Is CD40LG p.Ser184Trp (c.551C>G) pathogenic?

CD40LG p.Ser184Trp (c.551C>G) is classified Uncertain significance in CD40LG (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-02). AlphaMissense: likely benign (0.1767); Absent from gnomAD v4.1; Associated with hyper-IgM syndrome type 1.

What condition is associated with CD40LG p.Ser184Trp (c.551C>G)?

CD40LG p.Ser184Trp (c.551C>G) is associated with hyper-IgM syndrome type 1 (ClinVar).

How common is CD40LG p.Ser184Trp (c.551C>G) in the general population?

CD40LG p.Ser184Trp (c.551C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CD40LG p.Ser184Trp (c.551C>G)?

AlphaMissense predicts likely benign (score 0.1767) — an in-silico prediction, not a clinical call.

CD40LG p.Ser184Trp

c.551C>G · VCV4760213

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1767 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

hyper-IgM syndrome type 1

Computational evidence

Protein change
AlphaMissense	0.1767	likely benign
REVEL	0.323	indeterminate
SaProt	LLR -6.71	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.1	GERP -3.5
Regional constraint	o/e 0.69	unconstrained · MANE · 11 kb · p 1.5e-05 · regional, not allelic
Overall
CADD	18.62	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CD40LG
Protein: p.Ser184Trp
Coding: c.551C>G
MANE Select: NM_000074
Type: single nucleotide variant
Location: chrX:136659180 (GRCh38)
Structure: AlphaFold pLDDT 82.34 · 8 PDB
Residue 184: the thd domain; a disulfide bond

Full CD40LG gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hyper-IgM syndrome type 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CD40LG p.Ser184Leu Uncertain significance ★ ⚠ same residue
CD40LG p.Ser184Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
CD40LG p.Ser184= Likely benign ★ same residue
CD40LG c.346+5G>A Pathogenic/Likely pathogenic ★★ same condition
CD40LG c.347-2A>G Pathogenic ★★ same condition
CD40LG p.Arg11Ter Pathogenic ★★ same condition
CD40LG p.Cys218Ter Pathogenic ★★ same condition
CD40LG p.Gln160Ter Pathogenic ★★ 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/cd40lg-p-ser184trp (accessed [today's date]).

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