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Epidermolysis bullosa simplex 5B, with muscular dystrophy(EBS5B)

MedGen UID:
418981
Concept ID:
C2931072
Disease or Syndrome
Synonyms: EBS5B; Epidermolysa bullosa simplex and limb girdle muscular dystrophy; EPIDERMOLYSIS BULLOSA SIMPLEX AND LIMB-GIRDLE MUSCULAR DYSTROPHY; Epidermolysis bullosa simplex with muscular dystrophy
SNOMED CT: Epidermolysis bullosa simplex with muscular dystrophy (723308003); Limb girdle muscular dystrophy with epidermolysis bullosa simplex (723308003)
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
141025
Concept ID:
C0441748
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
 
Gene (location): PLEC (8q24.3)
 
Monarch Initiative: MONDO:0009181
OMIM®: 226670
Orphanet: ORPHA257

Disease characteristics

Excerpted from the GeneReview: Epidermolysis Bullosa Simplex
Epidermolysis bullosa simplex (EBS) is characterized by fragility of the skin (and mucosal epithelia in some instances) that results in non-scarring blisters and erosions caused by minor mechanical trauma. EBS is distinguished from other types of epidermolysis bullosa (EB) or non-EB skin fragility syndromes by the location of the blistering in relation to the dermal-epidermal junction. In EBS, blistering occurs within basal keratinocytes. The severity of blistering ranges from limited to hands and feet to widespread involvement. Additional features can include hyperkeratosis of the palms and soles (keratoderma), nail dystrophy, milia, and hyper- and/or hypopigmentation. Rare EBS subtypes have been associated with additional clinical features including pyloric atresia, muscular dystrophy, cardiomyopathy, and/or nephropathy. [from GeneReviews]
Authors:
Jodi Y So  |  Joyce Teng   view full author information

Additional description

From OMIM
Epidermolysis bullosa simplex with muscular dystrophy (EBS5B) is an autosomal recessive disorder characterized by early childhood onset of progressive muscular dystrophy and blistering skin changes (Fine et al., 1989). Fine et al. (1991) reported a revised classification of the subtypes of inherited epidermolysis bullosa. In reports of 2 consensus meetings on EB, Fine et al. (2000, 2008) referred to EB with muscular dystrophy due to PLEC1 mutations as a form of basal simplex EB. Fine et al. (2000, 2008) also eliminated the term 'hemidesmosomal,' which had previously been proposed for this entity (Uitto et al., 1997) because ultrastructural analysis can demonstrate tissue abnormalities of the hemidesmosomes. For a discussion of genetic heterogeneity of the subtypes of EBS, see EBS1A (131760).  http://www.omim.org/entry/226670

Clinical features

From HPO
Urethral stricture
MedGen UID:
1641821
Concept ID:
C4551691
Pathologic Function
Narrowing of the urethra associated with inflammation or scar tissue.
Palmoplantar keratosis
MedGen UID:
44017
Concept ID:
C0022596
Disease or Syndrome
Abnormal thickening of the skin localized to the palm of the hand and the sole of the foot.
Short stature
MedGen UID:
87607
Concept ID:
C0349588
Finding
A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).
Anemia
MedGen UID:
1526
Concept ID:
C0002871
Disease or Syndrome
A reduction in erythrocytes volume or hemoglobin concentration.
Muscular dystrophy
MedGen UID:
44527
Concept ID:
C0026850
Disease or Syndrome
The term dystrophy means abnormal growth. However, muscular dystrophy is used to describe primary myopathies with a genetic basis and a progressive course characterized by progressive skeletal muscle weakness and wasting, defects in muscle proteins, and histological features of muscle fiber degeneration (necrosis) and regeneration. If possible, it is preferred to use other HPO terms to describe the precise phenotypic abnormalities.
Muscle fiber splitting
MedGen UID:
322813
Concept ID:
C1836057
Finding
Fiber splitting or branching is a common finding in human and rat skeletal muscle pathology. Fiber splitting refers to longitudinal halving of the complete fiber, while branching originates from a regenerating end of a necrotic fiber as invaginations of the sarcolemma. In fiber branching, one end of the fiber remains intact as a single entity, while the other end has several branches.
Increased variability in muscle fiber diameter
MedGen UID:
336019
Concept ID:
C1843700
Finding
An abnormally high degree of muscle fiber size variation. This phenotypic feature can be observed upon muscle biopsy.
Increased connective tissue
MedGen UID:
400898
Concept ID:
C1866021
Finding
The presence of an abnormally increased amount of connective tissue.
Motheaten muscle fibers
MedGen UID:
867770
Concept ID:
C4022160
Finding
Neonatal respiratory distress
MedGen UID:
924182
Concept ID:
C4281993
Finding
Respiratory difficulty as newborn.
Keratitis
MedGen UID:
44013
Concept ID:
C0022568
Disease or Syndrome
Inflammation of the cornea.
Punctate keratitis
MedGen UID:
736733
Concept ID:
C1562761
Disease or Syndrome
A type of keratitis characterized by inflammation in pinpoint areas of the corneal epithelium.
Carious teeth
MedGen UID:
8288
Concept ID:
C0011334
Disease or Syndrome
Caries is a multifactorial bacterial infection affecting the structure of the tooth. This term has been used to describe the presence of more than expected dental caries.
Enamel hypoplasia
MedGen UID:
3730
Concept ID:
C0011351
Disease or Syndrome
Developmental hypoplasia of the dental enamel.
Scarring alopecia of scalp
MedGen UID:
812631
Concept ID:
C3806301
Finding
Nail dystrophy
MedGen UID:
66368
Concept ID:
C0221260
Disease or Syndrome
Onychodystrophy (nail dystrophy) refers to nail changes apart from changes of the color (nail dyschromia) and involves partial or complete disruption of the various keratinous layers of the nail plate.
Milia
MedGen UID:
87528
Concept ID:
C0345996
Anatomical Abnormality
Presence of multiple small cysts containing keratin (skin protein) and presenting as tiny pearly-white bumps just under the surface of the skin.
Nail dysplasia
MedGen UID:
331737
Concept ID:
C1834405
Congenital Abnormality
The presence of developmental dysplasia of the nail.
Abnormal blistering of the skin
MedGen UID:
412159
Concept ID:
C2132198
Finding
The presence of one or more bullae on the skin, defined as fluid-filled blisters more than 5 mm in diameter with thin walls.
Intra-epidermal blistering
MedGen UID:
1779880
Concept ID:
C5539821
Finding
A type of blistering in which the lesions are located within the epidermis with loss of cell-cell adhesion of keratinocytes. In simplex EB, cleavage occurs in the basal layer, which is the innermost layer of the epidermis and consists of a single layer of basal germinative cells (mostly epidermal Keratinocytes) that proliferate and thereby produce new cells for other epidermal layers. As the cells move towards the upper layers of the epidermis they mature and eventually form cornified cells. The suprabasal cell layer lies directly above the basal layer and is composed of five to ten layers of cells.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVEpidermolysis bullosa simplex 5B, with muscular dystrophy
Follow this link to review classifications for Epidermolysis bullosa simplex 5B, with muscular dystrophy in Orphanet.

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