Is DDHD2 p.Ile356Arg (c.1067T>G) pathogenic?

DDHD2 p.Ile356Arg (c.1067T>G) is classified Uncertain significance in DDHD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-03-01). AlphaMissense: likely pathogenic (0.9985); Absent from gnomAD v4.1; Associated with hereditary spastic paraplegia 54.

What condition is associated with DDHD2 p.Ile356Arg (c.1067T>G)?

DDHD2 p.Ile356Arg (c.1067T>G) is associated with hereditary spastic paraplegia 54 (ClinVar).

How common is DDHD2 p.Ile356Arg (c.1067T>G) in the general population?

DDHD2 p.Ile356Arg (c.1067T>G) is absent from gnomAD v4.1 (gnomAD).

How is Autosomal recessive spastic paraplegia type 54 inherited?

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

What do computational predictors say about DDHD2 p.Ile356Arg (c.1067T>G)?

AlphaMissense predicts likely pathogenic (score 0.9985) — an in-silico prediction, not a clinical call.

DDHD2 p.Ile356Arg

c.1067T>G · rs1320383562 · VCV849149

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9985 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary spastic paraplegia 54

Computational evidence

Protein change
AlphaMissense	0.9985	likely pathogenic · top 4% in DDHD2
REVEL	0.682	pathogenic-leaning
SaProt	LLR -17.21	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 1.8, phastCons 1
Regional constraint	o/e 0.91	unconstrained · MANE · 21 kb · p 0.01 · regional, not allelic
Overall
CADD	28.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

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: DDHD2
Protein: p.Ile356Arg
Coding: c.1067T>G
MANE Select: NM_015214
dbSNP: rs1320383562
Type: single nucleotide variant
Location: chr8:38246242 (GRCh38)
Gene constraint: LOEUF 0.758 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.70
Residue 356: a UniProt-annotated variant site (in spg54; likely pathogenic; loss of triacylglycerol hydrolase activity)

Full DDHD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary spastic paraplegia 54 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal recessive spastic paraplegia type 54 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy

Similar variants

DDHD2 p.Ile356Thr Uncertain significance ★ ⚠ same residue
DDHD2 c.1126-2A>G Likely pathogenic ★★ same condition
DDHD2 c.1248+2T>C Likely pathogenic ★★ same condition
DDHD2 p.Arg232Ter Pathogenic ★★ same condition
DDHD2 p.Arg329Ter Pathogenic ★★ same condition
DDHD2 p.Arg516Ter Pathogenic ★★ same condition
DDHD2 p.Asp660His Pathogenic/Likely pathogenic ★★ same condition
DDHD2 p.Gln286Ter 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/ddhd2-p-ile356arg (accessed [today's date]).

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