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Finnish upper limb-onset distal myopathy(MPD3)

MedGen UID:
400595
Concept ID:
C1864706
Disease or Syndrome
Synonym: Myopathy, distal, 3
SNOMED CT: Finnish upper limb onset distal myopathy (763718009); Distal myopathy type 3 (763718009)
 
Gene (location): HNRNPA1 (12q13.13)
 
Monarch Initiative: MONDO:0012410
OMIM®: 610099
Orphanet: ORPHA399086

Definition

Distal myopathy-3 (MPD3) is an autosomal dominant skeletal muscle disorder characterized by adult onset of slowly progressive distal muscular weakness and atrophy affecting the upper and lower limbs, leading to difficulties using the hands and walking difficulties. Proximal muscle involvement may occur later in the disease, but patients typically remain ambulatory. Muscle biopsy shows myopathic changes with rimmed vacuoles (Hackman et al., 2021). [from OMIM]

Clinical features

From HPO
Split hand
MedGen UID:
397570
Concept ID:
C2699510
Congenital Abnormality
A condition in which middle parts of the hand (fingers and metacarpals) are missing giving a cleft appearance. The severity is very variable ranging from slightly hypoplastic middle fingers over absent middle fingers as far as oligo- or monodactyl hands.
Abnormal foot morphology
MedGen UID:
1762829
Concept ID:
C5399834
Anatomical Abnormality
An abnormality of the skeleton of foot.
Clumsiness
MedGen UID:
66690
Concept ID:
C0233844
Sign or Symptom
Lack of physical coordination resulting in an abnormal tendency to drop items or bump into objects.
Steppage gait
MedGen UID:
98105
Concept ID:
C0427149
Finding
An abnormal gait pattern that arises from weakness of the pretibial and peroneal muscles due to a lower motor neuron lesion. Affected patients have footdrop and are unable to dorsiflex and evert the foot. The leg is lifted high on walking so that the toes clear the ground, and there may be a slapping noise when the foot strikes the ground again.
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.
Joint contracture of the hand
MedGen UID:
56382
Concept ID:
C0158113
Finding
Contractures of one ore more joints of the hands meaning chronic loss of joint motion due to structural changes in non-bony tissue.
Distal muscle weakness
MedGen UID:
140883
Concept ID:
C0427065
Finding
Reduced strength of the musculature of the distal extremities.
Distal amyotrophy
MedGen UID:
338530
Concept ID:
C1848736
Disease or Syndrome
Muscular atrophy affecting muscles in the distal portions of the extremities.
Rimmed vacuoles
MedGen UID:
340089
Concept ID:
C1853932
Finding
Presence of abnormal vacuoles (membrane-bound organelles) in the sarcolemma. On histological staining with hematoxylin and eosin, rimmed vacuoles are popcorn-like clear vacuoles with a densely blue rim. The vacuoles are often associated with cytoplasmic and occasionally intranuclear eosinophilic inclusions.
EMG: myopathic abnormalities
MedGen UID:
867362
Concept ID:
C4021726
Pathologic Function
The presence of abnormal electromyographic patterns indicative of myopathy, such as small-short polyphasic motor unit potentials.
Late-onset proximal muscle weakness
MedGen UID:
871110
Concept ID:
C4025578
Finding
Lack of strength of the proximal musculature occurring late in the clinical course.
Mildly elevated creatine kinase
MedGen UID:
342469
Concept ID:
C1850309
Finding

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVFinnish upper limb-onset distal myopathy
Follow this link to review classifications for Finnish upper limb-onset distal myopathy in Orphanet.

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