Dystrophic epidermolysis bullosa, nails only

disease

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Also known as DEB-nanails-only DDEBnails-only DEB

Summary

Dystrophic epidermolysis bullosa, nails only (MONDO:0015553) is a disease with 1 cohort gene.

At a glance

Prevalence: <1 / 1 000 000 (Worldwide) [Orphanet-validated]
Cohort genes: 1
Phenotypes (HPO): 11

Clinical features

Epidemiology

Prevalence records

2 prevalence record(s), Orphanet:

Type	Class	Value	Geography	Validation
Cases/families		10	Worldwide	Validated
Point prevalence	<1 / 1 000 000		Worldwide	Validated

Signs & symptoms

Clinical features (HPO)

11 HPO clinical features (Orphanet curated; top 11 by frequency):

HPO ID	Term	Frequency
HP:0001805	Onychogryposis	Very frequent (80-99%)
HP:0001808	Fragile nails	Very frequent (80-99%)
HP:0008404	Nail dystrophy	Very frequent (80-99%)
HP:0001810	Dystrophic toenail	Frequent (30-79%)
HP:0008391	Dystrophic fingernails	Frequent (30-79%)
HP:0008401	Onychogryposis of toenails	Frequent (30-79%)
HP:0040036	Onychogryposis of fingernail	Frequent (30-79%)
HP:0001802	Absent toenail	Occasional (5-29%)
HP:0001030	Fragile skin	Excluded (0%)
HP:0008066	Abnormal blistering of the skin	Excluded (0%)
HP:0011121	Abnormal skin morphology	Excluded (0%)

Identifiers

Disease identifiers

Field	Value
Canonical name	dystrophic epidermolysis bullosa, nails only
Mondo ID	MONDO:0015553
Orphanet	158676
SNOMED CT	722436002
UMLS	C4302547
MedGen	928216
GARD	0020032
Is cancer (heuristic)	no

Also known as: DEB-na · nails-only DDEB · nails-only DEB

Data availability: 1 GenCC gene-disease record.

Disease family

Classification path: disease › human disease › disease by body system or component › integumentary system disorder › skin disorder › vesiculobullous skin disease › epidermolysis bullosa › inherited epidermolysis bullosa › epidermolysis bullosa dystrophica › dystrophic epidermolysis bullosa, nails only

Genetics & variants

GWAS landscape

No GWAS associations recorded — common-variant (GWAS) studies don’t cover this disease (typical for Mendelian / rare diseases). See the curated gene cohort and Mendelian overlap below.

Variant details and genetic-evidence tiers

No tiered GWAS variants or ClinVar records for this disease.

Genes & proteins

Mendelian disease overlap and somatic drivers

GenCC: 26 · Orphanet: 9 · OMIM-shared: 0 · Dual-evidence (GWAS+Mendelian): 0

GenCC gene–disease validity (cohort genes)

the Disease column is the GenCC-asserted condition — a cohort gene’s strongest validity may be for a related predisposition syndrome.

Gene	Classification	Inheritance	Disease	Records
COL7A1	Definitive	Autosomal recessive	recessive dystrophic epidermolysis bullosa	26

Orphanet rare-disease linkage (cohort genes)

Gene	Orphanet ID	Rare disease
COL7A1	Orphanet:158673	Localized dystrophic epidermolysis bullosa, acral form
COL7A1	Orphanet:158676	Localized dystrophic epidermolysis bullosa, nails only
COL7A1	Orphanet:231568	Autosomal dominant generalized dystrophic epidermolysis bullosa
COL7A1	Orphanet:79408	Autosomal recessive generalized dystrophic epidermolysis bullosa, severe form
COL7A1	Orphanet:79409	Recessive dystrophic epidermolysis bullosa inversa
COL7A1	Orphanet:79410	Localized dystrophic epidermolysis bullosa, pretibial form
COL7A1	Orphanet:79411	Self-improving dystrophic epidermolysis bullosa
COL7A1	Orphanet:89842	Autosomal recessive generalized dystrophic epidermolysis bullosa, intermediate form
COL7A1	Orphanet:89843	Dystrophic epidermolysis bullosa pruriginosa

Cohort genes → proteins

1 cohort genes, 1 distinct canonical proteins.

Evidence partition

Subset	Genes
multi_evidence	1

Cohort genes (full)

Symbol	HGNC	Ensembl	UniProt	Name	Evidence
COL7A1	HGNC:2214	ENSG00000114270	Q02388	Collagen alpha-1(VII) chain	gencc

Cohort function summary

Lead sentence per gene, UniProt-curated.

Symbol	Protein name	Function (lead sentence)
COL7A1	Collagen alpha-1(VII) chain	Stratified squamous epithelial basement membrane protein that forms anchoring fibrils which may contribute to epithelial basement membrane organization and adherence by interacting with extracellular matrix (ECM) proteins such as type IV c…

Protein-family classification

Druggable: 1 · Difficult: 0 · Unknown: 0 · Druggable fraction: 1.0

Family distribution

Cohort families vs a genome-wide background (hypergeometric, BH-FDR; fold = observed/expected). Counts kept; sorted by enrichment, so the catch-all Other/Unknown bucket no longer leads.

