# NM_004415.4(DSP):c.1783C>T (p.Gln595Ter)

https://sugi.bio/variant/dsp-p-gln595ter

## Summary

**DSP p.Gln595Ter (c.1783C>T)** is classified **Pathogenic/Likely pathogenic** in DSP (ClinVar, Multiple submitters, 3 submitters; last evaluated 2023-03-27). Absent from gnomAD v4.1; Associated with Global developmental delay.

**At a glance:** Pathogenic/Likely pathogenic · review: Multiple submitters · rsID rs2533894086 · 3 submitters · 2 linked conditions · absent from gnomAD v4.1

## For patients & families {#patients}

This is a change in the DSP gene that is considered likely disease-causing, submitted by 3 submitters, and is linked to Global developmental delay.

*Reference information, not medical advice, and not a prediction for any individual. A genetic counselor or clinician can interpret what it means for you and your family.*

**Support & next steps:** [Find a genetic counselor (NSGC)](https://findageneticcounselor.nsgc.org/).

## Identity {#identity}

| Field | Value |
| --- | --- |
| Gene | [DSP](https://sugi.bio/atlas/gene/DSP/) |
| Protein change (HGVS p.) | p.Gln595Ter |
| Coding change (HGVS c.) | c.1783C>T |
| MANE Select transcript | [NM_004415](https://www.ncbi.nlm.nih.gov/nuccore/NM_004415) |
| dbSNP | [rs2533894086](https://www.ncbi.nlm.nih.gov/snp/rs2533894086/) |
| Variant type | single nucleotide variant |
| Location | chr6:7571464-7571464 (GRCh38) |
| ClinVar | [VCV977635](https://www.ncbi.nlm.nih.gov/clinvar/variation/977635/) |

**All HGVS expressions:** `LRG_423:g.34828C>T`, `LRG_423t1:c.1783C>T`, `NC_000006.11:g.7571697C>T`, `NC_000006.12:g.7571464C>T`, `NG_008803.1:g.34828C>T`, `NM_001008844.3:c.1783C>T`, `NM_001319034.2:c.1783C>T`, `NM_004415.4:c.1783C>T`

## Computational & population evidence {#evidence}

**Concordance:** 1 independent predictor **concordant** with the ClinVar classification.

- **Missense predictors (AlphaMissense/REVEL/SaProt) do not apply** to this variant type — they score amino-acid substitutions only. For non-missense variants the computational signal comes from conservation (below), not from a missing predictor score.
- Conservation: phyloP 7.612, GERP 1.87, phastCons 1 — highly conserved position (PP3-type support)
- Molecular consequence: **nonsense (stop-gain)** — a predicted loss-of-function variant. ClinGen curates **sufficient evidence for haploinsufficiency** in this gene (constraint LOEUF 0.443, pLI 0.99991), supporting a loss-of-function disease mechanism. *Descriptive; not an applied PVS1 code.*
- Nonsense-mediated decay: the premature termination codon is **in exon 14 of 24**, so the transcript is predicted to undergo NMD.
- CADD: **PHRED 38.0**. No single ClinGen-calibrated threshold exists and the expert panels that use CADD disagree — GUCY2D/AIPL1 require ≥ 20.0 for an untranslated-region variant, ABCA4 ≥ 28.1 for a synonymous or indel variant, the Pulmonary Hypertension panel imports Pejaver 2022's missense-calibrated numbers, and the Antibody Deficiencies panel declines CADD entirely for PIK3CD. CADD v1.7 also incorporates Zoonomia phyloP, so it partly re-expresses the conservation above. *Descriptive; no threshold applied.*
- SpliceAI: **not assessed** — no allele at this position is in our SpliceAI release, either because it lies outside the scored MANE transcript scope or because every allele is below Δ0.2. We cannot tell which, so this claims neither; absence is not evidence against a splicing effect.
- Population frequency: **absent from gnomAD v4.1** — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

