Is PLCB4 p.Asp642Asn (c.1924G>A) pathogenic?

PLCB4 p.Asp642Asn (c.1924G>A) is classified Pathogenic/Likely pathogenic in PLCB4 (ClinVar, Multiple submitters, 8 submitters; last evaluated 2025-09-26). AlphaMissense: likely pathogenic (0.9211); Absent from gnomAD v4.1; Associated with auriculocondylar syndrome 2.

What condition is associated with PLCB4 p.Asp642Asn (c.1924G>A)?

PLCB4 p.Asp642Asn (c.1924G>A) is associated with auriculocondylar syndrome 2 (ClinVar).

How common is PLCB4 p.Asp642Asn (c.1924G>A) in the general population?

PLCB4 p.Asp642Asn (c.1924G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PLCB4 p.Asp642Asn (c.1924G>A)?

AlphaMissense predicts likely pathogenic (score 0.9211) — an in-silico prediction, not a clinical call.

PLCB4 p.Asp642Asn

c.1924G>A · rs1568763104 · VCV635078

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 8 submitters

AlphaMissense

likely pathogenic

0.9211 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

auriculocondylar syndrome 2

Computational evidence

Protein change
AlphaMissense	0.9211	likely pathogenic ✓ concordant with ClinVar
REVEL	0.439	indeterminate
SaProt	LLR -12.46	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.6, phastCons 1
Regional constraint	o/e 0.09	constrained · MANE · 91 bp · p 3.5e-09 · regional, not allelic
Overall
CADD	28.3	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 D630N vs ClinVar D642N) — verify the residue.

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: PLCB4
Protein: p.Asp642Asn
Coding: c.1924G>A
MANE Select: NM_001377142
dbSNP: rs1568763104
Type: single nucleotide variant
Location: chr20:9409106 (GRCh38)
Gene constraint: LOEUF 0.509 · pLI 0.97 (gnomAD)
Structure: AlphaFold pLDDT 86.03
Residue 630 UniProt numbering: the pi-plc y-box domain

Full PLCB4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

auriculocondylar syndrome 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PLCB4 p.Asp642Tyr Pathogenic ★ same residue
PLCB4 p.Asp642Val Likely pathogenic ★ same residue
PLCB4 p.Arg633Cys Pathogenic ★★ same condition
PLCB4 p.Arg633His Pathogenic ★★ same condition
PLCB4 c.1323+8T>C Uncertain significance ★★ same condition
PLCB4 c.*586C>T Uncertain significance ★★ same condition
PLCB4 p.Met965Thr Uncertain significance ★★ ⚠ same condition
PLCB4 c.1065-8A>G Benign ★★ 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/plcb4-p-asp642asn (accessed [today's date]).

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