Is PALB2 p.Ile676= (c.2028T>C) pathogenic?

PALB2 p.Ile676= (c.2028T>C) is classified Benign/Likely benign in PALB2 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-10-25). Very rare (popmax 8.47e-05%, nfe); Associated with hereditary neoplastic syndrome.

What condition is associated with PALB2 p.Ile676= (c.2028T>C)?

PALB2 p.Ile676= (c.2028T>C) is associated with hereditary neoplastic syndrome, hereditary breast carcinoma (ClinVar).

How common is PALB2 p.Ile676= (c.2028T>C) in the general population?

PALB2 p.Ile676= (c.2028T>C) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

PALB2 p.Ile676=

c.2028T>C · rs763937788 · VCV820552

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.034	GERP -0.76
Overall
CADD	0.661	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,026 alleles

Overall 6.2e-05% 1/1,614,164 alleles · very rare exomes 1/1,461,872 · genomes 0/152,292 · joint denominator

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: PALB2
Protein: p.Ile676=
Coding: c.2028T>C
MANE Select: NM_024675
dbSNP: rs763937788
Type: single nucleotide variant
Location: chr16:23630126 (GRCh38)
Gene constraint: LOEUF 0.9 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 54.07 · 4 PDB
Residue 676: a UniProt-annotated variant site (risk factor for brovca5); a UniProt-annotated variant site (in fancn; risk factor for brovca5)

Full PALB2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Also linked: hereditary breast carcinoma

Similar variants

PALB2 p.Ile676Thr Benign ★★★ same residue
PALB2 p.Ile676Met Uncertain significance ★★ ⚠ same residue
PALB2 p.Ile676Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
PALB2 p.Ile676fs Pathogenic ★ same residue
PALB2 c.3350+4A>G Likely pathogenic ★★★ same condition
PALB2 p.Arg1117Lys Pathogenic ★★★ ⚠ same condition
PALB2 p.Gln228Ter Pathogenic ★★★ same condition
PALB2 p.Gln692Ter Likely 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/palb2-p-ile676 (accessed [today's date]).

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