Is MAPK8IP3 p.Ser306Arg (c.918C>G) pathogenic?

MAPK8IP3 p.Ser306Arg (c.918C>G) is classified Likely benign in MAPK8IP3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-05-14). AlphaMissense: likely benign (0.158); Ultra-rare (popmax 0.0133%, amr); Associated with Inborn genetic diseases.

What condition is associated with MAPK8IP3 p.Ser306Arg (c.918C>G)?

MAPK8IP3 p.Ser306Arg (c.918C>G) is associated with Inborn genetic diseases (ClinVar).

How common is MAPK8IP3 p.Ser306Arg (c.918C>G) in the general population?

MAPK8IP3 p.Ser306Arg (c.918C>G) is ultra-rare (popmax 0.0133%, amr) (gnomAD).

What do computational predictors say about MAPK8IP3 p.Ser306Arg (c.918C>G)?

AlphaMissense predicts likely benign (score 0.158) — an in-silico prediction, not a clinical call.

MAPK8IP3 p.Ser306Arg

c.918C>G · VCV4051636

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.158 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0133%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.158	likely benign
REVEL	0.027	moderately benign-leaning
SaProt	LLR -5.66	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 3.2	GERP 2.3, phastCons 1
Regional constraint	o/e 0.80	unconstrained · MANE · 35 kb · p 6.4e-05 · regional, not allelic
Overall
CADD	20.2	PHRED · no single calibrated threshold — expert panels disagree

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM S305R vs ClinVar S306R) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0133% Admixed American · 8/60,016 alleles

Filtering AF 0.00661% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00482%

Overall 0.000496% 8/1,613,754 alleles · ultra-rare

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: MAPK8IP3
Protein: p.Ser306Arg
Coding: c.918C>G
MANE Select: NM_001318852
Type: single nucleotide variant
Location: chr16:1747199 (GRCh38)
Gene constraint: LOEUF 0.407 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 63.19 · 5 PDB
Residue 306: a UniProt-annotated variant site (in nedba); the 'disordered' region

Full MAPK8IP3 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

MAPK8IP3 p.Arg579Cys Pathogenic/Likely pathogenic ★★ same condition
MAPK8IP3 c.1898+5G>A Uncertain significance ★★ same condition
MAPK8IP3 p.Ala883Thr Uncertain significance ★★ ⚠ same condition
MAPK8IP3 p.Arg1012Cys Uncertain significance ★★ ⚠ same condition
MAPK8IP3 p.Arg1187Gln Uncertain significance ★★ ⚠ same condition
MAPK8IP3 p.Arg308Cys Uncertain significance ★★ ⚠ same condition
MAPK8IP3 p.Arg310Trp Uncertain significance ★★ ⚠ same condition
MAPK8IP3 p.Arg612Cys 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/mapk8ip3-p-ser306arg (accessed [today's date]).

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