Charcot-Marie-Tooth disease type 2B1

disease
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Also known as AR-CMT2B1autosomal recessive axonal CMT4C1autosomal recessive Charcot-Marie-Tooth disease type 2B1Charcot Marie Tooth disease type 2B1Charcot-Marie-Tooth disease type 2 caused by mutation in LMNACharcot-Marie-Tooth disease, axonal, type 2B1Charcot-Marie-Tooth disease, type 2B1CMT 2B1CMT2B1LMNA Charcot-Marie-Tooth disease type 2

Summary

Charcot-Marie-Tooth disease type 2B1 (MONDO:0011569) is a disease caused by LMNA (GenCC Strong), with 1 cohort gene and 1 clinical trial.

At a glance

  • Prevalence: Unknown (Worldwide)
  • Causal gene: LMNA (GenCC Strong)
  • Cohort genes: 1
  • ClinVar variants: 234
  • Phenotypes (HPO): 33
  • Clinical trials: 1

Clinical features

Signs & symptoms

Clinical features (HPO)

33 HPO clinical features (Orphanet curated; top 33 by frequency):

HPO IDTermFrequency
HP:0002936Distal sensory impairmentVery frequent (80-99%)
HP:0003380Decreased number of peripheral myelinated nerve fibersVery frequent (80-99%)
HP:0003390Sensory axonal neuropathyVery frequent (80-99%)
HP:0003447Axonal lossVery frequent (80-99%)
HP:0003482EMG: axonal abnormalityVery frequent (80-99%)
HP:0007002Motor axonal neuropathyVery frequent (80-99%)
HP:0007078Decreased amplitude of sensory action potentialsVery frequent (80-99%)
HP:0009053Distal lower limb muscle weaknessVery frequent (80-99%)
HP:0040078Axonal degenerationVery frequent (80-99%)
HP:0001284AreflexiaFrequent (30-79%)
HP:0001760Abnormal foot morphologyFrequent (30-79%)
HP:0001761Pes cavusFrequent (30-79%)
HP:0001765HammertoeFrequent (30-79%)
HP:0002460Distal muscle weaknessFrequent (30-79%)
HP:0003376Steppage gaitFrequent (30-79%)
HP:0003387Decreased number of large peripheral myelinated nerve fibersFrequent (30-79%)
HP:0003693Distal amyotrophyFrequent (30-79%)
HP:0003701Proximal muscle weaknessFrequent (30-79%)
HP:0007149Distal upper limb amyotrophyFrequent (30-79%)
HP:0008956Proximal lower limb amyotrophyFrequent (30-79%)
HP:0008959Distal upper limb muscle weaknessFrequent (30-79%)
HP:0008994Proximal muscle weakness in lower limbsFrequent (30-79%)
HP:0009049Peroneal muscle atrophyFrequent (30-79%)
HP:0009130Hand muscle atrophyFrequent (30-79%)
HP:0011916Toe extensor amyotrophyFrequent (30-79%)
HP:0030237Hand muscle weaknessFrequent (30-79%)
HP:0002540Inability to walkOccasional (5-29%)
HP:0003724Shoulder girdle muscle atrophyOccasional (5-29%)
HP:0007126Proximal amyotrophyOccasional (5-29%)
HP:0007249Decreased number of small peripheral myelinated nerve fibersOccasional (5-29%)
HP:0008988Pelvic girdle muscle atrophyOccasional (5-29%)
HP:0007233Clusters of axonal regenerationExcluded (0%)
HP:0003431Decreased motor nerve conduction velocityVery rare (<1-4%)

Identifiers

Disease identifiers

FieldValue
Canonical nameCharcot-Marie-Tooth disease type 2B1
Mondo IDMONDO:0011569
MeSHC537990
OMIM605588
Orphanet98856
DOIDDOID:0110156
ICD-11957134152
SNOMED CT725048002
UMLSC1854154
MedGen343064
GARD0008548
Is cancer (heuristic)no

Also known as: AR-CMT2B1 · autosomal recessive axonal CMT4C1 · autosomal recessive Charcot-Marie-Tooth disease type 2B1 · Charcot Marie Tooth disease type 2B1 · Charcot-Marie-Tooth disease type 2 caused by mutation in LMNA · Charcot-Marie-Tooth disease, axonal, type 2B1 · Charcot-Marie-Tooth disease, type 2B1 · CMT 2B1 · CMT2B1 · LMNA Charcot-Marie-Tooth disease type 2

Data availability: 234 ClinVar variants · 5 GenCC gene-disease records.

