Is AP1M2 p.Arg148Trp (c.442C>T) pathogenic?

AP1M2 p.Arg148Trp (c.442C>T) is classified Uncertain significance in AP1M2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-01-17). AlphaMissense: likely benign (0.2999); Very rare (popmax 0.00669%, eas).

How common is AP1M2 p.Arg148Trp (c.442C>T) in the general population?

AP1M2 p.Arg148Trp (c.442C>T) is very rare (popmax 0.00669%, eas) (gnomAD).

What do computational predictors say about AP1M2 p.Arg148Trp (c.442C>T)?

AlphaMissense predicts likely benign (score 0.2999) — an in-silico prediction, not a clinical call.

AP1M2 p.Arg148Trp

c.442C>T · rs542063701 · VCV3127470

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2999 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00669%, eas)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.2999	likely benign
REVEL	0.298	indeterminate
SaProt	LLR -12.44	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.7	GERP 1.7, phastCons 1
Regional constraint	o/e 0.90	unconstrained · MANE · 14 kb · p 0.022 · regional, not allelic
Overall
CADD	31.0	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 0.00669% East Asian · 3/44,868 alleles

Filtering AF 0.00177% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000891%

Overall 0.00137% 20/1,461,576 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00669%	14,956
Remaining individualsnot grpmax-eligible	0.0032%	31,245
European (non-Finnish)	0.00119%	84,275
South Asian	0.0011%	91,050

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: AP1M2
Protein: p.Arg148Trp
Coding: c.442C>T
MANE Select: NM_005498
dbSNP: rs542063701
Type: single nucleotide variant
Location: chr19:10581591 (GRCh38)
Gene constraint: LOEUF 1.073 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.03

Full AP1M2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

AP1M2 p.Arg148Gln Uncertain significance ★ ⚠ same residue
AP1M2 p.Ala156Gly Uncertain significance ★ ⚠ same type
AP1M2 p.Ala156Thr Uncertain significance ★ ⚠ same type
AP1M2 p.Ala3Val Uncertain significance ★ ⚠ same type
AP1M2 p.Ala405Thr Uncertain significance ★ ⚠ same type
AP1M2 p.Arg104Gln Uncertain significance ★ ⚠ same type
AP1M2 p.Arg19Cys Uncertain significance ★ ⚠ same type
AP1M2 p.Arg211Trp 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/ap1m2-p-arg148trp (accessed [today's date]).

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