*Computational predictors are not independent (ClinGen Variant Classification guidance): AlphaMissense (Cheng et al. 2023) carries the ACMG weight for missense and conservation (phyloP/GERP/phastCons) for non-missense; REVEL (Pejaver-2022 calibrated strength bands) and SaProt (Su et al. 2023, structure-aware, ClinVar-independent protein language model, raw LLR) are shown as orthogonal agreement signals, not additive. For frequency, the gnomAD v4.1 grpmax filtering allele frequency (FAF95) is ClinGen's designated BA1/BS1 input (gnomAD v4 guidance v3.0, June 2025); BA1/BS1 thresholds are disease-specific, not a blanket 5%. Predictions, not a clinical determination.*

## Gene constraint & dosage {#gene-context}

**DSP** population constraint: LOEUF 0.443, pLI 0.99991, missense-Z 2.6512; ClinGen dosage — haploinsufficiency 3, triplosensitivity 0 (0–3 scale). *Lower LOEUF and higher pLI indicate a gene that tolerates loss-of-function poorly; ClinGen dosage is the curated haploinsufficiency call.*

Curated gene–disease validity (ClinGen):

- **hypertrophic cardiomyopathy** — Disputed (AD)
- **arrhythmogenic cardiomyopathy with wooly hair and keratoderma** — Definitive (AD)

## Protein context {#protein}

Residue **595** lies in the 'globular 1' region; the 'interaction with mapre1' region; a UniProt-annotated variant site (in arvd8; uncertain significance); a UniProt-annotated variant site (in dcwhkta; uncertain significance); a UniProt-annotated variant site (in arvd8; likely pathogenic; results in an unstable protein that forms perinuclear aggregates); a UniProt-annotated variant site (in arvd8 and dcwhkta; uncertain significance); a UniProt-annotated variant site (in arvd8).

**4 experimental structure(s)** (PDB): [1LM5](https://www.rcsb.org/structure/1LM5), [1LM7](https://www.rcsb.org/structure/1LM7), [3R6N](https://www.rcsb.org/structure/3R6N), [5DZZ](https://www.rcsb.org/structure/5DZZ).

## What this gene does {#gene-function}

*Describes the biological roles of DSP (the gene this variant disrupts) — not effects measured for this specific variant. A damaging variant is expected to affect these functions and pathways; the degree depends on the variant.*

**How this variant is thought to act:** DSP's established molecular role includes RNA binding. p.Gln595Ter falls in the globular 1 region.


### Pathways affected {#pathways}

DSP participates in **6 Reactome pathways** (⚕ = disease pathway):

| Pathway (Reactome) | Evidence |
| --- | --- |
| [Apoptotic cleavage of cell adhesion  proteins](https://reactome.org/content/detail/R-HSA-351906) | curated |
| [Formation of the cornified envelope](https://reactome.org/content/detail/R-HSA-6809371) | curated |
| [Keratinization](https://reactome.org/content/detail/R-HSA-6805567) | curated |
| [Neutrophil degranulation](https://reactome.org/content/detail/R-HSA-6798695) | curated |
| [RND1 GTPase cycle](https://reactome.org/content/detail/R-HSA-9696273) | curated |
| [RND3 GTPase cycle](https://reactome.org/content/detail/R-HSA-9696264) | curated |

### Molecular function & processes (GO — experimentally supported) {#go}

**Molecular function:** RNA binding, protein kinase C binding, scaffold protein binding.

**Biological process:** peptide cross-linking, keratinocyte differentiation, bundle of His cell-Purkinje myocyte adhesion involved in cell communication, regulation of heart rate by cardiac conduction, epithelial cell-cell adhesion, regulation of ventricular cardiac muscle cell action potential.

## Clinical significance {#significance}

**Pathogenic/Likely pathogenic** — review status Multiple submitters *(criteria provided, multiple submitters, no conflicts)*, last evaluated 2023-03-27.