Disease family

Classification path: disease › human disease › disease by body system or component › nervous system disorderperipheral nervous system disorderperipheral neuropathyhereditary peripheral neuropathyCharcot-Marie-Tooth diseaseCharcot-Marie-Tooth disease type 2Charcot-Marie-Tooth disease type 2B1

Related subtypes (37): Charcot-Marie-Tooth disease type 2A1, Charcot-Marie-Tooth disease type 2B, Charcot-Marie-Tooth disease type 2D, Charcot-Marie-Tooth disease type 2B2, Charcot-Marie-Tooth disease axonal type 2C, Charcot-Marie-Tooth disease axonal type 2F, Charcot-Marie-Tooth disease type 2I, Charcot-Marie-Tooth disease type 2E, Charcot-Marie-Tooth disease axonal type 2H, Charcot-Marie-Tooth disease type 2J, Charcot-Marie-Tooth disease axonal type 2K, Charcot-Marie-Tooth disease axonal type 2L, Charcot-Marie-Tooth disease type 2A2, giant axonal neuropathy 2, Charcot-Marie-Tooth disease axonal type 2N, Charcot-Marie-Tooth disease axonal type 2O, Charcot-Marie-Tooth disease axonal type 2P, Charcot-Marie-Tooth disease axonal type 2Q, Charcot-Marie-Tooth disease type 2R, Charcot-Marie-Tooth disease axonal type 2S, Charcot-Marie-Tooth disease axonal type 2U, Charcot-Marie-Tooth disease axonal type 2V, autosomal dominant Charcot-Marie-Tooth disease type 2W, Charcot-Marie-Tooth disease axonal type 2X, Charcot-Marie-Tooth disease type 2Y, Charcot-Marie-Tooth disease axonal type 2Z, Charcot-Marie-Tooth disease axonal type 2CC, autosomal dominant Charcot-Marie-Tooth disease type 2M, Charcot-Marie-Tooth disease type 2B5, autosomal dominant Charcot-Marie-Tooth disease type 2 due to KIF5A mutation, autosomal dominant Charcot-Marie-Tooth disease type 2 due to TFG mutation, autosomal dominant Charcot-Marie-Tooth disease type 2K, Charcot-Marie-Tooth disease, axonal, type 2EE, autosomal dominant charcot-marie-tooth disease type 2 due to DGAT2 mutation, Charcot-Marie-Tooth disease type 2T, MME-related autosomal dominant Charcot Marie Tooth disease type 2, Charcot-Marie-tooth disease, axonal, type 2DD

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

ClinVar germline variants

234 retrieved; paginated sample, class counts are floors:

110 uncertain significance, 70 conflicting classifications of pathogenicity, 18 likely benign, 10 benign/likely benign, 9 pathogenic/likely pathogenic, 7 pathogenic, 4 benign, 3 uncertain significance/uncertain risk allele, 2 likely pathogenic, 1 not provided

