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Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome(MECRCN)

MedGen UID:
1798947
Concept ID:
C5567524
Disease or Syndrome
Synonyms: MECRCN; METABOLIC CRISES, RECURRENT, WITH RHABDOMYOLYSIS, CARDIAC ARRHYTHMIAS, AND NEURODEGENERATION; Metabolic encephalomyopathic crises, recurrent, with rhabdomyolysis, cardiac arrhythmias, and neurodegeneration
SNOMED CT: Transport and golgi organization 2 homolog-related metabolic encephalopathy, arrhythmia syndrome (1172698005); TANGO2-related metabolic encephalopathy, arrhythmia syndrome (1172698005); Recurrent metabolic encephalomyopathic crises, rhabdomyolysis, cardiac arrhythmia, intellectual disability syndrome (1172698005)
 
Gene (location): TANGO2 (22q11.21)
 
Monarch Initiative: MONDO:0018820
OMIM®: 616878
Orphanet: ORPHA480864

Disease characteristics

Excerpted from the GeneReview: TANGO2 Deficiency
TANGO2 deficiency is characterized by developmental delay, intellectual disability, gait incoordination, speech difficulties, seizures, and hypothyroidism. Most individuals have TANGO2 spells, non-life-threatening paroxysmal worsening of baseline symptoms, including sudden onset of hypotonia, ataxia with loss of balance, head and body tilt, increased dysarthria, drooling, lethargy, and disorientation. In addition, life-threatening acute metabolic crises can occur, including rhabdomyolysis with elevated creatine phosphokinase and liver transaminases, hypoglycemia, prolonged QTc on EKG, ventricular arrhythmias, and/or cardiomyopathy. [from GeneReviews]
Authors:
Christina Y Miyake  |  Lindsay Burrage  |  Kevin Glinton, et. al.   view full author information

Additional description

From OMIM
Recurrent metabolic crises with rhabdomyolysis, cardiac arrhythmias, and neurodegeneration (MECRCN) is an autosomal recessive disorder characterized by episodic metabolic degeneration affecting skeletal muscle, cardiac muscle, and the nervous system. Affected individuals usually present in childhood with acute encephalomyopathic features, including rhabdomyolysis, hypotonia, and neurologic regression, although most patients have delayed psychomotor development before the acute onset. The overall disease course is characterized by progressive neurodegeneration with epilepsy, cognitive impairment, pyramidal and cerebellar signs, and loss of expressive language. Cardiac involvement with severe arrhythmias is a consistent and potentially life-threatening manifestation (summary by Lalani et al., 2016 and Kremer et al., 2016).  http://www.omim.org/entry/616878

