
dbSNP: rs746889951
Type: single nucleotide variant
Location: chr1:5887350 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.44

Full NPHP4 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

NPHP4 p.Arg807Cys Uncertain significance ★★ ⚠ same residue
NPHP4 p.Arg807His Uncertain significance ★ ⚠ same residue
NPHP4 p.Arg807Ser Uncertain significance ★ ⚠ same residue
NPHP4 c.2304+1G>A Pathogenic ★★ same condition
NPHP4 c.2611+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP4 c.2611+1G>C Pathogenic ★★ same condition
NPHP4 c.3644+1G>A Pathogenic/Likely pathogenic ★★ same condition
NPHP4 c.3644+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/nphp4-p-arg807 (accessed [today's date]).

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