Is FH p.Lys122= (c.366G>A) pathogenic?

FH p.Lys122= (c.366G>A) is classified Benign/Likely benign in FH (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-11-09). Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with FH p.Lys122= (c.366G>A)?

FH p.Lys122= (c.366G>A) is associated with hereditary neoplastic syndrome, hereditary leiomyomatosis and renal cell cancer (ClinVar).

How common is FH p.Lys122= (c.366G>A) in the general population?

FH p.Lys122= (c.366G>A) is absent from gnomAD v4.1 (gnomAD).

FH p.Lys122=

c.366G>A · rs1573886379 · VCV824051

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Absent

absent from gnomAD v4.1

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 1.8	GERP 0.93, phastCons 1
Overall
CADD	11.76	PHRED · no single calibrated threshold — expert panels disagree

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: FH
Protein: p.Lys122=
Coding: c.366G>A
MANE Select: NM_000143
dbSNP: rs1573886379
Type: single nucleotide variant
Location: chr1:241513615 (GRCh38)
Gene constraint: LOEUF 0.599 · pLI 0.27 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 92.92 · 8 PDB
Residue 122: a modified residue (n6-acetyllysine; alternate); a modified residue (n6-succinyllysine; alternate); an α-helix

Full FH 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 leiomyomatosis and renal cell cancer

Similar variants

FH c.1108+1G>A Pathogenic ★★ same condition
FH c.1108+1G>T Pathogenic/Likely pathogenic ★★ same condition
FH c.1236+1G>A Pathogenic/Likely pathogenic ★★ same condition
FH c.1236+1G>C Pathogenic ★★ same condition
FH c.1236+2T>G Pathogenic ★★ same condition
FH c.1237-1G>T Likely pathogenic ★★ same condition
FH c.1390+1G>T Pathogenic/Likely pathogenic ★★ same condition
FH c.1391-1G>A Pathogenic/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/fh-p-lys122 (accessed [today's date]).

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