ClinVarVariant (HGVS)GeneClassificationReview
14489NM_170707.4(LMNA):c.1444C>T (p.Arg482Trp)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
14495NM_170707.4(LMNA):c.1130G>A (p.Arg377His)LMNAPathogeniccriteria provided, multiple submitters, no conflicts
1457399NM_170707.4(LMNA):c.822del (p.Arg275fs)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
200941NM_170707.4(LMNA):c.768G>A (p.Val256=)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
3595598NM_170707.4(LMNA):c.5del (p.Glu2fs)LMNAPathogeniccriteria provided, multiple submitters, no conflicts
36473NM_170707.4(LMNA):c.1003C>T (p.Arg335Trp)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
48031NM_170707.4(LMNA):c.1129C>T (p.Arg377Cys)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
48070NM_170707.4(LMNA):c.607G>A (p.Glu203Lys)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
48096NM_170707.4(LMNA):c.961C>T (p.Arg321Ter)LMNAPathogeniccriteria provided, multiple submitters, no conflicts
66762NM_170707.4(LMNA):c.1045C>T (p.Arg349Trp)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
66800NM_170707.4(LMNA):c.1294C>T (p.Gln432Ter)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
66817NM_170707.4(LMNA):c.1380+1G>ALMNAPathogeniccriteria provided, multiple submitters, no conflicts
66853NM_170707.4(LMNA):c.1608+1G>ALMNAPathogeniccriteria provided, multiple submitters, no conflicts
66908NM_170707.4(LMNA):c.568C>T (p.Arg190Trp)LMNAPathogeniccriteria provided, multiple submitters, no conflicts
66924NM_170707.4(LMNA):c.694G>C (p.Gly232Arg)LMNAPathogeniccriteria provided, single submitter
66931NM_170707.4(LMNA):c.746G>A (p.Arg249Gln)LMNAPathogenic/Likely pathogeniccriteria provided, multiple submitters, no conflicts
1343751NM_170707.4(LMNA):c.1646_1647del (p.Val549fs)LMNALikely pathogeniccriteria provided, multiple submitters, no conflicts
3896901NM_170707.4(LMNA):c.1004G>C (p.Arg335Pro)LMNALikely pathogeniccriteria provided, single submitter
224680NM_170707.4(LMNA):c.985C>G (p.Arg329Gly)LMNAUncertain significance/Uncertain risk allelecriteria provided, multiple submitters, no conflicts
48078NM_170707.4(LMNA):c.749C>T (p.Ala250Val)LMNAUncertain significance/Uncertain risk allelecriteria provided, multiple submitters, no conflicts
586129NM_170707.4(LMNA):c.953C>T (p.Ala318Val)LMNAUncertain significance/Uncertain risk allelecriteria provided, multiple submitters, no conflicts
1029259NM_170707.4(LMNA):c.187A>C (p.Ile63Leu)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
1284657NM_170707.4(LMNA):c.1786_1800del (p.Asp596_Ala600del)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14486NM_170707.4(LMNA):c.1445G>A (p.Arg482Gln)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14494NM_170707.4(LMNA):c.1745G>A (p.Arg582His)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14498NM_170707.4(LMNA):c.892C>T (p.Arg298Cys)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14499NM_170707.4(LMNA):c.1580G>A (p.Arg527His)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14517NM_170707.4(LMNA):c.1718C>T (p.Ser573Leu)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14519NM_170707.4(LMNA):c.1195C>T (p.Arg399Cys)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications
14520NM_170707.4(LMNA):c.1318G>A (p.Val440Met)LMNAConflicting classifications of pathogenicitycriteria provided, conflicting classifications

Genes & proteins

Mendelian disease overlap and somatic drivers

GenCC: 40 · Orphanet: 21 · 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.

GeneClassificationInheritanceDiseaseRecords
LMNAStrongAutosomal dominantCharcot-Marie-Tooth disease type 2B140

Orphanet rare-disease linkage (cohort genes)

GeneOrphanet IDRare disease
LMNAOrphanet:154Familial isolated dilated cardiomyopathy
LMNAOrphanet:157973Congenital muscular dystrophy due to LMNA mutation
LMNAOrphanet:1662Restrictive dermopathy
LMNAOrphanet:168796Heart-hand syndrome, Slovenian type
LMNAOrphanet:2229Dilated cardiomyopathy-hypergonadotropic hypogonadism syndrome
LMNAOrphanet:2348Familial partial lipodystrophy, Dunnigan type
LMNAOrphanet:280365Autosomal semi-dominant severe lipodystrophic laminopathy
LMNAOrphanet:293888Inherited isolated arrhythmogenic cardiomyopathy, dominant-left variant
LMNAOrphanet:293899Inherited isolated arrhythmogenic ventricular dysplasia, biventricular variant
LMNAOrphanet:293910Inherited isolated arrhythmogenic cardiomyopathy, dominant-right variant
LMNAOrphanet:300751Familial dilated cardiomyopathy with conduction defect due to LMNA mutation
LMNAOrphanet:363618LMNA-related cardiocutaneous progeria syndrome
LMNAOrphanet:54260Left ventricular noncompaction
LMNAOrphanet:675396Epithelioid hemangioma
LMNAOrphanet:740Hutchinson-Gilford progeria syndrome
LMNAOrphanet:79084Familial partial lipodystrophy, Köbberling type
LMNAOrphanet:79474Atypical Werner syndrome
LMNAOrphanet:90153Mandibuloacral dysplasia with type A lipodystrophy
LMNAOrphanet:98853Autosomal dominant Emery-Dreifuss muscular dystrophy
LMNAOrphanet:98855Autosomal recessive Emery-Dreifuss muscular dystrophy
LMNAOrphanet:98856Charcot-Marie-Tooth disease type 2B1

Cohort genes → proteins

1 cohort genes, 1 distinct canonical proteins.

