MAP1B p.Ala618=
c.1854C>T · VCV3341707
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.01%, amr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -8.4 | GERP -4.5 |
| Overall | ||
| CADD | 3.864 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.01%
Admixed American · 6/59,944 alleles
Filtering AF
0.00429%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00345%
Overall
0.00409%
66/1,613,536 alleles · ultra-rare
exomes 60/1,461,792 · genomes 6/151,744 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Admixed Americangrpmax | 0.01% | 9,991 |
| European (non-Finnish) | 0.00483% | 20,702 |
| African / African-American | 0.00267% | 37,386 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,480 |
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
- MAP1B
- Protein
- p.Ala618=
- Coding
- c.1854C>T
- MANE Select
- NM_005909
- Type
- single nucleotide variant
- Location
- chr5:72195209 (GRCh38)
- Gene constraint
- LOEUF 0.105 · pLI 1.00 (gnomAD)
- Structure
- AlphaFold pLDDT 46.18
- Residue 618
- the 'disordered' region; a UniProt-annotated variant site (in pvnh9)
Similar variants
- MAP1B p.Ala618Asp Uncertain significance ★ ⚠ same residue
- MAP1B p.Arg1664Ter Pathogenic/Likely pathogenic ★★ same type
- MAP1B p.Arg2140Ter Pathogenic ★★ same type
- MAP1B p.Arg303Ter Pathogenic/Likely pathogenic ★★ same type
- MAP1B p.Arg85Ter Pathogenic/Likely pathogenic ★★ same type
- MAP1B p.Arg999Ter Pathogenic/Likely pathogenic ★★ same type
- MAP1B p.Ala966Val Uncertain significance ★★ ⚠ same type
- MAP1B p.Arg1399Cys 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/map1b-p-ala618 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown