Is AFF2 p.Asn120Ser (c.359A>G) pathogenic?

AFF2 p.Asn120Ser (c.359A>G) is classified Uncertain significance in AFF2 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-05-08). AlphaMissense: likely benign (0.1019); Very rare (popmax 0.000448%, nfe).

How common is AFF2 p.Asn120Ser (c.359A>G) in the general population?

AFF2 p.Asn120Ser (c.359A>G) is very rare (popmax 0.000448%, nfe) (gnomAD).

What do computational predictors say about AFF2 p.Asn120Ser (c.359A>G)?

AlphaMissense predicts likely benign (score 0.1019) — an in-silico prediction, not a clinical call.

AFF2 p.Asn120Ser

c.359A>G · rs1557257822 · VCV1305523

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1019 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000448%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1019	likely benign
REVEL	0.082	moderately benign-leaning
SaProt	LLR -5.75	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 6.1	GERP -1.2, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 161 kb · p 0.93 · regional, not allelic
Overall
CADD	19.16	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

Grpmax group 0.000448% European (non-Finnish) · 4/893,510 alleles

Filtering AF 0.000105% ClinGen BA1/BS1 input FAF95, joint · FAF99 7.1e-05%

Overall 0.000365% 4/1,095,941 alleles · very 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: AFF2
Protein: p.Asn120Ser
Coding: c.359A>G
MANE Select: NM_002025
dbSNP: rs1557257822
Type: single nucleotide variant
Location: chrX:148662086 (GRCh38)
Structure: AlphaFold pLDDT 49.27
Residue 120: the 'disordered' region

Full AFF2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

AFF2 c.3267+5G>C Uncertain significance ★★ same type
AFF2 p.Ala1197Thr Uncertain significance ★★ ⚠ same type
AFF2 p.Ala171Pro Uncertain significance ★★ ⚠ same type
AFF2 p.Arg1238Cys Uncertain significance ★★ ⚠ same type
AFF2 p.Arg1295Cys Uncertain significance ★★ ⚠ same type
AFF2 p.Arg670His Uncertain significance ★★ ⚠ same type
AFF2 p.Asn77Ile Uncertain significance ★★ ⚠ same type
AFF2 p.Asp187Glu 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/aff2-p-asn120ser (accessed [today's date]).

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