Is DDHD2 p.Arg112Gln (c.335G>A) pathogenic?

DDHD2 p.Arg112Gln (c.335G>A) is classified Likely benign in DDHD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-01). AlphaMissense: likely pathogenic (0.7451); Ultra-rare (popmax 0.0826%, eas); Associated with hereditary spastic paraplegia 54.

What condition is associated with DDHD2 p.Arg112Gln (c.335G>A)?

DDHD2 p.Arg112Gln (c.335G>A) is associated with hereditary spastic paraplegia 54 (ClinVar).

How common is DDHD2 p.Arg112Gln (c.335G>A) in the general population?

DDHD2 p.Arg112Gln (c.335G>A) is ultra-rare (popmax 0.0826%, eas) (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.Arg112Gln (c.335G>A)?

AlphaMissense predicts likely pathogenic (score 0.7451) — an in-silico prediction, not a clinical call.

DDHD2 p.Arg112Gln

c.335G>A · rs781089161 · VCV540291

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.7451 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0826%, eas)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary spastic paraplegia 54

Computational evidence

Protein change
AlphaMissense	0.7451	likely pathogenic
REVEL	0.75	pathogenic-leaning
SaProt	LLR -14.06	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 12	GERP 2.3, phastCons 1
Regional constraint	o/e 0.91	unconstrained · MANE · 21 kb · p 0.01 · regional, not allelic
Overall
CADD	30.0	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0826% East Asian · 37/44,812 alleles

Filtering AF 0.0616% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0543%

Overall 0.00273% 44/1,613,146 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0826%	1,211
Remaining individualsnot grpmax-eligible	0.0016%	62,430
South Asian	0.0011%	90,868
European (non-Finnish)	0.000424%	235,978

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: DDHD2
Protein: p.Arg112Gln
Coding: c.335G>A
MANE Select: NM_015214
dbSNP: rs781089161
Type: single nucleotide variant
Location: chr8:38234508 (GRCh38)
Gene constraint: LOEUF 0.758 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.70
Residue 112: the wwe domain

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.Arg112Ter Pathogenic ★ same residue
DDHD2 p.Arg112Leu 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

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-arg112gln (accessed [today's date]).

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