Evidence partition

SubsetGenes
multi_evidence1

Cohort genes (full)

SymbolHGNCEnsemblUniProtNameEvidence
LMNAHGNC:6636ENSG00000160789P02545Prelamin-A/Cgencc,clinvar

Cohort function summary

Lead sentence per gene, UniProt-curated.

SymbolProtein nameFunction (lead sentence)
LMNAPrelamin-A/CLamins are intermediate filament proteins that assemble into a filamentous meshwork, and which constitute the major components of the nuclear lamina, a fibrous layer on the nucleoplasmic side of the inner nuclear membrane.

Protein-family classification

Druggable: 0 · Difficult: 0 · Unknown: 1 · Druggable fraction: 0.0

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.

FamilyGenesFoldFDR
Other/Unknown11.8×0.558

Per-gene assignment

SymbolFamilyDruggable?ECInterPro (top 3)
LMNAOther/UnknownnoLamin_tail_dom, IF_conserved, Lamin_tail_dom_sf

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)

BucketGenes
narrow (1-5 tissues)0
moderate (6-20)0
broad (>20)1
unknown0

Top tissues across cohort

TissueCohort genes
mucosa of stomach1
nipple1
skin of abdomen1

Per-gene tissue summary (top 30)

SymbolBgee breadthFANTOM5 breadthSCXATop tissues
LMNA295ubiquitousmarkernipple, mucosa of stomach, skin of abdomen

Protein interactions among cohort

Intra-cohort edges: 0.

Hub genes (top 10 by interactor count)

SymbolInteractor count
LMNA7,173

Structural data

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

Cohort genes with PDB structures (top 30)

SymbolUniProtPDB entries
LMNAP0254528

Function

Pathway analysis

Distinct Reactome pathways touched by cohort: 15. 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.

PathwayCohort genesFoldFDRSample cohort genes
Breakdown of the nuclear lamina13806.7×0.004LMNA
Depolymerization of the Nuclear Lamina1761.3×0.005LMNA
Initiation of Nuclear Envelope (NE) Reformation1601.0×0.005LMNA
IRE1alpha activates chaperones1519.1×0.005LMNA
Deregulated CDK5 triggers multiple neurodegenerative pathways in Alzheimer’s disease models1519.1×0.005LMNA
Nuclear Envelope Breakdown1456.8×0.005LMNA
Unfolded Protein Response (UPR)1356.9×0.006LMNA
Oncogenic MAPK signaling1248.3×0.008LMNA
XBP1(S) activates chaperone genes1215.5×0.008LMNA
Signaling by BRAF and RAF1 fusions1170.4×0.009LMNA
Meiotic synapsis1141.0×0.010LMNA
Diseases of signal transduction by growth factor receptors and second messengers156.8×0.022LMNA
Cellular responses to stress136.8×0.031LMNA
Cellular responses to stimuli131.5×0.034LMNA
Disease113.1×0.076LMNA

GO biological processes 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.

GO termCohort genesFoldFDRSample cohort genes
DNA double-strand break attachment to nuclear envelope15617.3×0.002LMNA
establishment or maintenance of microtubule cytoskeleton polarity14213.0×0.002LMNA
nuclear pore localization13370.4×0.002LMNA
negative regulation of mesenchymal cell proliferation12808.7×0.002LMNA
protein localization to nuclear envelope12106.5×0.002LMNA
regulation of protein localization to nucleus12106.5×0.002LMNA
negative regulation of cardiac muscle hypertrophy in response to stress11872.4×0.002LMNA
ventricular cardiac muscle cell development11532.0×0.002LMNA
nuclear envelope organization1991.3×0.003LMNA
regulation of telomere maintenance1842.6×0.003LMNA
negative regulation of release of cytochrome c from mitochondria1802.5×0.003LMNA
nuclear migration1732.7×0.003LMNA
double-strand break repair via nonhomologous end joining1421.3×0.004LMNA
negative regulation of extrinsic apoptotic signaling pathway1421.3×0.004LMNA
protein localization to nucleus1351.1×0.005LMNA
cellular senescence1295.6×0.005LMNA
heterochromatin formation1255.3×0.006LMNA
muscle organ development1166.8×0.008LMNA
regulation of cell migration1157.5×0.008LMNA
protein import into nucleus1144.0×0.009LMNA
regulation of protein stability1125.8×0.009LMNA
cellular response to hypoxia1121.2×0.009LMNA
intracellular protein localization1104.7×0.010LMNA
negative regulation of cell population proliferation142.1×0.025LMNA
positive regulation of gene expression138.7×0.026LMNA

