Is MAP1B p.Pro1313Ser (c.3937C>T) pathogenic?

MAP1B p.Pro1313Ser (c.3937C>T) is classified Uncertain significance in MAP1B (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-28). AlphaMissense: ambiguous (0.4143); Very rare (popmax 0.00878%, sas); Associated with Inborn genetic diseases.

What condition is associated with MAP1B p.Pro1313Ser (c.3937C>T)?

MAP1B p.Pro1313Ser (c.3937C>T) is associated with Inborn genetic diseases (ClinVar).

How common is MAP1B p.Pro1313Ser (c.3937C>T) in the general population?

MAP1B p.Pro1313Ser (c.3937C>T) is very rare (popmax 0.00878%, sas) (gnomAD).

What do computational predictors say about MAP1B p.Pro1313Ser (c.3937C>T)?

AlphaMissense predicts ambiguous (score 0.4143) — an in-silico prediction, not a clinical call.

MAP1B p.Pro1313Ser

c.3937C>T · VCV4624236

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4143 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00878%, sas)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.4143	ambiguous
REVEL	0.288	benign-leaning
SaProt	LLR -6.84	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense is indeterminate.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 6	GERP 2.4, phastCons 1
Regional constraint	o/e 0.91	unconstrained · MANE · 5,330 bp · p 1.3e-05 · regional, not allelic
Overall
CADD	23.0	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 0.00878% South Asian · 8/91,084 alleles

Filtering AF 0.00437% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00312%

Overall 0.00155% 25/1,614,056 alleles · very rare exomes 22/1,461,870 · genomes 3/152,186 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00878%	11,386
Admixed American	0.00167%	59,998
Remaining individualsnot grpmax-eligible	0.0016%	62,480
African / African-American	0.00133%	74,922
European (non-Finnish)	0.00119%	84,289

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.Pro1313Ser
Coding: c.3937C>T
MANE Select: NM_005909
Type: single nucleotide variant
Location: chr5:72197292 (GRCh38)
Gene constraint: LOEUF 0.105 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 46.18
Residue 1313: a UniProt-annotated variant site (in pvnh9); a UniProt-annotated variant site (in pvnh9; no effect on protein expression); the 'disordered' region

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-pro1313ser (accessed [today's date]).

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