IFT122 p.Ser618=
c.1854C>T · rs146874343 · VCV707440
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 9 submitters
gnomAD v4.1
Rare
low-frequency (popmax 3.17%, afr)
Conditions
2
cranioectodermal dysplasia 1
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 -1.5 | GERP -3.8 |
| Overall | ||
| CADD | 5.067 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
3.17%
African / African-American · 2,368/74,812 alleles
Filtering AF
3.06%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 3.02%
Overall
0.188%
3,040/1,613,736 alleles · low-frequency
exomes 1,655/1,461,774 · genomes 1,385/151,962 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 3.17% | 32 |
| Remaining individualsnot grpmax-eligible | 0.325% | 308 |
| Admixed American | 0.26% | 385 |
| East Asian | 0.25% | 400 |
| Middle Eastern | 0.099% | 1,010 |
| South Asian | 0.056% | 1,785 |
| European (non-Finnish) | 0.0118% | 8,489 |
| Ashkenazi Jewishnot grpmax-eligible | 0.00676% | 14,803 |
| Finnishnot grpmax-eligible | 0.00469% | 21,321 |
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
- IFT122
- Protein
- p.Ser618=
- Coding
- c.1854C>T
- MANE Select
- NM_052989
- dbSNP
- rs146874343
- Type
- single nucleotide variant
- Location
- chr3:129488259 (GRCh38)
- Gene constraint
- LOEUF 0.811 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 82.91 · 5 PDB
- Residue 618
- an α-helix
Similar variants
- IFT122 p.Ser618Phe Uncertain significance ★ ⚠ same residue
- IFT122 c.1148-1G>C Pathogenic/Likely pathogenic ★★ same condition
- IFT122 c.272+1G>A Likely pathogenic ★★ same condition
- IFT122 c.273-257C>A Pathogenic/Likely pathogenic ★★ same condition
- IFT122 c.3265+1G>A Pathogenic/Likely pathogenic ★★ same condition
- IFT122 p.Arg1185Ter Pathogenic/Likely pathogenic ★★ same condition
- IFT122 p.Arg189Ter Pathogenic/Likely pathogenic ★★ same condition
- IFT122 p.Arg673Ter 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/ift122-p-ser618 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown