Is DSCAM p.Ser268Leu (c.803C>T) pathogenic?

DSCAM p.Ser268Leu (c.803C>T) is classified Uncertain significance in DSCAM (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-30). AlphaMissense: ambiguous (0.3598); Absent from gnomAD v4.1; Associated with Inborn genetic diseases.

What condition is associated with DSCAM p.Ser268Leu (c.803C>T)?

DSCAM p.Ser268Leu (c.803C>T) is associated with Inborn genetic diseases (ClinVar).

How common is DSCAM p.Ser268Leu (c.803C>T) in the general population?

DSCAM p.Ser268Leu (c.803C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about DSCAM p.Ser268Leu (c.803C>T)?

AlphaMissense predicts ambiguous (score 0.3598) — an in-silico prediction, not a clinical call.

DSCAM p.Ser268Leu

c.803C>T · rs2074658195 · VCV3085885

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3598 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.3598	ambiguous
REVEL	0.132	moderately benign-leaning
SaProt	LLR -7.01	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 8.5	GERP 1.9, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 508 kb · p 2.3e-05 · regional, not allelic
Overall
CADD	26.2	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

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: DSCAM
Protein: p.Ser268Leu
Coding: c.803C>T
MANE Select: NM_001389
dbSNP: rs2074658195
Type: single nucleotide variant
Location: chr21:40353596 (GRCh38)
Gene constraint: LOEUF 0.28 · pLI 1.00 · ClinGen HI 2/3 (gnomAD)
Structure: AlphaFold pLDDT 69.98 · 1 PDB
Residue 268: a disulfide bond; the ig-like c2-type 3 domain

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

DSCAM p.Ser682Arg Uncertain significance ★★ ⚠ same condition
DSCAM p.Gly1960Glu Likely benign ★★ same condition
DSCAM p.Val757Leu Likely benign ★★ same condition
DSCAM p.Arg1754Ter Pathogenic ★ same condition
DSCAM c.3850+4G>C Uncertain significance ★ same condition
DSCAM c.4889-4C>G Uncertain significance ★ same condition
DSCAM c.5185+2T>A Uncertain significance ★ same condition
DSCAM c.5185+2T>C 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/dscam-p-ser268leu (accessed [today's date]).

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