Clinical features

From HPO
Hereditary myoglobinuria
MedGen UID:
44557
Concept ID:
C0027080
Finding
Presence of myoglobin in the urine.
Ketonuria
MedGen UID:
56402
Concept ID:
C0162275
Finding
High levels of ketone bodies (acetoacetic acid, beta-hydroxybutyric acid, and acetone) in the urine. Ketone bodies are insignificant in the blood and urine of normal individuals in the postprandial or overnight-fasted state.
Hypertrophic cardiomyopathy
MedGen UID:
2881
Concept ID:
C0007194
Disease or Syndrome
Hypertrophic cardiomyopathy (HCM) is defined by the presence of increased ventricular wall thickness or mass in the absence of loading conditions (hypertension, valve disease) sufficient to cause the observed abnormality.
Cardiac arrest
MedGen UID:
5456
Concept ID:
C0018790
Finding
An abrupt loss of heart function.
Torsades de pointes
MedGen UID:
21214
Concept ID:
C0040479
Disease or Syndrome
A type of ventricular tachycardia characterized by polymorphioc QRS complexes that change in amplitue and cycle length, and thus have the appearance of oscillating around the baseline in the EKG.
Ventricular fibrillation
MedGen UID:
21844
Concept ID:
C0042510
Disease or Syndrome
Uncontrolled contractions of muscles fibers in the left ventricle not producing contraction of the left ventricle. Ventricular fibrillation usually begins with a ventricular premature contraction and a short run of rapid ventricular tachycardia degenerating into uncoordinating ventricular fibrillations.
Ventricular tachycardia
MedGen UID:
12068
Concept ID:
C0042514
Finding
A tachycardia originating in the ventricles characterized by rapid heart rate (over 100 beats per minute) and broad QRS complexes (over 120 ms).
Prolonged QTc interval
MedGen UID:
294666
Concept ID:
C1560305
Pathologic Function
A longer than normal interval (corrected for heart rate) between the Q and T waves in the heart's cycle. Prolonged QTc can cause premature action potentials during late phase depolarizations thereby leading to ventricular arrhythmias and ventricular fibrillations.
Oral-pharyngeal dysphagia
MedGen UID:
120596
Concept ID:
C0267071
Disease or Syndrome
Difficulty in swallowing due to an abnormality in the mouth or throat.
Sensorineural hearing loss disorder
MedGen UID:
9164
Concept ID:
C0018784
Disease or Syndrome
A type of hearing impairment in one or both ears related to an abnormal functionality of the cochlear nerve.
Cerebellar ataxia
MedGen UID:
849
Concept ID:
C0007758
Disease or Syndrome
Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).
Clonus
MedGen UID:
40341
Concept ID:
C0009024
Sign or Symptom
A series of rhythmic and involuntary muscle contractions (at a frequency of about 5 to 7 Hz) that occur in response to an abruptly applied and sustained stretch.
Dysarthria
MedGen UID:
8510
Concept ID:
C0013362
Mental or Behavioral Dysfunction
Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.
Dystonic disorder
MedGen UID:
3940
Concept ID:
C0013421
Sign or Symptom
An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk.
Spastic diplegia
MedGen UID:
44181
Concept ID:
C0023882
Disease or Syndrome
Spasticity (neuromuscular hypertonia) primarily in the muscles of the legs, hips, and pelvis.
Neurodegeneration
MedGen UID:
17999
Concept ID:
C0027746
Cell or Molecular Dysfunction
Progressive loss of neural cells and tissue.
Seizure
MedGen UID:
20693
Concept ID:
C0036572
Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterised by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Cerebral atrophy
MedGen UID:
116012
Concept ID:
C0235946
Disease or Syndrome
Atrophy (wasting, decrease in size of cells or tissue) affecting the cerebrum.
Spastic tetraplegia
MedGen UID:
98433
Concept ID:
C0426970
Disease or Syndrome
Spastic paralysis affecting all four limbs.
Global developmental delay
MedGen UID:
107838
Concept ID:
C0557874
Finding
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.
Poor coordination
MedGen UID:
107874
Concept ID:
C0563243
Finding
Gait disturbance
MedGen UID:
107895
Concept ID:
C0575081
Finding
The term gait disturbance can refer to any disruption of the ability to walk. In general, this can refer to neurological diseases but also fractures or other sources of pain that is triggered upon walking. However, in the current context gait disturbance refers to difficulty walking on the basis of a neurological or muscular disease.
Gait ataxia
MedGen UID:
155642
Concept ID:
C0751837
