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Features include always present findings: Distal sensory impairment; and common findings: Distal lower limb muscle weakness, Distal upper limb muscle weakness, Distal upper limb amyotrophy, and Distal lower limb amyotrophy and others. 8 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Arms and legs | 4 | Distal lower limb muscle weakness, Distal upper limb muscle weakness, Distal upper limb amyotrophy |
Muscles | 2 | Distal lower limb muscle weakness, Distal upper limb muscle weakness |
Eyes | 1 | Macular degeneration |
Skin | 1 | Hyperextensible skin |
To date, six families with autosomal recessive FBLN5-related cutis laxa have been described [, , , , , , ]. Intrafamilial variability in age of onset is observed. Cutis laxa. The most common finding in FBLN5-related cutis laxa is described as furrowing of the skin of the whole body that is particularly obvious in the neck, axillae, and groin. The face has a "droopy" appearance with eyelid ptosis and drooping cheeks. When one tries to extend the skin, it does not display hyperelasticity as in the Ehlers-Danlos syndromes, but rather keeps its consistency. Pulmonary emphysema. Most affected individuals have early childhood-onset pulmonary emphysema, and some individuals have presented with emphysema during the neonatal period.
Source: GeneReviews — "FBLN5-Related Cutis Laxa"
FBLN5 encodes fibulin 5 (448 aa). Essential for elastic fiber formation, is involved in the assembly of continuous elastin (ELN) polymer and promotes the interaction of microfibrils and ELN. Highest expression in Artery Aorta (795.1 TPM) and Cells Cultured fibroblasts (292.3 TPM).
Charcot-Marie-Tooth disease, demyelinating, IIA 1H is associated with mutations in the FBLN5 gene on chromosome 14.
The FBLN5 protein participates in Tropoelastin associates with microfibrils pathway.
FBLN5 is classified as a druggable target (Druggable Genome category) with score 0.0.
FBLN5-related cutis laxa should be suspected in individuals with the following clinical features:
Cutis laxa
Pulmonary emphysema
Arterial involvement (e.g., peripheral pulmonary artery stenosis, supravalvar aortic stenosis)
Inguinal hernias
Hollow viscus diverticula (e.g., intestine, bladder)
Pyloric stenosis
The diagnosis of FBLN5-related cutis laxa is established in a proband with the above and biallelic pathogenic (or likely pathogenic) variants in FBLN5 (autosomal recessive FBLN5-related cutis laxa) or a heterozygous pathogenic (or likely pathogenic) variant in FBLN5 (autosomal dominant FBLN5-related cutis laxa) identified by molecular genetic testing .
Source: GeneReviews — "FBLN5-Related Cutis Laxa"
Other disorders characterized by cutis laxa are summarized in . EFEMP2-related cutis laxa (ARCL1B). EFEMP2-related cutis laxa is characterized by cutis laxa and systemic involvement, most commonly arterial tortuosity, aneurysms, and stenosis; retrognathia; joint laxity; and arachnodactyly. Severity ranges from perinatal lethality as a result of cardiopulmonary failure to manifestations limited to the vascular and craniofacial systems. The cutis laxa and emphysema are similar in FBLN4- or FBLN5-related cutis laxa; however, to date, the diaphragmatic changes and arterial aneurysms seem more predominant in EFEMP2-related cutis laxa. ATP6V0A2-related cutis laxa (ARCL2A) spans a phenotypic spectrum that includes Debr-type cutis laxa at the severe end and wrinkly skin syndrome at the mild end.
Source: GeneReviews — "FBLN5-Related Cutis Laxa"
Genetic testing for FBLN5 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Charcot-Marie-Tooth disease, demyelinating, IIA 1H has been reported in the published literature.
No approved treatments are currently available for Charcot-Marie-Tooth disease, demyelinating, IIA 1H. The disease remains an area of unmet medical need.
Gene therapy approaches for Charcot-Marie-Tooth disease, demyelinating, IIA 1H have been reported in the published literature.
