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Autosomal recessive limb-girdle muscular dystrophy type 2G(LGMDR7)

MedGen UID:
400895
Concept ID:
C1866008
Disease or Syndrome
Synonyms: LGMDR7; Limb-girdle muscular dystrophy, type 2G; MUSCULAR DYSTROPHY, LIMB-GIRDLE, AUTOSOMAL RECESSIVE 7; Telethoninopathy
SNOMED CT: Autosomal recessive limb girdle muscular dystrophy type 2G (720522001); Limb girdle muscular dystrophy due to telethonin deficiency (720522001)
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): TCAP (17q12)
 
Monarch Initiative: MONDO:0011170
OMIM®: 601954
Orphanet: ORPHA34514

Definition

A mild form of limb-girdle muscular dystrophy with characteristics of muscle weakness in the four limbs, mild scapular winging, severe atrophy of the quadriceps and anterior tibialis muscles, calf hypertrophy and lack of respiratory and cardiac involvement. [from SNOMEDCT_US]

Clinical features

From HPO
Distal lower limb muscle weakness
MedGen UID:
324514
Concept ID:
C1836450
Finding
Reduced strength of the distal musculature of the legs.
Areflexia of lower limbs
MedGen UID:
347285
Concept ID:
C1856694
Finding
Inability to elicit tendon reflexes in the lower limbs.
Foot dorsiflexor weakness
MedGen UID:
356163
Concept ID:
C1866141
Finding
Weakness of the muscles responsible for dorsiflexion of the foot, that is, of the movement of the toes towards the shin. The foot dorsiflexors include the tibialis anterior, the extensor hallucis longus, the extensor digitorum longus, and the peroneus tertius muscles.
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.
Difficulty climbing stairs
MedGen UID:
68676
Concept ID:
C0239067
Finding
Reduced ability to climb stairs.
Difficulty walking
MedGen UID:
86319
Concept ID:
C0311394
Finding
Reduced ability to walk (ambulate).
Difficulty running
MedGen UID:
108251
Concept ID:
C0560346
Finding
Reduced ability to run.
Distal lower limb amyotrophy
MedGen UID:
324515
Concept ID:
C1836451
Disease or Syndrome
Muscular atrophy of distal leg muscles.
Calf muscle hypertrophy
MedGen UID:
335868
Concept ID:
C1843057
Finding
Muscle hypertrophy affecting the calf muscles.
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.
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.
Proximal muscle weakness in lower limbs
MedGen UID:
356423
Concept ID:
C1866010
Finding
A lack of strength of the proximal muscles of the legs.
Proximal muscle weakness in upper limbs
MedGen UID:
356424
Concept ID:
C1866012
Finding
A lack of strength of the proximal muscles of the arms.
Proximal upper limb amyotrophy
MedGen UID:
356138
Concept ID:
C1866013
Finding
Muscular atrophy affecting proximally located muscles of the arms.
Increased connective tissue
MedGen UID:
400898
Concept ID:
C1866021
Finding
The presence of an abnormally increased amount of connective tissue.
Elevated circulating creatine kinase concentration
MedGen UID:
69128
Concept ID:
C0241005
Finding
An elevation of the level of the enzyme creatine kinase (also known as creatine phosphokinase (CK; EC 2.7.3.2) in the blood. CK levels can be elevated in a number of clinical disorders such as myocardial infarction, rhabdomyolysis, and muscular dystrophy.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
Follow this link to review classifications for Autosomal recessive limb-girdle muscular dystrophy type 2G in Orphanet.

Recent clinical studies

Etiology

Lv X, Gao F, Dai T, Zhao D, Jiang W, Geng H, Liu F, Lin P, Yan C
Neurogenetics 2021 Mar;22(1):1-10. Epub 2020 Aug 6 doi: 10.1007/s10048-020-00623-4. PMID: 32761539
Chamova T, Bichev S, Todorov T, Gospodinova M, Taneva A, Kastreva K, Zlatareva D, Krupev M, Hadjiivanov R, Guergueltcheva V, Grozdanova L, Tzoneva D, Huebner A, V der Hagen M, Schoser B, Lochmüller H, Todorova A, Tournev I
Neuromuscul Disord 2018 Aug;28(8):625-632. Epub 2018 May 17 doi: 10.1016/j.nmd.2018.05.005. PMID: 29935994
Moreira ES, Wiltshire TJ, Faulkner G, Nilforoushan A, Vainzof M, Suzuki OT, Valle G, Reeves R, Zatz M, Passos-Bueno MR, Jenne DE
Nat Genet 2000 Feb;24(2):163-6. doi: 10.1038/72822. PMID: 10655062

Diagnosis

Lv X, Gao F, Dai T, Zhao D, Jiang W, Geng H, Liu F, Lin P, Yan C
Neurogenetics 2021 Mar;22(1):1-10. Epub 2020 Aug 6 doi: 10.1007/s10048-020-00623-4. PMID: 32761539

Prognosis

Chamova T, Bichev S, Todorov T, Gospodinova M, Taneva A, Kastreva K, Zlatareva D, Krupev M, Hadjiivanov R, Guergueltcheva V, Grozdanova L, Tzoneva D, Huebner A, V der Hagen M, Schoser B, Lochmüller H, Todorova A, Tournev I
Neuromuscul Disord 2018 Aug;28(8):625-632. Epub 2018 May 17 doi: 10.1016/j.nmd.2018.05.005. PMID: 29935994
Moreira ES, Wiltshire TJ, Faulkner G, Nilforoushan A, Vainzof M, Suzuki OT, Valle G, Reeves R, Zatz M, Passos-Bueno MR, Jenne DE
Nat Genet 2000 Feb;24(2):163-6. doi: 10.1038/72822. PMID: 10655062

Clinical prediction guides

Lv X, Gao F, Dai T, Zhao D, Jiang W, Geng H, Liu F, Lin P, Yan C
Neurogenetics 2021 Mar;22(1):1-10. Epub 2020 Aug 6 doi: 10.1007/s10048-020-00623-4. PMID: 32761539

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