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==Overview== | ==Overview== | ||
'''Leigh's disease''', a form of '''Leigh syndrome''', also known as '''Subacute Necrotizing Encephalomyelopathy (SNEM)''', is a rare, inherited neurodegenerative disorder that mainly affects the central nervous system and becomes apparent during infancy, often after a viral illness. There is progressive loss of mental and movement abilities (psychomotor regression) and often leads to death within 2-3 years, usually due to respiratory failure. | '''Leigh's disease''', a form of '''Leigh syndrome''', also known as '''Subacute Necrotizing Encephalomyelopathy (SNEM)''', is a rare, inherited [[Neurodegenerative disease|neurodegenerative]] disorder that mainly affects the [[Nervous system disease|central nervous system]] and becomes apparent during [[infancy]], often after a [[viral]] [[illness]]. There is progressive loss of [[mental]] and movement abilities ([[Psychomotor retardation|psychomotor]] [[regression]]) and often leads to death within 2-3 years, usually due to [[Respiratory system|respiratory]] [[failure]]. | ||
==Historical Perspective== | ==Historical Perspective== | ||
Leigh's Syndrome was first described by Archibald Denis Leigh, a British neuropsychiatrist, in 1951. | Leigh's Syndrome was first described by Archibald Denis Leigh, a British [[neuropsychiatrist]], in 1951. <ref name="pmid14874135">{{cite journal| author=LEIGH D| title=Subacute necrotizing encephalomyelopathy in an infant. | journal=J Neurol Neurosurg Psychiatry | year= 1951 | volume= 14 | issue= 3 | pages= 216-21 | pmid=14874135 | doi=10.1136/jnnp.14.3.216 | pmc=499520 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14874135 }} </ref> | ||
==Pathophysiology== | |||
It is thought that manifestation of Leigh's syndrome is caused by [[brain]] [[lesion]] at different parts including [[Brain stem|brainstem]], [[Basal Ganglia|basal]] [[ganglia]], [[cerebellum]], and other regions of the [[brain]]. [[Brain]] lesions may be present in different forms such as [[demyelination]], [[gliosis]], [[spongiosis]], [[necrosis]] and [[capillary]] proliferation. Due to [[demyelination]], [[neurons]] in [[brain]] loses their ability to communicate with other [[neurons]] which hampers basic life functions, [[movements]] and [[Balance disorder|balance]]. [[Lactic acidosis]] may be observed in some patients with [[pyruvate]] buildup, due to defective [[oxidative phosphorylation]]. <ref name="pmid23772060">{{cite journal| author=Baertling F, Rodenburg RJ, Schaper J, Smeitink JA, Koopman WJ, Mayatepek E | display-authors=etal| title=A guide to diagnosis and treatment of Leigh syndrome. | journal=J Neurol Neurosurg Psychiatry | year= 2014 | volume= 85 | issue= 3 | pages= 257-65 | pmid=23772060 | doi=10.1136/jnnp-2012-304426 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23772060 }} </ref> | |||
==Causes== | ==Causes== | ||
Leigh's syndrome may be caused by [[mutations]] of any of 30 different [[genes]], present in [[nuclear]] [[DNA]]. The most common cause of Leigh's syndrome is mutations in a gene called [[SURF1]] (surfeit1) among [[nuclear DNA]] genes. Around 20 % of the cases are found to be due to mutation in [[mitochondrial DNA]]. Among [[mitochondrial DNA]] genes, [[mutations]] in [[MT-ATP6 gene]], that codes for [[ATP synthase]] is most common cause known to cause the [[disease]]. <ref> 1. Leigh syndrome: MedlinePlus Genetics [Internet]. [cited 2021 Jul 30]. Available from: https://medlineplus.gov/genetics/condition/leigh-syndrome/ </ref> | |||
==Epidemiology and Demographics== | |||
The [[prevalence]] of Leigh's Syndrome is approximately 1 per 40,000 [[live births]] individuals worldwide.<ref> 1. Leigh syndrome: MedlinePlus Genetics [Internet]. [cited 2021 Jul 30]. Available from: https://medlineplus.gov/genetics/condition/leigh-syndrome/ </ref> | |||
== | ==Risk Factors== | ||
There are no established [[risk factors]] for Leigh's disease. | |||
==Screening== | |||
There is insufficient evidence to recommend routine screening for Leigh's disease. | |||
==Natural History, Complications, and Prognosis== | |||
[[Life expectancy]] for [[children]] diagnosed with Leigh's disease usually exceeds no more than two or three years. <ref name="pmid24731534">{{cite journal| author=Sofou K, De Coo IF, Isohanni P, Ostergaard E, Naess K, De Meirleir L | display-authors=etal| title=A multicenter study on Leigh syndrome: disease course and predictors of survival. | journal=Orphanet J Rare Dis | year= 2014 | volume= 9 | issue= | pages= 52 | pmid=24731534 | doi=10.1186/1750-1172-9-52 | pmc=4021638 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24731534 }} </ref> | |||
