Is AHI1 p.Ser663Pro (c.1987T>C) pathogenic?

AHI1 p.Ser663Pro (c.1987T>C) is classified Uncertain significance in AHI1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-11-01). AlphaMissense: likely pathogenic (0.9778); No allele count reported in gnomAD v4.1 (AN 1,569,110); Associated with Joubert syndrome.

What condition is associated with AHI1 p.Ser663Pro (c.1987T>C)?

AHI1 p.Ser663Pro (c.1987T>C) is associated with Joubert syndrome (ClinVar).

How common is AHI1 p.Ser663Pro (c.1987T>C) in the general population?

AHI1 p.Ser663Pro (c.1987T>C) is no allele count reported in gnomAD v4.1 (AN 1,569,110) (gnomAD).

What do computational predictors say about AHI1 p.Ser663Pro (c.1987T>C)?

AlphaMissense predicts likely pathogenic (score 0.9778) — an in-silico prediction, not a clinical call.

AHI1 p.Ser663Pro

c.1987T>C · rs2484675639 · VCV2092205

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9778 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,569,110)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Joubert syndrome

Computational evidence

Protein change
AlphaMissense	0.9778	likely pathogenic · top 4% in AHI1
REVEL	0.671	pathogenic-leaning
SaProt	LLR -13.88	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 9.2	GERP 2.2, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 202 kb · p 0.67 · regional, not allelic
Overall
CADD	28.0	PHRED · no single calibrated threshold — expert panels disagree

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

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

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,569,110). 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: AHI1
Protein: p.Ser663Pro
Coding: c.1987T>C
MANE Select: NM_001134831
dbSNP: rs2484675639
Type: single nucleotide variant
Location: chr6:135438424 (GRCh38)
Gene constraint: LOEUF 1.069 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 62.03 · 1 PDB
Residue 663: a UniProt-annotated variant site (in jbts3)

Full AHI1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Joubert syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

AHI1 p.Ser663= Likely benign ★ same residue
AHI1 c.1152-1G>A Pathogenic/Likely pathogenic ★★ same condition
AHI1 c.1152-2A>G Pathogenic ★★ same condition
AHI1 c.1626+1G>A Pathogenic/Likely pathogenic ★★ same condition
AHI1 c.1779+1G>T Pathogenic/Likely pathogenic ★★ same condition
AHI1 c.2492+1G>A Pathogenic/Likely pathogenic ★★ same condition
AHI1 c.2623+1G>A Pathogenic ★★ same condition
AHI1 c.2623+1G>T 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/ahi1-p-ser663pro (accessed [today's date]).

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