Is SDHD p.Pro28= (c.84T>C) pathogenic?

SDHD p.Pro28= (c.84T>C) is classified Likely benign in SDHD (ClinVar, Single submitter, 1 submitter; last evaluated 2019-03-30). Absent from gnomAD v4.1; Associated with Carney-Stratakis syndrome.

What condition is associated with SDHD p.Pro28= (c.84T>C)?

SDHD p.Pro28= (c.84T>C) is associated with Carney-Stratakis syndrome, pheochromocytoma, Cowden syndrome 3 (ClinVar).

How common is SDHD p.Pro28= (c.84T>C) in the general population?

SDHD p.Pro28= (c.84T>C) is absent from gnomAD v4.1 (gnomAD).

How is Carney-Stratakis syndrome inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

SDHD p.Pro28=

c.84T>C · rs2135267119 · VCV1156016

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Carney-Stratakis 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 0.89	GERP -4.3, phastCons 1
Overall
CADD	8.93	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: SDHD
Protein: p.Pro28=
Coding: c.84T>C
MANE Select: NM_003002
dbSNP: rs2135267119
Type: single nucleotide variant
Location: chr11:112087888 (GRCh38)
Gene constraint: LOEUF 0.581 · pLI 0.91 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 81.50 · 2 PDB

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

Disease context

Carney-Stratakis syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: pheochromocytoma Cowden syndrome 3

For Carney-Stratakis syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult

Similar variants

SDHD p.Pro28Arg Uncertain significance ★★ ⚠ same residue
SDHD p.Pro28His Uncertain significance ★★ ⚠ same residue
SDHD p.Pro28Ser Uncertain significance ★★ ⚠ same residue
SDHD p.Pro28Thr Uncertain significance ★★ ⚠ same residue
SDHD p.Pro28Ala Uncertain significance ★ ⚠ same residue
SDHD p.Pro28Leu Uncertain significance ★ ⚠ same residue
SDHD c.170-1G>T Pathogenic ★★ same condition
SDHD c.170-2A>G 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/sdhd-p-pro28 (accessed [today's date]).

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