==Differential diagnosis== | ==Differential diagnosis== | ||
Leigh's disease must be differentiated from other | Leigh's disease must be differentiated from other [[diseases]] that cause [[Neurological disorders|neurological]] manifestations in [[infants]]. | ||
[[Leigh's disease]] must be differentiated from [[birth asphyxia]], [[kernicterus]], [[encephalitis]], [[Thiamine deficiency|thiamine]] deficiency, [[Wilson's disease|Wilson's]] disease, biotin-responsive [[basal ganglia disease]]. [[Perinatal asphyxia|Birth asphyxia]] and [[hyperbilirubinemia]] can cause damage to [[thalamus]] and [[basal ganglia]], which can cause [[Lesion|lesions]] similar to leigh's disease. <ref name="pmid23772060">{{cite journal| author=Baertling F, Rodenburg RJ, Schaper J, Smeitink JA, Koopman WJ, Mayatepek E | display-authors=etal| title=A guide to diagnosis and treatment of Leigh syndrome. | journal=J Neurol Neurosurg Psychiatry | year= 2014 | volume= 85 | issue= 3 | pages= 257-65 | pmid=23772060 | doi=10.1136/jnnp-2012-304426 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23772060 }} </ref> | |||
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==Diagnosis== | |||
The [[diagnosis]] of Leigh's syndrome is suggested based on the [[clinical]] findings, confirmed through [[laboratory]] and [[genetic testing]]. | |||
===Diagnostic study of Choice=== | |||
Magnetic resonance imaging ([[MRI]]) of the brain may reveal abnormal areas in certain parts of the [[brain]] including [[basal ganglia]], [[brain stem]], and [[grey matter]]. | |||
Finding in MRI suggestive of Leigh's disease includes hyperintense signal abnormalities on T2-weighted magnetic resonance imaging (MRI).<ref name="pmid26739140">{{cite journal| author=Bonfante E, Koenig MK, Adejumo RB, Perinjelil V, Riascos RF| title=The neuroimaging of Leigh syndrome: case series and review of the literature. | journal=Pediatr Radiol | year= 2016 | volume= 46 | issue= 4 | pages= 443-51 | pmid=26739140 | doi=10.1007/s00247-015-3523-5 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26739140 }} </ref> | |||
===History and Symptoms=== | |||
[[Symptoms]] began to appear from [[infancy]] that begins with [[vomiting]], [[diarrhoea]], and [[Poor growth|poor]] sucking that leads to [[failure to thrive]]. On progressive note, [[muscular system]] involved leading to [[hypotonia]] (decrease [[Tone (linguistics)|tone]]), [[dystonia]] (sustained [[spasm]]) and [[ataxia]] (loss of control over movements). Muscles that controls [[eye movement]] get affected leading to [[ophthalmoparesis]] and [[nystagmus]] ([[Involuntary muscle|involuntary]] eye movement). [[Lungs]] and [[heart]] can be involved leading to [[hypertrophic cardiomyopathy]] and [[respiratory failure]], most common cause of death. [[Peripheral neuropathy]] have been noted in some cases of Leigh's syndrome. [[Hypertrichosis]] can be seen in some patient due SURF1 [[Nuclear DNA|nuclear]] gene [[mutation]]. | |||
<ref name="pmid23772060">{{cite journal| author=Baertling F, Rodenburg RJ, Schaper J, Smeitink JA, Koopman WJ, Mayatepek E | display-authors=etal| title=A guide to diagnosis and treatment of Leigh syndrome. | journal=J Neurol Neurosurg Psychiatry | year= 2014 | volume= 85 | issue= 3 | pages= 257-65 | pmid=23772060 | doi=10.1136/jnnp-2012-304426 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23772060 }} </ref> | |||
===Physical Examinations=== | |||
Common physical examination findings of Leigh's disease include [[dystonia]], [[nystagmus]], [[autonomic dysfunction]] (due to damage to [[basal ganglia]] and [[brain stem]]). | |||
===Laboratory Findings=== | |||
Laboratory findings consistent with the [[diagnosis]] of [[Leigh's syndrome]] include high levels of [[acidic]] waste products in the [[blood]] ([[lactic acidosis]]) as well as elevated levels of [[pyruvate]] and [[alanine]]. | |||
===Echocardiogram=== | |||
There are no [[ECG]] findings associated with Leigh's disease. | |||
===X-ray=== | |||
There are no [[X-rays|x-ray]] findings associated with Leigh's disease. | |||
===Echocardiography or Ultrasound=== | |||
