Is MAP1B p.Ala661Ser (c.1981G>T) pathogenic?

MAP1B p.Ala661Ser (c.1981G>T) is classified Likely benign in MAP1B (ClinVar, Single submitter, 1 submitter; last evaluated 2024-01-16). AlphaMissense: likely benign (0.0864); Ultra-rare (popmax 0.0502%, afr); Associated with Inborn genetic diseases.

What condition is associated with MAP1B p.Ala661Ser (c.1981G>T)?

MAP1B p.Ala661Ser (c.1981G>T) is associated with Inborn genetic diseases (ClinVar).

How common is MAP1B p.Ala661Ser (c.1981G>T) in the general population?

MAP1B p.Ala661Ser (c.1981G>T) is ultra-rare (popmax 0.0502%, afr) (gnomAD).

What do computational predictors say about MAP1B p.Ala661Ser (c.1981G>T)?

AlphaMissense predicts likely benign (score 0.0864) — an in-silico prediction, not a clinical call.

MAP1B p.Ala661Ser

c.1981G>T · rs200534593 · VCV3122698

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0864 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0502%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0864	likely benign
REVEL	0.087	moderately benign-leaning
SaProt	LLR -6.45	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.9	GERP 2.3, phastCons 1
Regional constraint	o/e 0.91	unconstrained · MANE · 5,330 bp · p 1.3e-05 · regional, not allelic
Overall
CADD	16.3	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0502% African / African-American · 37/73,758 alleles

Filtering AF 0.0374% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.033%

Overall 0.0025% 40/1,601,686 alleles · ultra-rare exomes 20/1,450,250 · genomes 20/151,436 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0502%	1,993
Remaining individualsnot grpmax-eligible	0.00484%	20,681

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.Ala661Ser
Coding: c.1981G>T
MANE Select: NM_005909
dbSNP: rs200534593
Type: single nucleotide variant
Location: chr5:72195336 (GRCh38)
Gene constraint: LOEUF 0.105 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 46.18
Residue 661: the 'disordered' region; a UniProt-annotated variant site (in pvnh9)

Full MAP1B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

MAP1B p.Ala966Val Uncertain significance ★★ ⚠ same condition
MAP1B p.Asp1480Tyr Uncertain significance ★★ ⚠ same condition
MAP1B p.Asp1993Gly Uncertain significance ★★ ⚠ same condition
MAP1B p.Glu1944Lys Uncertain significance ★★ ⚠ same condition
MAP1B p.Glu2435Val Uncertain significance ★★ ⚠ same condition
MAP1B p.Gly919Arg Uncertain significance ★★ ⚠ same condition
MAP1B p.Gly932Ser Uncertain significance ★★ ⚠ same condition
MAP1B p.Lys1025Arg 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/map1b-p-ala661ser (accessed [today's date]).

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