EXTL3 p.Arg158=
c.474A>T · rs749842890 · VCV1595098
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.0493%, mid)
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 -0.38 | GERP -2.7 |
| Overall | ||
| CADD | 0.398 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0493%
Middle Eastern · 3/6,084 alleles
Filtering AF
0.0188%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0151%
Overall
0.00161%
26/1,613,924 alleles · ultra-rare
exomes 23/1,461,798 · genomes 3/152,126 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0493% | 2,028 |
| East Asian | 0.0312% | 3,206 |
| Remaining individualsnot grpmax-eligible | 0.008% | 12,498 |
| Admixed American | 0.00167% | 59,988 |
| South Asian | 0.0011% | 91,084 |
| European (non-Finnish) | 0.000169% | 590,009 |
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
- EXTL3
- Protein
- p.Arg158=
- Coding
- c.474A>T
- MANE Select
- NM_001440
- dbSNP
- rs749842890
- Type
- single nucleotide variant
- Location
- chr8:28716533 (GRCh38)
- Gene constraint
- LOEUF 0.511 · pLI 0.93 (gnomAD)
- Structure
- AlphaFold pLDDT 84.22 · 4 PDB
- Residue 158
- an α-helix
Similar variants
- EXTL3 p.Arg158Ter Likely pathogenic ★ same residue
- EXTL3 p.Arg158Gln Likely benign ★ same residue
- EXTL3 p.Pro318Leu Pathogenic/Likely pathogenic ★★ ⚠ same type
- EXTL3 p.Ala373Thr Uncertain significance ★★ ⚠ same type
- EXTL3 p.Ala385Val Uncertain significance ★★ ⚠ same type
- EXTL3 p.Ala481Val Uncertain significance ★★ ⚠ same type
- EXTL3 p.Ala482Thr Uncertain significance ★★ ⚠ same type
- EXTL3 p.Ala507Ser Uncertain significance ★★ ⚠ same type
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/extl3-p-arg158 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown