Is FADD p.Ser128= (c.384C>T) pathogenic?

FADD p.Ser128= (c.384C>T) is classified Likely benign in FADD (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-31). Very rare (popmax 0.00267%, afr); Associated with FADD-related immunodeficiency.

What condition is associated with FADD p.Ser128= (c.384C>T)?

FADD p.Ser128= (c.384C>T) is associated with FADD-related immunodeficiency (ClinVar).

How common is FADD p.Ser128= (c.384C>T) in the general population?

FADD p.Ser128= (c.384C>T) is very rare (popmax 0.00267%, afr) (gnomAD).

How is FADD-related immunodeficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

FADD p.Ser128=

c.384C>T · rs369418021 · VCV2895628

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Conditions

FADD-related immunodeficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -0.11	GERP -2.1
Overall
CADD	2.754	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00267% African / African-American · 2/74,920 alleles

Filtering AF 0.000443% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000166%

Overall 0.000496% 8/1,614,016 alleles · very rare exomes 7/1,461,844 · genomes 1/152,172 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00267%	37,460
European (non-Finnish)	0.000508%	196,669

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: FADD
Protein: p.Ser128=
Coding: c.384C>T
MANE Select: NM_003824
dbSNP: rs369418021
Type: single nucleotide variant
Location: chr11:70206230 (GRCh38)
Gene constraint: LOEUF 1.715 · pLI 0.07 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 72.60 · 18 PDB
Residue 128: the death domain; an α-helix

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

Disease context

FADD-related immunodeficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For FADD-related immunodeficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

FADD p.Ser128Gly Uncertain significance ★ ⚠ same residue
FADD p.Ala156Thr Uncertain significance ★★ same condition
FADD p.Asp106Asn Uncertain significance ★★ ⚠ same condition
FADD p.Ile126Met Uncertain significance ★★ ⚠ same condition
FADD p.Met193Thr Uncertain significance ★★ ⚠ same condition
FADD p.Ser18Arg Uncertain significance ★★ ⚠ same condition
FADD p.Thr151Ile Uncertain significance ★★ ⚠ same condition
FADD p.Val103Ile 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/fadd-p-ser128 (accessed [today's date]).

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