Is IFT172 p.Ala82= (c.246C>G) pathogenic?

IFT172 p.Ala82= (c.246C>G) is classified Likely benign in IFT172 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-03). Very rare (popmax 0.00017%, nfe); Associated with short-rib thoracic dysplasia 10 with or without polydactyly.

How common is IFT172 p.Ala82= (c.246C>G) in the general population?

IFT172 p.Ala82= (c.246C>G) is very rare (popmax 0.00017%, nfe) (gnomAD).

IFT172 p.Ala82=

Q: What condition is associated with IFT172 p.Ala82= (c.246C>G)?

IFT172 p.Ala82= (c.246C>G) is associated with short-rib thoracic dysplasia 10 with or without polydactyly, retinitis pigmentosa 71 (ClinVar).

c.246C>G · rs766570474 · VCV1942507

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Conditions

short-rib thoracic dysplasia 10 with or without polydactyly

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 3.8	GERP 0.42, phastCons 1
Overall
CADD	9.139	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00017% European (non-Finnish) · 2/1,177,108 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,610,422 alleles · very rare exomes 2/1,458,700 · genomes 0/151,722 · joint denominator

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: IFT172
Protein: p.Ala82=
Coding: c.246C>G
MANE Select: NM_015662
dbSNP: rs766570474
Type: single nucleotide variant
Location: chr2:27485068 (GRCh38)
Gene constraint: LOEUF 0.745 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 83.98 · 1 PDB

Full IFT172 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

short-rib thoracic dysplasia 10 with or without polydactyly — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: retinitis pigmentosa 71

Similar variants

IFT172 p.Ala82Ser Uncertain significance ★ same residue
IFT172 c.1411+2T>C Likely pathogenic ★★ same condition
IFT172 c.1525-1G>A Pathogenic/Likely pathogenic ★★ same condition
IFT172 c.184-2A>C Likely pathogenic ★★ same condition
IFT172 c.2443-1G>C Likely pathogenic ★★ same condition
IFT172 c.2976-2A>T Likely pathogenic ★★ same condition
IFT172 c.3111+1G>T Likely pathogenic ★★ same condition
IFT172 c.3821+1G>A 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/ift172-p-ala82 (accessed [today's date]).

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