Is SDHD p.Ala123= (c.369T>G) pathogenic?

SDHD p.Ala123= (c.369T>G) is classified Likely benign in SDHD (ClinVar, Single submitter, 1 submitter; last evaluated 2022-04-19). No allele count reported in gnomAD v4.1 (AN 1,611,870); Associated with hereditary neoplastic syndrome.

What condition is associated with SDHD p.Ala123= (c.369T>G)?

SDHD p.Ala123= (c.369T>G) is associated with hereditary neoplastic syndrome (ClinVar).

How common is SDHD p.Ala123= (c.369T>G) in the general population?

SDHD p.Ala123= (c.369T>G) is no allele count reported in gnomAD v4.1 (AN 1,611,870) (gnomAD).

SDHD p.Ala123=

c.369T>G · rs747779190 · VCV1734053

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,611,870)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.667	pathogenic-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.14	GERP -1.6, phastCons 0.99
Overall
CADD	8.68	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,611,870). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: SDHD
Protein: p.Ala123=
Coding: c.369T>G
MANE Select: NM_003002
dbSNP: rs747779190
Type: single nucleotide variant
Location: chr11:112094859 (GRCh38)
Gene constraint: LOEUF 0.581 · pLI 0.91 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 81.50 · 2 PDB
Residue 123: an α-helix

Full SDHD 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

Similar variants

SDHD c.170-1G>T Pathogenic ★★ same condition
SDHD c.170-2A>G Pathogenic/Likely pathogenic ★★ same condition
SDHD c.314+1G>A Pathogenic ★★ same condition
SDHD c.314+1G>T Pathogenic ★★ same condition
SDHD c.315-1G>A Likely pathogenic ★★ same condition
SDHD c.315-2A>C Pathogenic/Likely pathogenic ★★ same condition
SDHD p.Arg22Ter Pathogenic ★★ same condition
SDHD p.Arg38Ter 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/sdhd-p-ala123 (accessed [today's date]).

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