Sign or Symptom
A type of ataxia characterized by the impairment of the ability to coordinate the movements required for normal walking. Gait ataxia is characteirzed by a wide-based staggering gait with a tendency to fall.
Hyperactive deep tendon reflexes
MedGen UID:
335355
Concept ID:
C1846176
Finding
Absent speech
MedGen UID:
340737
Concept ID:
C1854882
Finding
Complete lack of development of speech and language abilities.
Intellectual disability
MedGen UID:
811461
Concept ID:
C3714756
Mental or Behavioral Dysfunction
Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.
Rhabdomyolysis
MedGen UID:
19775
Concept ID:
C0035410
Pathologic Function
Breakdown of muscle fibers that leads to the release of muscle fiber contents (myoglobin) into the bloodstream.
Muscle weakness
MedGen UID:
57735
Concept ID:
C0151786
Finding
Reduced strength of muscles.
Generalized hypotonia
MedGen UID:
346841
Concept ID:
C1858120
Finding
Generalized muscular hypotonia (abnormally low muscle tone).
Acute rhabdomyolysis
MedGen UID:
813636
Concept ID:
C3807306
Finding
An acute form of rhabdomyolysis.
Microcephaly
MedGen UID:
1644158
Concept ID:
C4551563
Finding
Head circumference below 2 standard deviations below the mean for age and gender.
Lactic acidosis
MedGen UID:
1717
Concept ID:
C0001125
Disease or Syndrome
An abnormal buildup of lactic acid in the body, leading to acidification of the blood and other bodily fluids.
Hypoglycemia
MedGen UID:
6979
Concept ID:
C0020615
Disease or Syndrome
A decreased concentration of glucose in the blood.
Metabolic acidosis
MedGen UID:
65117
Concept ID:
C0220981
Pathologic Function
Metabolic acidosis (MA) is characterized by a fall in blood pH due to a reduction of serum bicarbonate concentration. This can occur as a result of either the accumulation of acids (high anion gap MA) or the loss of bicarbonate from the gastrointestinal tract or the kidney (hyperchloremic MA). By definition, MA is not due to a respirary cause.
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.
Elevated hepatic transaminase
MedGen UID:
338525
Concept ID:
C1848701
Finding
Elevations of the levels of SGOT and SGPT in the serum. SGOT (serum glutamic oxaloacetic transaminase) and SGPT (serum glutamic pyruvic transaminase) are transaminases primarily found in the liver and heart and are released into the bloodstream as the result of liver or heart damage. SGOT and SGPT are used clinically mainly as markers of liver damage.
Elevated circulating acylcarnitine concentration
MedGen UID:
892855
Concept ID:
C4073171
Finding
Concentration of acylcarnitine in the blood circulation above the upper limit of normal.
Hyperammonemia
MedGen UID:
1802066
Concept ID:
C5574662
Laboratory or Test Result
An increased concentration of ammonia in the blood.
Drooling
MedGen UID:
8484
Concept ID:
C0013132
Finding
Habitual flow of saliva out of the mouth.
Myopathic facies
MedGen UID:
90695
Concept ID:
C0332615
Finding
A facial appearance characteristic of myopathic conditions. The face appears expressionless with sunken cheeks, bilateral ptosis, and inability to elevate the corners of the mouth, due to muscle weakness.
Hypothyroidism
MedGen UID:
6991
Concept ID:
C0020676
Disease or Syndrome
Deficiency of thyroid hormone.
Premature pubarche
MedGen UID:
575093
Concept ID:
C0342541
Disease or Syndrome
The onset of growth of pubic hair at an earlier age than normal.
Premature thelarche
MedGen UID:
98416
Concept ID:
C0425772
Finding
Premature development of the breasts.
Optic atrophy
MedGen UID:
18180
Concept ID:
C0029124
Disease or Syndrome
Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVRecurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome

Recent clinical studies

Etiology

Hussain SI, Muhammad N, Khan N, Khan M, Fardous F, Tahir R, Yasin M, Khan SA, Saleha S, Muhammad N, Wasif N, Khan S
J Gene Med 2024 Jan;26(1):e3591. Epub 2023 Sep 18 doi: 10.1002/jgm.3591. PMID: 37721116

Diagnosis

Hussain SI, Muhammad N, Khan N, Khan M, Fardous F, Tahir R, Yasin M, Khan SA, Saleha S, Muhammad N, Wasif N, Khan S
J Gene Med 2024 Jan;26(1):e3591. Epub 2023 Sep 18 doi: 10.1002/jgm.3591. PMID: 37721116

Clinical prediction guides

Hussain SI, Muhammad N, Khan N, Khan M, Fardous F, Tahir R, Yasin M, Khan SA, Saleha S, Muhammad N, Wasif N, Khan S
J Gene Med 2024 Jan;26(1):e3591. Epub 2023 Sep 18 doi: 10.1002/jgm.3591. PMID: 37721116

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