Therapeutics

Drug target analysis

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

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

Genes with an approved drug

The molecule shown is one approved compound that hits the gene — not necessarily a drug of choice or one indicated for this disease.

SymbolExample approved molecule
LMNABEPRIDIL

Top cohort targets by molecule count

SymbolMoleculesMax phase
LMNA8234

Drugs targeting cohort genes (top 30)

MoleculeMax phaseTargets in cohort
BEPRIDIL4LMNA
PHENYLBUTAZONE4LMNA
CEFOTAXIME SODIUM4LMNA
DIENESTROL4LMNA
IFOSFAMIDE4LMNA
PROGESTERONE4LMNA
CLOTRIMAZOLE4LMNA
DAPSONE4LMNA
AMINOCAPROIC ACID4LMNA
FLUCONAZOLE4LMNA
COLCHICINE4LMNA
NABUMETONE4LMNA
OXAPROZIN4LMNA
BUMETANIDE4LMNA
GLIPIZIDE4LMNA
BROMFENAC4LMNA
ROPIVACAINE4LMNA
TIZANIDINE4LMNA
METAXALONE4LMNA
CARBAMAZEPINE4LMNA
SALMETEROL XINAFOATE4LMNA
AMIODARONE HYDROCHLORIDE4LMNA
METHYL SALICYLATE4LMNA
DIBUCAINE4LMNA
PHENELZINE4LMNA
HYDROCORTISONE ACETATE4LMNA
BRETYLIUM TOSYLATE4LMNA
IMIPRAMINE4LMNA
FURAZOLIDONE4LMNA
DROPERIDOL4LMNA

Bioactivity and enzyme data

Enzyme cohort genes (≥1 EC): 0.

Cohort genes with ChEMBL bioactivity (full, sorted by assay count)

SymbolAssaysType breakdown
LMNA12Binding:9, Functional:3

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

30 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.

CompoundMax phaseCohort target (bioactivity)
BEPRIDIL4LMNA
PHENYLBUTAZONE4LMNA
CEFOTAXIME SODIUM4LMNA
DIENESTROL4LMNA
IFOSFAMIDE4LMNA
PROGESTERONE4LMNA
CLOTRIMAZOLE4LMNA
DAPSONE4LMNA
AMINOCAPROIC ACID4LMNA
FLUCONAZOLE4LMNA
COLCHICINE4LMNA
NABUMETONE4LMNA
OXAPROZIN4LMNA
BUMETANIDE4LMNA
GLIPIZIDE4LMNA
BROMFENAC4LMNA
ROPIVACAINE4LMNA
TIZANIDINE4LMNA
METAXALONE4LMNA
CARBAMAZEPINE4LMNA
SALMETEROL XINAFOATE4LMNA
AMIODARONE HYDROCHLORIDE4LMNA
METHYL SALICYLATE4LMNA
DIBUCAINE4LMNA
PHENELZINE4LMNA
HYDROCORTISONE ACETATE4LMNA
BRETYLIUM TOSYLATE4LMNA
IMIPRAMINE4LMNA
FURAZOLIDONE4LMNA
DROPERIDOL4LMNA

Druggability pyramid

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

TierDefinitionGenesSymbols
AApproved (phase 4 drug)1LMNA
BPhased (≥1) drug, not yet approved0
CDruggable family + PDB, no drug0
DDruggable family + AlphaFold only, no drug0
EDifficult family or no structure, no drug0

Undrugged target profiles

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

Clinical trials & evidence

Clinical trials

Clinical trials: 1.

Phase distribution (across all retrieved trials)

PhaseTrials
Not specified1

Top trials by phase / activity

NCTPhaseStatusTitle
NCT05902351Not specifiedRECRUITINGNatural History Study for Charcot Marie Tooth Disease