Evaluations Following Initial Diagnosis To establish the extent of disease and needs in an individual diagnosed with FBLN5-related cutis laxa, the evaluations summarized (if not performed as part of the evaluation that led to the diagnosis) are recommended. Table 3. Recommended Evaluations Following Initial Diagnosis in Individuals with FBLN5-Related Cutis Laxa
System/Concern | Evaluation | Comment |
|---|---|---|
Cardiovascular | Echocardiogram | Consider pulmonary vessel angiogram if clinically indicated. |
Renal | Kidney ultrasound exam | Consider voiding cystoureterogram, given potential presence of urethral diverticula; catheterization should be done carefully. IV pyelogram may be an alternative. |
Gastrointestinal | Exam for inguinal hernia | Barium enema if clinically indicated |
Other | Consultation w/clinical geneticist /or genetic counselor | IV = intravenous Treatment of Manifestations Table 4. Treatment of Manifestations in Individuals with FBLN5-Related Cutis Laxa Manifestation/Concern |
Source: GeneReviews — "FBLN5-Related Cutis Laxa"
View trials for Charcot-Marie-Tooth disease, demyelinating, IIA 1H
Routine surveillance of the urinary tract for evidence of bladder diverticula and/or vesicoureteral reflux is indicated.
Source: GeneReviews — "FBLN5-Related Cutis Laxa"
Phenotype severity distribution: 1 always present feature, 5 common features.
No clinical trials have been registered for Charcot-Marie-Tooth disease, demyelinating, IIA 1H.
100 publications have been identified in PubMed for Charcot-Marie-Tooth disease, demyelinating, IIA 1H. Kisho has analyzed 51 by research type. Research spans Review / Meta-Analysis (71%), Basic Science / Preclinical (10%), and Other (8%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 36 | 71% |
Laboratory research | 5 | 10% |
Other research | 4 | 8% |
Disease patterns and progression | 4 | 8% |
Testing and diagnosis research | 1 | 2% |
New treatment approaches | 1 | 2% |
Miura M (2026). [PMID: 42151388](https://pubmed.ncbi.nlm.nih.gov/42151388/). *Sci Rep*. [Other]
Jiang F (2025). [PMID: 40649951](https://pubmed.ncbi.nlm.nih.gov/40649951/). *Int J Mol Sci*. [Review / Meta-Analysis]
Antropoli A (2025). [PMID: 39603590](https://pubmed.ncbi.nlm.nih.gov/39603590/). *Prog Retin Eye Res*. [Review / Meta-Analysis]
Sadeghi E (2025). [PMID: 39426529](https://pubmed.ncbi.nlm.nih.gov/39426529/). *Surv Ophthalmol*. [Review / Meta-Analysis]
Butovsky O (2025). [PMID: 40324382](https://pubmed.ncbi.nlm.nih.gov/40324382/). *Immunity*. [Review / Meta-Analysis]
Torkashvand A (2025). [PMID: 39854159](https://pubmed.ncbi.nlm.nih.gov/39854159/). *Curr Eye Res*. [Review / Meta-Analysis]
Foster E (2025). [PMID: 39930165](https://pubmed.ncbi.nlm.nih.gov/39930165/). *Adv Exp Med Biol*. [Review / Meta-Analysis]
He Y (2025). [PMID: 40251333](https://pubmed.ncbi.nlm.nih.gov/40251333/). *Sci Rep*. [Gene Therapy / Novel Therapeutics]
Bhandari SK (2025). [PMID: 41516080](https://pubmed.ncbi.nlm.nih.gov/41516080/). *Int J Mol Sci*. [Review / Meta-Analysis]
Charbel Issa P (2025). [PMID: 39820891](https://pubmed.ncbi.nlm.nih.gov/39820891/). *Klin Monbl Augenheilkd*. [Review / Meta-Analysis]
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 5:39 PM UTC
Online Mendelian Inheritance in Man
Common questions about Charcot-Marie-Tooth disease, demyelinating, IIA 1H