SDC2

Chr 8

syndecan 2

Also known as: CD362, HSPG, HSPG1, SYND2

The encoded protein is a transmembrane heparan sulfate proteoglycan that functions as a cell surface receptor regulating dendritic arbor morphogenesis, cell proliferation, migration, and cell-matrix interactions. Mutations in SDC2 cause neurodevelopmental disorder with seizures and speech delay, inherited in an autosomal recessive pattern. The gene is moderately constrained against loss-of-function mutations.

OMIMResearchSummary from RefSeq, UniProt
DNmechanismLOEUF 0.67
Clinical SummarySDC2
Population Constraint (gnomAD)
Constrained for loss-of-function variants (OE-LoF 0.21) despite low pLI — interpret in context.
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Clinical Trials
2 active or recruiting trials — potential therapeutic options may be available

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

Tolerant — LoF & missense variants common in population
LoF Constraint
0.67LOEUF
pLI 0.405
Z-score 2.23
OE 0.21 (0.090.67)
Tolerant

Typical tolerance to LoF variation

Missense Constraint
0.46Z-score
OE missense 0.88 (0.741.04)
97 obs / 110.7 exp
Tolerant

Mild missense constraint

Observed / Expected Ratios
LoF OE0.21 (0.090.67)
00.351.4
Missense OE0.88 (0.741.04)
00.61.4
Synonymous OE1.12
01.21.6
LoF obs/exp: 2 / 9.4Missense obs/exp: 97 / 110.7Syn Z: -0.62
DN
0.7230th %ile
GOF
0.4974th %ile
LOF
0.3647th %ile

The highest-scoring mechanism for this gene is dominant-negative.

DNprediction above median

Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.

Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.

ClinVar Variant Classifications

0 submitted variants in ClinVar

Protein Context — Lollipop Plot

SDC2 · protein map & ClinVar variants

Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.

3D Protein StructureAlphaFold
Clinical Literature
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