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Multiple mitochondrial dysfunctions syndrome 1(MMDS1)

MedGen UID:
478062
Concept ID:
C3276432
Disease or Syndrome
Synonym: MMDS1
SNOMED CT: MMDS1 - multiple mitochondrial dysfunctions syndrome type 1 (1208485009); Multiple mitochondrial dysfunctions syndrome type 1 (1208485009); NFU1 (NFU1 iron-sulfur cluster scaffold) deficiency (1208485009)
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): NFU1 (2p13.3)
 
Monarch Initiative: MONDO:0011582
OMIM®: 605711
Orphanet: ORPHA401869

Definition

Multiple mitochondrial dysfunctions syndrome is a severe autosomal recessive disorder of systemic energy metabolism, resulting in weakness, respiratory failure, lack of neurologic development, lactic acidosis, and early death (summary by Seyda et al., 2001). Genetic Heterogeneity of Multiple Mitochondrial Dysfunctions Syndrome See also MMDS2 (614299), caused by mutation in the BOLA3 gene (613183) on chromosome 2p13; MMDS3 (615330), caused by mutation in the IBA57 gene (615316) on chromosome 1q42; MMDS4 (616370), caused by mutation in the ISCA2 gene (615317) on chromosome 14q24; MMDS5 (617613), caused by mutation in the ISCA1 gene (611006) on chromosome 9q21; MMDS6 (617954), caused by mutation in the PMPCB gene (603131) on chromosome 7q22; and MMDS7 (620423), caused by mutation in the GCSH gene (238330) on chromosome 16q23. [from OMIM]

Additional description

From MedlinePlus Genetics
Multiple mitochondrial dysfunctions syndrome is characterized by impairment of cellular structures called mitochondria, which are the energy-producing centers of cells. While certain mitochondrial disorders are caused by impairment of a single stage of energy production, individuals with multiple mitochondrial dysfunctions syndrome have reduced function of more than one stage. The signs and symptoms of this severe condition begin early in life, and affected individuals usually do not live past infancy.

Affected infants typically have severe brain dysfunction (encephalopathy), which can contribute to weak muscle tone (hypotonia), seizures, and delayed development of mental and movement abilities (psychomotor delay). These infants often have difficulty growing and gaining weight at the expected rate (failure to thrive). Most affected babies have a buildup of a chemical called lactic acid in the body (lactic acidosis), which can be life-threatening. They may also have high levels of a molecule called glycine (hyperglycinemia) or elevated levels of sugar (hyperglycemia) in the blood. Some babies with multiple mitochondrial dysfunctions syndrome have high blood pressure in the blood vessels that connect to the lungs (pulmonary hypertension) or weakening of the heart muscle (cardiomyopathy).  https://medlineplus.gov/genetics/condition/multiple-mitochondrial-dysfunctions-syndrome