**Submitter consensus:** conflicting (2 Pathogenic, 1 Likely pathogenic).

**Submission history:** 3 submissions (2019–2023); classifications have differed over time.

### Submitter classifications {#submitters}

| Submitter | Classification | Review | Method | Date |
| --- | --- | --- | --- | --- |
| Cytogénomique, Hospices Civils de Lyon | Pathogenic | criteria provided, single submitter | clinical testing | 2019-11-01 |
| GeneDx | Likely pathogenic | criteria provided, single submitter | clinical testing | 2023-03-27 |
| Departamento de Patología, Instituto de Genética, Universidad Nacional de Colombia | Pathogenic | criteria provided, single submitter | clinical testing | 2021-07-16 |

## Associated conditions {#conditions}

[Global developmental delay](https://sugi.bio/atlas/disease/global-developmental-delay/), [arrhythmogenic right ventricular dysplasia 8](https://sugi.bio/atlas/disease/arrhythmogenic-right-ventricular-dysplasia-8/).

**Reported phenotype names (ClinVar):** Global developmental delay, Arrhythmogenic right ventricular dysplasia 8, not provided, Cognitive delay, none provided, Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy 8, ARRHYTHMOGENIC RIGHT VENTRICULAR DYSPLASIA, FAMILIAL, 8, ARRHYTHMOGENIC RIGHT VENTRICULAR CARDIOMYOPATHY 8.

## Similar variants {#similar}

Related DSP variant pages (same residue, condition, or type): [DSP c.1141-2A>T](/variant/dsp-c-1141-minus-2a-t), [DSP c.1266+2T>C](/variant/dsp-c-1266-plus-2t-c), [DSP c.1574+1G>A](/variant/dsp-c-1574-plus-1g-a), [DSP c.2130+1G>A](/variant/dsp-c-2130-plus-1g-a), [DSP c.2297+1G>A](/variant/dsp-c-2297-plus-1g-a), [DSP c.2298-1G>C](/variant/dsp-c-2298-minus-1g-c), [DSP c.2298-2A>C](/variant/dsp-c-2298-minus-2a-c), [DSP c.2437-1G>C](/variant/dsp-c-2437-minus-1g-c).

### Data sources & attribution {#sources}

ClinVar (NCBI — public domain, built 2026-10-11); gnomAD v4.1 (Broad Institute, built 2026-10-06); AlphaMissense (Cheng et al. 2023, © Google DeepMind — CC BY 4.0, built 2026-01-27); REVEL (Ioannidis et al. 2016 — ODbL, built 2026-07-13); SaProt (Su et al. 2023 — MIT, built 2026-07-14); SpliceAI (Illumina — free for non-commercial use, built 2026-10-13); CADD (Rentzsch et al. 2019, University of Washington — free for non-commercial use, built 2026-10-10); Conservation (phyloP/phastCons/GERP) (UCSC hg38 470-way mammal (Hiller Lab) + Ensembl Compara, built 2026-07-12); gnomAD Non-coding Constraint (Gnocchi) (Chen et al. 2024, Broad Institute — CC0, built 2026-10-11); gnomAD Regional Missense Constraint (Broad Institute — CC0, built 2026-10-13); Pangolin (Zeng & Li 2022 — CC BY 4.0, built 2026-10-11); Repeat regions (UCSC — RepeatMasker, TRF, segmental duplications, built 2026-10-11); ClinGen (ClinGen, built 2026-09-22); UniProt (CC BY 4.0); Reactome / GO (CC BY 4.0, built 2026-09-23); MaveDB (per-record license, built 2026-10-11); CIViC (CC0, built 2026-09-22); Orphanet (Orphanet, built 2026-06-12)

*Primary record: NCBI ClinVar (variation 977635). Classifications reflect these databases as of the page's build date and may change. Free reference use — not medical advice; consult the primary submitters and a clinician.*