Is DDHD1 p.Gln508= (c.1524A>G) pathogenic?

DDHD1 p.Gln508= (c.1524A>G) is classified Benign/Likely benign in DDHD1 (ClinVar, Multiple submitters, 6 submitters; last evaluated 2026-01-27). Rare (popmax 0.219%, nfe); Associated with hereditary spastic paraplegia 28.

What condition is associated with DDHD1 p.Gln508= (c.1524A>G)?

DDHD1 p.Gln508= (c.1524A>G) is associated with hereditary spastic paraplegia 28, hereditary spastic paraplegia (ClinVar).

How common is DDHD1 p.Gln508= (c.1524A>G) in the general population?

DDHD1 p.Gln508= (c.1524A>G) is rare (popmax 0.219%, nfe) (gnomAD).

How is Autosomal recessive spastic paraplegia type 28 inherited?

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

DDHD1 p.Gln508=

c.1524A>G · rs138906273 · VCV380535

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 6 submitters

gnomAD v4.1

Rare

rare (popmax 0.219%, nfe)

Conditions

hereditary spastic paraplegia 28

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 4.1	GERP 0.43, phastCons 1
Overall
CADD	9.18	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.219% European (non-Finnish) · 2,579/1,179,922 alleles

Filtering AF 0.212% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.209%

Overall 0.182% 2,930/1,613,696 alleles · rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.219%	458
Ashkenazi Jewishnot grpmax-eligible	0.206%	485
Remaining individualsnot grpmax-eligible	0.173%	579
Middle Eastern	0.165%	606
Admixed American	0.12%	834
South Asian	0.0681%	1,469
Finnishnot grpmax-eligible	0.033%	3,034
African / African-American	0.0227%	4,415

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: DDHD1
Protein: p.Gln508=
Coding: c.1524A>G
MANE Select: NM_001160148
dbSNP: rs138906273
Type: single nucleotide variant
Location: chr14:53063185 (GRCh38)
Gene constraint: LOEUF 0.642 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 67.11

Full DDHD1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary spastic paraplegia 28 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary spastic paraplegia

For Autosomal recessive spastic paraplegia type 28 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Childhood, Infancy

Similar variants

DDHD1 p.Ala193Val Uncertain significance ★★ ⚠ same condition
DDHD1 p.Ala94Pro Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg204Trp Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg288His Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg554Gln Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg570Gln Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg588Gln Uncertain significance ★★ ⚠ same condition
DDHD1 p.Arg596Gln Uncertain significance ★★ ⚠ 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/ddhd1-p-gln508 (accessed [today's date]).

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