Family	Genes	Fold	FDR
Antibody/Immunoglobulin	1	29.2×	0.034

Per-gene assignment

Symbol	Family	Druggable?	EC	InterPro (top 3)
COL7A1	Antibody/Immunoglobulin	yes		VWF_A, Kunitz_BPTI, FN3_dom

Expression context

Cohort genes with no expression data: 0.

1 cohort gene are a single-cell marker in ≥1 SCXA experiment.

Breadth distribution (Bgee present_calls)

Bucket	Genes
narrow (1-5 tissues)	0
moderate (6-20)	0
broad (>20)	1
unknown	0

Top tissues across cohort

Tissue	Cohort genes
skin of abdomen	1
skin of leg	1
stromal cell of endometrium	1

Per-gene tissue summary (top 30)

Symbol	Bgee breadth	FANTOM5 breadth	SCXA	Top tissues
COL7A1	267	ubiquitous	marker	stromal cell of endometrium, skin of abdomen, skin of leg

Protein interactions among cohort

Intra-cohort edges: 0.

Hub genes (top 10 by interactor count)

Symbol	Interactor count
COL7A1	1,767

Structural data

PDB: 0 · AlphaFold-only: 1 · No structure: 0

AlphaFold-only cohort genes (top 30 by pLDDT)

Symbol	UniProt	pLDDT
COL7A1	Q02388

Function

Pathway analysis

Distinct Reactome pathways touched by cohort: 10. Enrichment computed across 1 evidence-associated genes (1 with Reactome annotation).

Pathways by enrichment

Over-representation of cohort genes vs the genome-wide background (hypergeometric test, Benjamini-Hochberg FDR; fold = observed/expected over 1 annotated cohort genes). Counts and members are kept as ground-truth; sorted by enrichment.

Pathway	Cohort genes	Fold	FDR	Sample cohort genes
Anchoring fibril formation	1	761.3×	0.007	COL7A1
Fibronectin matrix formation	1	571.0×	0.007	COL7A1
Laminin interactions	1	380.7×	0.007	COL7A1
Cargo concentration in the ER	1	335.9×	0.007	COL7A1
Collagen chain trimerization	1	259.6×	0.007	COL7A1
Assembly of collagen fibrils and other multimeric structures	1	200.3×	0.007	COL7A1
Collagen degradation	1	175.7×	0.007	COL7A1
Collagen biosynthesis and modifying enzymes	1	170.4×	0.007	COL7A1
COPII-mediated vesicle transport	1	163.1×	0.007	COL7A1
Integrin cell surface interactions	1	134.3×	0.007	COL7A1

GO biological processes by enrichment

GO term	Cohort genes	Fold	FDR	Sample cohort genes
endodermal cell differentiation	1	495.6×	0.006	COL7A1
epidermis development	1	210.7×	0.007	COL7A1
cell adhesion	1	37.5×	0.027	COL7A1

Therapeutics

Drug target analysis

Approved (phase 4): 0 · Phase ≥3: 0 · Phased (≥1): 0 · Undrugged: 1

Druggability breadth: 1 of 1 evidence-associated genes (100%) have a ChEMBL target (buckets above are over the deeply-mined display cohort).

Top cohort targets by molecule count

Symbol	Molecules	Max phase
COL7A1	0	0

Bioactivity and enzyme data

Enzyme cohort genes (≥1 EC): 0.

Pharmacogenomics

Cohort genes with a PharmGKB record: 1; with CPIC/DPWG dosing guidelines: 0.

No cohort gene has a CPIC/DPWG genotype-guided dosing guideline (PharmGKB).

Chemical tractability of cohort targets

0 approved/phased compounds have measured bioactivity against a cohort gene (and aren’t yet in disease-level trials). This is a research / tractability signal, NOT a therapeutic recommendation — a bioactivity row often reflects off-target or screening binding (e.g. promiscuous kinase inhibitors against a cohort kinase), implying no disease mechanism.

Druggability pyramid

Cohort genes binned by druggability tier (high → low):

Tier	Definition	Genes	Symbols
A	Approved (phase 4 drug)	0
B	Phased (≥1) drug, not yet approved	0
C	Druggable family + PDB, no drug	0
D	Druggable family + AlphaFold only, no drug	1	COL7A1
E	Difficult family or no structure, no drug	0

Undrugged target profiles

1 cohort genes are undrugged. Ranked by ‘starting-point quality’ (assay depth + drugged-partner adjacency).

Symbol	ChEMBL assays	Drugged partners (top 3)
COL7A1	0	—

Clinical trials & evidence

Clinical trials

Clinical trials: 0.

Cohort genes: COL7A1