[[Echocardiography]] may be helpful in the diagnosis of Leigh's disease. Findings on an echocardiography suggestive of Leigh's disease includes [[cardiomyopathy]] and [[Pericardial effusion.|pericardial effusion. <ref name="pmid20502985">{{cite journal| author=Hadzsiev K, Maasz A, Kisfali P, Kalman E, Gomori E, Pal E | display-authors=etal| title=Mitochondrial DNA 11777C>A mutation associated Leigh syndrome: case report with a review of the previously described pedigrees. | journal=Neuromolecular Med | year= 2010 | volume= 12 | issue= 3 | pages= 277-84 | pmid=20502985 | doi=10.1007/s12017-010-8115-9 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20502985 }} </ref>]] | |||
===CT Scan=== | |||
A [[Head]] [[Computed tomography|CT]] scan may be helpful in the diagnosis of Leigh's disease. Findings on CT scan suggestive of Leigh's disease include bilateral symmetric subcortical hypodensities. <ref name="pmid26739140">{{cite journal| author=Bonfante E, Koenig MK, Adejumo RB, Perinjelil V, Riascos RF| title=The neuroimaging of Leigh syndrome: case series and review of the literature. | journal=Pediatr Radiol | year= 2016 | volume= 46 | issue= 4 | pages= 443-51 | pmid=26739140 | doi=10.1007/s00247-015-3523-5 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26739140 }} </ref> | |||
==Treatment== | ==Treatment== | ||
There is no treatment for [[Leigh's disease]]; the mainstay of therapy is supportive care. [[Anticonvulsant|Anti-epileptic drugs]] can be used to manage patient who present with [[epilepsy]]. In addition, [[coenzyme Q10]], [[thiamine]] and [[biotin]] can be used to [[Supplements|supplement]] [[deficiencies]]. <ref name="pmid22513923">{{cite journal| author=Pfeffer G, Majamaa K, Turnbull DM, Thorburn D, Chinnery PF| title=Treatment for mitochondrial disorders. | journal=Cochrane Database Syst Rev | year= 2012 | volume= | issue= 4 | pages= CD004426 | pmid=22513923 | doi=10.1002/14651858.CD004426.pub3 | pmc=7201312 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22513923 }} </ref> | |||
==References== | ==References== | ||
Latest revision as of 11:31, 18 August 2021
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Leigh's disease, a form of Leigh syndrome, also known as Subacute Necrotizing Encephalomyelopathy (SNEM), is a rare, inherited neurodegenerative disorder that mainly affects the central nervous system and becomes apparent during infancy, often after a viral illness. There is progressive loss of mental and movement abilities (psychomotor regression) and often leads to death within 2-3 years, usually due to respiratory failure.
Historical Perspective
Leigh's Syndrome was first described by Archibald Denis Leigh, a British neuropsychiatrist, in 1951. [1]
Pathophysiology
It is thought that manifestation of Leigh's syndrome is caused by brain lesion at different parts including brainstem, basal ganglia, cerebellum, and other regions of the brain. Brain lesions may be present in different forms such as demyelination, gliosis, spongiosis, necrosis and capillary proliferation. Due to demyelination, neurons in brain loses their ability to communicate with other neurons which hampers basic life functions, movements and balance. Lactic acidosis may be observed in some patients with pyruvate buildup, due to defective oxidative phosphorylation. [2]
Causes
Leigh's syndrome may be caused by mutations of any of 30 different genes, present in nuclear DNA. The most common cause of Leigh's syndrome is mutations in a gene called SURF1 (surfeit1) among nuclear DNA genes. Around 20 % of the cases are found to be due to mutation in mitochondrial DNA. Among mitochondrial DNA genes, mutations in MT-ATP6 gene, that codes for ATP synthase is most common cause known to cause the disease. [3]
Epidemiology and Demographics
The prevalence of Leigh's Syndrome is approximately 1 per 40,000 live births individuals worldwide.[4]
Risk Factors
There are no established risk factors for Leigh's disease.
Screening
There is insufficient evidence to recommend routine screening for Leigh's disease.
Natural History, Complications, and Prognosis
Life expectancy for children diagnosed with Leigh's disease usually exceeds no more than two or three years. [5]
Differential diagnosis
Leigh's disease must be differentiated from other diseases that cause neurological manifestations in infants. Leigh's disease must be differentiated from birth asphyxia, kernicterus, encephalitis, thiamine deficiency, Wilson's disease, biotin-responsive basal ganglia disease. Birth asphyxia and hyperbilirubinemia can cause damage to thalamus and basal ganglia, which can cause lesions similar to leigh's disease. [2]
Diagnosis
The diagnosis of Leigh's syndrome is suggested based on the clinical findings, confirmed through laboratory and genetic testing.
