Is HDAC8 p.Ser276= (c.828C>T) pathogenic?

HDAC8 p.Ser276= (c.828C>T) is classified Likely benign in HDAC8 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-12-31). Very rare (popmax 8.32e-05%); Associated with Cornelia de Lange syndrome 5.

What condition is associated with HDAC8 p.Ser276= (c.828C>T)?

HDAC8 p.Ser276= (c.828C>T) is associated with Cornelia de Lange syndrome 5 (ClinVar).

How common is HDAC8 p.Ser276= (c.828C>T) in the general population?

HDAC8 p.Ser276= (c.828C>T) is very rare (popmax 8.32e-05%) (gnomAD).

HDAC8 p.Ser276=

c.828C>T · rs2520416341 · VCV2825487

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 8.32e-05%)

Conditions

Cornelia de Lange syndrome 5

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 2.6	GERP 1.9, phastCons 1
Overall
CADD	9.634	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.32e-05%

Overall 8.32e-05% 1/1,202,316 alleles · very rare exomes 1/1,088,718 · genomes 0/113,598 · 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: HDAC8
Protein: p.Ser276=
Coding: c.828C>T
MANE Select: NM_018486
dbSNP: rs2520416341
Type: single nucleotide variant
Location: chrX:72464641 (GRCh38)
Structure: AlphaFold pLDDT 95.45 · 53 PDB
Residue 276: the 'histone deacetylase' region

Full HDAC8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Cornelia de Lange syndrome 5 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

HDAC8 c.165-2A>G Pathogenic ★★ same condition
HDAC8 c.738-1G>A Pathogenic ★★ same condition
HDAC8 c.738-2A>G Pathogenic/Likely pathogenic ★★ same condition
HDAC8 p.Arg164Ter Pathogenic ★★ same condition
HDAC8 p.Arg313Ter Pathogenic ★★ same condition
HDAC8 p.Arg37Gln Pathogenic/Likely pathogenic ★★ same condition
HDAC8 p.Asn156Ser Pathogenic ★★ same condition
HDAC8 p.Gln263Ter 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/hdac8-p-ser276 (accessed [today's date]).

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