Is IFT80 p.Thr447= (c.1341C>T) pathogenic?

IFT80 p.Thr447= (c.1341C>T) is classified Likely benign in IFT80 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-09-12). Ultra-rare (popmax 0.0165%, mid); Associated with Jeune syndrome.

What condition is associated with IFT80 p.Thr447= (c.1341C>T)?

IFT80 p.Thr447= (c.1341C>T) is associated with Jeune syndrome (ClinVar).

How common is IFT80 p.Thr447= (c.1341C>T) in the general population?

IFT80 p.Thr447= (c.1341C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

IFT80 p.Thr447=

c.1341C>T · rs779074288 · VCV701236

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

Jeune syndrome

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>T here scores Δ0.20 · evaluated, not missing
Constraint at this position
Conservation	phyloP 1.9	GERP -1, phastCons 1
Overall
CADD	11.48	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,064 alleles

Filtering AF 0.00679% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00524%

Overall 0.00162% 26/1,609,138 alleles · ultra-rare exomes 25/1,457,820 · genomes 1/151,318 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,064
South Asian	0.0121%	8,243
Remaining individualsnot grpmax-eligible	0.00643%	15,561
Ashkenazi Jewishnot grpmax-eligible	0.00339%	29,490
Admixed American	0.00334%	29,899
European (non-Finnish)	0.000595%	168,146

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: IFT80
Protein: p.Thr447=
Coding: c.1341C>T
MANE Select: NM_020800
dbSNP: rs779074288
Type: single nucleotide variant
Location: chr3:160285843 (GRCh38)
Gene constraint: LOEUF 0.739 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.50

Full IFT80 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Similar variants

IFT80 p.Thr447Ala Uncertain significance ★★ ⚠ same residue
IFT80 p.Arg495Ter Pathogenic/Likely pathogenic ★★ same condition
IFT80 p.Trp155Ter Pathogenic/Likely pathogenic ★★ same condition
IFT80 c.1076+6C>A Uncertain significance ★★ same condition
IFT80 c.1836+5T>C Uncertain significance ★★ same condition
IFT80 c.370+6T>C Uncertain significance ★★ same condition
IFT80 p.Ala154Val Uncertain significance ★★ ⚠ same condition
IFT80 p.Ala236Val 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/ift80-p-thr447 (accessed [today's date]).

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