Diagnostic study of Choice
Magnetic resonance imaging (MRI) of the brain may reveal abnormal areas in certain parts of the brain including basal ganglia, brain stem, and grey matter. Finding in MRI suggestive of Leigh's disease includes hyperintense signal abnormalities on T2-weighted magnetic resonance imaging (MRI).[6]
History and Symptoms
Symptoms began to appear from infancy that begins with vomiting, diarrhoea, and poor sucking that leads to failure to thrive. On progressive note, muscular system involved leading to hypotonia (decrease tone), dystonia (sustained spasm) and ataxia (loss of control over movements). Muscles that controls eye movement get affected leading to ophthalmoparesis and nystagmus (involuntary eye movement). Lungs and heart can be involved leading to hypertrophic cardiomyopathy and respiratory failure, most common cause of death. Peripheral neuropathy have been noted in some cases of Leigh's syndrome. Hypertrichosis can be seen in some patient due SURF1 nuclear gene mutation. [2]
Physical Examinations
Common physical examination findings of Leigh's disease include dystonia, nystagmus, autonomic dysfunction (due to damage to basal ganglia and brain stem).
Laboratory Findings
Laboratory findings consistent with the diagnosis of Leigh's syndrome include high levels of acidic waste products in the blood (lactic acidosis) as well as elevated levels of pyruvate and alanine.
Echocardiogram
There are no ECG findings associated with Leigh's disease.
X-ray
There are no x-ray findings associated with Leigh's disease.
Echocardiography or Ultrasound
Echocardiography may be helpful in the diagnosis of Leigh's disease. Findings on an echocardiography suggestive of Leigh's disease includes cardiomyopathy and pericardial effusion. [7]
CT Scan
A Head CT scan may be helpful in the diagnosis of Leigh's disease. Findings on CT scan suggestive of Leigh's disease include bilateral symmetric subcortical hypodensities. [6]
Treatment
There is no treatment for Leigh's disease; the mainstay of therapy is supportive care. Anti-epileptic drugs can be used to manage patient who present with epilepsy. In addition, coenzyme Q10, thiamine and biotin can be used to supplement deficiencies. [8]
References
- ↑ LEIGH D (1951). "Subacute necrotizing encephalomyelopathy in an infant". J Neurol Neurosurg Psychiatry. 14 (3): 216–21. doi:10.1136/jnnp.14.3.216. PMC 499520. PMID 14874135.
- ↑ 2.0 2.1 2.2 Baertling F, Rodenburg RJ, Schaper J, Smeitink JA, Koopman WJ, Mayatepek E; et al. (2014). "A guide to diagnosis and treatment of Leigh syndrome". J Neurol Neurosurg Psychiatry. 85 (3): 257–65. doi:10.1136/jnnp-2012-304426. PMID 23772060.
- ↑ 1. Leigh syndrome: MedlinePlus Genetics [Internet]. [cited 2021 Jul 30]. Available from: https://medlineplus.gov/genetics/condition/leigh-syndrome/
- ↑ 1. Leigh syndrome: MedlinePlus Genetics [Internet]. [cited 2021 Jul 30]. Available from: https://medlineplus.gov/genetics/condition/leigh-syndrome/
- ↑ Sofou K, De Coo IF, Isohanni P, Ostergaard E, Naess K, De Meirleir L; et al. (2014). "A multicenter study on Leigh syndrome: disease course and predictors of survival". Orphanet J Rare Dis. 9: 52. doi:10.1186/1750-1172-9-52. PMC 4021638. PMID 24731534.
- ↑ 6.0 6.1 Bonfante E, Koenig MK, Adejumo RB, Perinjelil V, Riascos RF (2016). "The neuroimaging of Leigh syndrome: case series and review of the literature". Pediatr Radiol. 46 (4): 443–51. doi:10.1007/s00247-015-3523-5. PMID 26739140.
- ↑ Hadzsiev K, Maasz A, Kisfali P, Kalman E, Gomori E, Pal E; et al. (2010). "Mitochondrial DNA 11777C>A mutation associated Leigh syndrome: case report with a review of the previously described pedigrees". Neuromolecular Med. 12 (3): 277–84. doi:10.1007/s12017-010-8115-9. PMID 20502985.
- ↑ Pfeffer G, Majamaa K, Turnbull DM, Thorburn D, Chinnery PF (2012). "Treatment for mitochondrial disorders". Cochrane Database Syst Rev (4): CD004426. doi:10.1002/14651858.CD004426.pub3. PMC 7201312 Check
|pmc=value (help). PMID 22513923.
Template:Diseases of the nervous system Template:Mitochondrial diseases