Is NBN p.Ser397= (c.1191A>G) pathogenic?

NBN p.Ser397= (c.1191A>G) is classified Conflicting classifications of pathogenicity in NBN (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2023-01-16). Very rare (popmax 0.0011%, sas); Associated with hereditary neoplastic syndrome.

What condition is associated with NBN p.Ser397= (c.1191A>G)?

NBN p.Ser397= (c.1191A>G) is associated with hereditary neoplastic syndrome, Nijmegen breakage syndrome (ClinVar).

How common is NBN p.Ser397= (c.1191A>G) in the general population?

NBN p.Ser397= (c.1191A>G) is very rare (popmax 0.0011%, sas) (gnomAD).

NBN p.Ser397=

c.1191A>G · rs2129721280 · VCV1121649

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

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 0.01	GERP -3.5, phastCons 0.96
Overall
CADD	2.554	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/91,068 alleles

Overall 6.84e-05% 1/1,461,382 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: NBN
Protein: p.Ser397=
Coding: c.1191A>G
MANE Select: NM_057091 · reported on NM_002485
dbSNP: rs2129721280
Type: single nucleotide variant
Location: chr8:89955489 (GRCh38)
Structure: AlphaFold pLDDT 75.83 · 5 PDB

Full NBN 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: Nijmegen breakage syndrome

Similar variants

NBN p.Ser397Leu Uncertain significance ★★ ⚠ same residue
NBN p.Ser397Ter Pathogenic ★ same residue
NBN c.1124+1G>C Likely pathogenic ★★ same condition
NBN c.1124+2T>G Likely pathogenic ★★ same condition
NBN c.1397+2T>A Likely pathogenic ★★ same condition
NBN c.171+1G>A Likely pathogenic ★★ same condition
NBN c.172-1G>T Likely pathogenic ★★ same condition
NBN c.172-2A>G 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/nbn-p-ser397 (accessed [today's date]).

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