Clinical features

From HPO
Hyperglycinuria
MedGen UID:
107456
Concept ID:
C0543541
Disease or Syndrome
The imino acids, proline and hydroxyproline, share a renal tubular reabsorptive mechanism with glycine. Iminoglycinuria (IG; 242600), a benign inborn error of amino acid transport, is also a normal finding in neonates and infants under 6 months of age (Chesney, 2001). Early studies of families with iminoglycinuria suggested genetic complexity, with homozygotes developing IG and heterozygotes manifesting only hyperglycinuria (HG) (summary by Broer et al., 2008). A phenotype of combined glucosuria and glycinuria has been described (see 138070).
Alpha-aminoadipic aciduria
MedGen UID:
860374
Concept ID:
C4011937
Finding
The concentration of alpha-aminoadipic acid in the urine, normalized for urine concentration, is above the upper limit of normal.
Increased urine alpha-ketoglutarate concentration
MedGen UID:
868516
Concept ID:
C4022915
Finding
A greater than normal concentration of 2-oxoglutaric acid in the urine.
Lacticaciduria
MedGen UID:
871116
Concept ID:
C4025585
Finding
An increased concentration of lactic acid in the urine.
Pulmonary arterial hypertension
MedGen UID:
425404
Concept ID:
C2973725
Disease or Syndrome
Pulmonary hypertension is defined mean pulmonary artery pressure of 25mmHg or more and pulmonary capillary wedge pressure of 15mmHg or less when measured by right heart catheterisation at rest and in a supine position.
Failure to thrive
MedGen UID:
746019
Concept ID:
C2315100
Disease or Syndrome
Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.
Feeding difficulties
MedGen UID:
65429
Concept ID:
C0232466
Finding
Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.
Lethargy
MedGen UID:
7310
Concept ID:
C0023380
Sign or Symptom
A state of disinterest, listlessness, and indifference, resulting in difficulty performing simple tasks or concentrating.
Myoclonus
MedGen UID:
10234
Concept ID:
C0027066
Finding
Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.
Opisthotonus
MedGen UID:
56246
Concept ID:
C0151818
Sign or Symptom
Abnormality of extrapyramidal motor function
MedGen UID:
115941
Concept ID:
C0234133
Sign or Symptom
A neurological condition related to lesions of the basal ganglia leading to typical abnormalities including akinesia (inability to initiate changes in activity and perform volitional movements rapidly and easily), muscular rigidity (continuous contraction of muscles with constant resistance to passive movement), chorea (widespread arrhythmic movements of a forcible, rapid, jerky, and restless nature), athetosis (inability to sustain the muscles of the fingers, toes, or other group of muscles in a fixed position), and akathisia (inability to remain motionless).
Leukoencephalopathy
MedGen UID:
78722
Concept ID:
C0270612
Disease or Syndrome
This term describes abnormality of the white matter of the cerebrum resulting from damage to the myelin sheaths of nerve cells.
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.
Spastic tetraparesis
MedGen UID:
658719
Concept ID:
C0575059
Disease or Syndrome
Spastic weakness affecting all four limbs.
Focal-onset seizure
MedGen UID:
199670
Concept ID:
C0751495
Disease or Syndrome
A focal-onset seizure is a type of seizure originating within networks limited to one hemisphere. They may be discretely localized or more widely distributed, and may originate in subcortical structures.
Increased CSF lactate
MedGen UID:
257904
Concept ID:
C1167918
Finding
Increased concentration of lactate in the cerebrospinal fluid.
Developmental regression
MedGen UID:
324613
Concept ID:
C1836830
Disease or Syndrome
Loss of developmental skills, as manifested by loss of developmental milestones.
Motor regression
MedGen UID:
478627
Concept ID:
C3276997
Finding
Loss of previously achieved motor skills, as manifested by loss of developmental motor milestones.
Increased CSF glycine concentration
MedGen UID:
1691638
Concept ID:
C5139615
Finding
Abnormally increased levels of glycine in cerebrospinal fluid.
Facial paralysis
MedGen UID:
5101
Concept ID:
C0015469
Disease or Syndrome
Complete loss of ability to move facial muscles innervated by the facial nerve (i.e., the seventh cranial nerve).
Muscle weakness
MedGen UID:
57735
Concept ID:
C0151786
Finding
Reduced strength of muscles.
Axial hypotonia
MedGen UID:
342959
Concept ID:
C1853743
Finding
Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.
Respiratory insufficiency
MedGen UID:
11197
Concept ID:
C0035229
Pathologic Function
Impairment of gas exchange within the lungs secondary to a disease process, neoplasm, or trauma, possibly resulting in hypoxia, hypercarbia, or both, but not requiring intubation or mechanical ventilation. Patients are normally managed with pharmaceutical therapy, supplemental oxygen, or both.
Respiratory failure
MedGen UID:
257837
Concept ID:
C1145670
Disease or Syndrome
A severe form of respiratory insufficiency characterized by inadequate gas exchange such that the levels of oxygen or carbon dioxide cannot be maintained within normal limits.
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.
Hyperglycinemia
MedGen UID:
82817
Concept ID:
C0268559
Disease or Syndrome
An elevated concentration of glycine in the blood.
Increased circulating lactate concentration
MedGen UID:
332209
Concept ID:
C1836440
Finding
Abnormally increased level of blood lactate (2-hydroxypropanoic acid). Lactate is produced from pyruvate by lactate dehydrogenase during normal metabolism. The terms lactate and lactic acid are often used interchangeably but lactate (the component measured in blood) is strictly a weak base whereas lactic acid is the corresponding acid. Lactic acidosis is often used clinically to describe elevated lactate but should be reserved for cases where there is a corresponding acidosis (pH below 7.35).
Episodic metabolic acidosis
MedGen UID:
349179
Concept ID:
C1859516
Finding
Repeated transient episodes of metabolic acidosis, that is, of the buildup of acid or depletion of base due to accumulation of metabolic acids.
Elevated circulating 2-hydroxybutyric acid concentration
MedGen UID:
1785289
Concept ID:
C5539578
Finding
Elevation of the 2-hydroxybutyric acid concentration in the blood above the normal range.
Decreased activity of mitochondrial respiratory chain
MedGen UID:
892840
Concept ID:
C4024609
Finding
Decreased activity of the mitochondrial respiratory chain.
Decreased activity of mitochondrial complex II
MedGen UID:
892305
Concept ID:
C4024705
Finding
A reduction in the activity of the mitochondrial respiratory chain complex II, which is part of the electron transport chain in mitochondria.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVMultiple mitochondrial dysfunctions syndrome 1

Recent clinical studies

Diagnosis

Birjiniuk A, Glinton KE, Villafranco N, Boyer S, Laufman J, Mizerik E, Scott D, Elsea SH, Galambos C, Varghese NP, Scaglia F
Am J Med Genet A 2020 Apr;182(4):755-761. Epub 2020 Jan 22 doi: 10.1002/ajmg.a.61491. PMID: 31970900

Prognosis

Birjiniuk A, Glinton KE, Villafranco N, Boyer S, Laufman J, Mizerik E, Scott D, Elsea SH, Galambos C, Varghese NP, Scaglia F
Am J Med Genet A 2020 Apr;182(4):755-761. Epub 2020 Jan 22 doi: 10.1002/ajmg.a.61491. PMID: 31970900

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