Is CEP83 p.Arg41Ter (c.121C>T) pathogenic?

CEP83 p.Arg41Ter (c.121C>T) is classified Pathogenic in CEP83 (ClinVar, Single submitter, 2 submitters; last evaluated 2025-08-29). Very rare (popmax 0.0055%, sas); Associated with nephronophthisis 18.

What condition is associated with CEP83 p.Arg41Ter (c.121C>T)?

CEP83 p.Arg41Ter (c.121C>T) is associated with nephronophthisis 18 (ClinVar).

How common is CEP83 p.Arg41Ter (c.121C>T) in the general population?

CEP83 p.Arg41Ter (c.121C>T) is very rare (popmax 0.0055%, sas) (gnomAD).

How is Nephronophthisis inherited?

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

CEP83 p.Arg41Ter

c.121C>T · rs587777486 · VCV139540

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.0055%, sas)

Conditions

nephronophthisis 18

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 3 of 17
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.3	GERP -1.4, phastCons 1
Overall
CADD	35.0	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0055% South Asian · 5/90,928 alleles

Filtering AF 0.00211% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00137%

Overall 0.00105% 17/1,612,430 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0055%	18,186
Admixed American	0.00334%	29,922
Remaining individualsnot grpmax-eligible	0.0016%	62,402
African / African-American	0.00134%	74,810
European (non-Finnish)	0.000678%	147,391

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: CEP83
Protein: p.Arg41Ter
Coding: c.121C>T
MANE Select: NM_016122
dbSNP: rs587777486
Type: single nucleotide variant
Location: chr12:94412370 (GRCh38)
Gene constraint: LOEUF 0.807 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.90

Full CEP83 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

nephronophthisis 18 — 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

CEP83 p.Arg41Gln Uncertain significance ★ ⚠ same residue
CEP83 p.Arg209Ter Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Arg215Ter Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Arg511Pro Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Arg511Ter Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Gln81Ter Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Leu351Ter Pathogenic/Likely pathogenic ★★ same condition
CEP83 p.Ala232Val Uncertain significance ★★ ⚠ 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/cep83-p-arg41ter (accessed [today's date]).

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