# NM_006579.3(EBP):c.149C>A (p.Ser50Ter)

https://sugi.bio/variant/ebp-p-ser50ter

## Summary

**EBP p.Ser50Ter (c.149C>A)** is classified **Pathogenic** in EBP (ClinVar, Single submitter, 2 submitters; last evaluated 2022-08-20). Absent from gnomAD v4.1.

**At a glance:** Pathogenic · review: Single submitter · rsID rs2519522184 · 2 submitters · absent from gnomAD v4.1

## For patients & families {#patients}

This is a change in the EBP gene that is reported as disease-causing, but on limited review, submitted by 2 submitters.

*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 | [EBP](https://sugi.bio/atlas/gene/EBP/) |
| Protein change (HGVS p.) | p.Ser50Ter |
| Coding change (HGVS c.) | c.149C>A |
| MANE Select transcript | [NM_001378122](https://www.ncbi.nlm.nih.gov/nuccore/NM_001378122) (variant reported on NM_006579) |
| dbSNP | [rs2519522184](https://www.ncbi.nlm.nih.gov/snp/rs2519522184/) |
| Variant type | single nucleotide variant |
| Location | chrX:48523920-48523920 (GRCh38) |
| ClinVar | [VCV2138562](https://www.ncbi.nlm.nih.gov/clinvar/variation/2138562/) |

**All HGVS expressions:** `NC_000023.10:g.48382308C>A`, `NC_000023.11:g.48523920C>A`, `NG_007452.1:g.7145C>A`, `NM_006579.3:c.149C>A`

## 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 and, for splice-region changes, SpliceAI (below), not from a missing predictor score.
- SpliceAI predicts **acceptor loss** (Δ 0.32) — consistent with the pathogenic call
- Conservation: phyloP 4.514, GERP 2.04, 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, supporting a loss-of-function disease mechanism. For a truncating variant the loss-of-function impact is position-dependent — C-terminal / last-exon truncations may escape nonsense-mediated decay. *Descriptive; not an applied PVS1 code.*
- CADD: **PHRED 35.0**. 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 deltas (raw): acceptor loss **0.32**, donor loss **0.00**, acceptor gain **0.09**, donor gain **0.00**. Largest is acceptor loss.
- SpliceAI deltas (masked): acceptor loss **0.32**, donor loss **0.00**, acceptor gain **0.09**, donor gain **0.00**.
- 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}

**EBP** population constraint: 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):

- **MEND syndrome** — Definitive (XL)

## Protein context {#protein}

Residue **50** lies in the 'disordered' region.

AlphaFold model confidence (whole protein): pLDDT 59.09, 10% of residues very-high.

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

*Describes the biological roles of EBP (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:** EBP's established molecular role includes proline-rich region binding. p.Ser50Ter falls in the disordered region.


### Pathways affected {#pathways}

EBP participates in **1 Reactome pathway** (⚕ = disease pathway):

| Pathway (Reactome) | Evidence |
| --- | --- |
| [Golgi Associated Vesicle Biogenesis](https://reactome.org/content/detail/R-HSA-432722) | curated |

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

**Molecular function:** proline-rich region binding.

**Biological process:** positive regulation of membrane protein ectodomain proteolysis.

## Clinical significance {#significance}

**Pathogenic** — review status Single submitter *(criteria provided, single submitter)*, last evaluated 2022-08-20.

**Submitter consensus:** unanimous (1/1 Pathogenic).

**Submission history:** 3 submissions (2022); classifications have differed over time.

### Submitter classifications {#submitters}

| Submitter | Classification | Review | Method | Date |
| --- | --- | --- | --- | --- |
| Labcorp Genetics (formerly Invitae), Labcorp | Pathogenic | criteria provided, single submitter | clinical testing | 2022-08-20 |
| Dr. Peter K. Rogan Lab, Western University |  | no classification provided | in vitro |  |

**Reported phenotype names (ClinVar):** not provided, Thyroid cancer, nonmedullary, 1, none provided.

## Similar variants {#similar}

Related EBP variant pages (same residue, condition, or type): [EBP p.Arg110Gln](/variant/ebp-p-arg110gln), [EBP p.Arg110Ter](/variant/ebp-p-arg110ter), [EBP p.Arg147Cys](/variant/ebp-p-arg147cys), [EBP p.Arg147His](/variant/ebp-p-arg147his), [EBP p.Arg62Trp](/variant/ebp-p-arg62trp), [EBP p.Glu80Lys](/variant/ebp-p-glu80lys), [EBP p.Gly161Arg](/variant/ebp-p-gly161arg), [EBP p.Ser98Phe](/variant/ebp-p-ser98phe).

### 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 2138562). 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.*