Is DDHD2 p.Gln7= (c.21A>G) pathogenic?

DDHD2 p.Gln7= (c.21A>G) is classified Benign/Likely benign in DDHD2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-12-03). Rare (popmax 0.263%, eas); Associated with hereditary spastic paraplegia 54.

What condition is associated with DDHD2 p.Gln7= (c.21A>G)?

DDHD2 p.Gln7= (c.21A>G) is associated with hereditary spastic paraplegia 54 (ClinVar).

How common is DDHD2 p.Gln7= (c.21A>G) in the general population?

DDHD2 p.Gln7= (c.21A>G) is rare (popmax 0.263%, 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.

DDHD2 p.Gln7=

c.21A>G · rs182341575 · VCV696256

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

rare (popmax 0.263%, eas)

Conditions

hereditary spastic paraplegia 54

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 -2.2	GERP -2.9
Overall
CADD	7.951	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.263% East Asian · 118/44,878 alleles

Filtering AF 0.224% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.21%

Overall 0.0107% 173/1,614,178 alleles · rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.263%	380
South Asian	0.0428%	2,335
Remaining individualsnot grpmax-eligible	0.0208%	4,808
Admixed American	0.00333%	30,010
European (non-Finnish)	8.47e-05%	1,180,034

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.Gln7=
Coding: c.21A>G
MANE Select: NM_015214
dbSNP: rs182341575
Type: single nucleotide variant
Location: chr8:38233015 (GRCh38)
Gene constraint: LOEUF 0.758 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.70
Residue 7: the 'disordered' region

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 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
DDHD2 p.Trp115Ter 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-gln7 (accessed [today's date]).

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