Leukoencephalopathy with thalamus and brainstem involvement and high lactate
अंतिम अद्यतन 10 नवम्बर 2023
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Leukoencephalopathy with thalamus and brainstem involvement and high lactate (LTBL) is a disorder that affects the brain. LTBL is one of a group of genetic disorders called leukodystrophies, which feature abnormalities of the nervous system's white matter. White matter consists of nerve fibers covered by a fatty substance, called myelin, that insulates nerve fibers and promotes the rapid transmission of nerve impulses.
विवरण
Leukoencephalopathy with thalamus and brainstem involvement and high lactate (LTBL) is a disorder that affects the brain. LTBL is one of a group of genetic disorders called leukodystrophies, which feature abnormalities of the nervous system's white matter. White matter consists of nerve fibers covered by a fatty substance, called myelin, that insulates nerve fibers and promotes the rapid transmission of nerve impulses.
LTBL is characterised by distinct changes in the brain, which can be seen using magnetic resonance imaging (MRI). These abnormalities typically involve white matter in regions of the brain known as the cerebrum and cerebellum. Abnormalities can also be seen in other regions of the brain, including the brainstem, which is the part that connects to the spinal cord. Affected brain regions include the thalamus, midbrain, pons, and medulla oblongata. Thinning of the tissue that connects the left and right halves of the brain (the corpus callosum) also occurs in people with LTBL. In addition, most affected individuals have a high level of a substance called lactate in the brain and elsewhere in the body.
The severity of the condition varies. Mildly affected individuals usually develop signs and symptoms after the age of 6 months. Loss of mental and movement abilities (psychomotor regression), muscle stiffness (spasticity), and extreme irritability are common, and some people with mild LTBL develop seizures. However, after age 2, the signs and symptoms of the condition improve: affected children regain some psychomotor abilities, seizures are reduced or disappear, MRI results become more normal, and lactate levels drop.
Severely affected individuals have features that begin soon after birth. These infants typically have delayed development of mental and movement abilities (psychomotor delay), weak muscle tone (hypotonia), involuntary muscle tensing (dystonia), muscle spasticity, and seizures. Some have extremely high levels of lactate (lactic acidosis), which can cause serious breathing problems and an abnormal heartbeat. Liver failure occurs in some severely affected infants. In severe cases, the signs and symptoms do not improve and can be life-threatening. In some people with LTBL, the features fall between mild and severe.
Inheritance patterns
The source lists the following possible inheritance patterns: Autosomal recessive. More than one pattern can apply in different cases.
Related genes
Other names
Combined oxidative phosphorylation deficiency 12
COXPD12
LTBL
Related patient information and medicines
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अधिक पठन और संदर्भ
- Leukoencephalopathy with thalamus and brainstem involvement and high lactate; MedlinePlus, National Library of Medicine.
- Biancheri R, Lamantea E, Severino M, Diodato D, Pedemonte M, Cassandrini D, Ploederl A, Trucco F, Fiorillo C, Minetti C, Santorelli FM, Zeviani M, Bruno C. Expanding the Clinical and Magnetic Resonance Spectrum of Leukoencephalopathy with Thalamus and Brainstem Involvement and High Lactate (LTBL) in a Patient Harboring a Novel EARS2 Mutation. JIMD Rep. 2015;23:85-9. doi: 10.1007/8904_2015_434. Epub 2015 Apr 9.
- Danhauser K, Haack TB, Alhaddad B, Melcher M, Seibt A, Strom TM, Meitinger T, Klee D, Mayatepek E, Prokisch H, Distelmaier F. EARS2 mutations cause fatal neonatal lactic acidosis, recurrent hypoglycemia and agenesis of corpus callosum. Metab Brain Dis. 2016 Jun;31(3):717-21. doi: 10.1007/s11011-016-9793-2. Epub 2016 Jan 16.
- Kevelam SH, Klouwer FC, Fock JM, Salomons GS, Bugiani M, van der Knaap MS. Absent Thalami Caused by a Homozygous EARS2 Mutation: Expanding Disease Spectrum of LTBL. Neuropediatrics. 2016 Jan;47(1):64-7. doi: 10.1055/s-0035-1568987. Epub 2015 Nov 30.
- Steenweg ME, Ghezzi D, Haack T, Abbink TE, Martinelli D, van Berkel CG, Bley A, Diogo L, Grillo E, Te Water Naude J, Strom TM, Bertini E, Prokisch H, van der Knaap MS, Zeviani M. Leukoencephalopathy with thalamus and brainstem involvement and high lactate 'LTBL' caused by EARS2 mutations. Brain. 2012 May;135(Pt 5):1387-94. doi: 10.1093/brain/aws070. Epub 2012 Apr 4.
- Taskin BD, Karalok ZS, Gurkas E, Aydin K, Aydogmus U, Ceylaner S, Karaer K, Yilmaz C, Pearl PL. Early-Onset Mild Type Leukoencephalopathy Caused by a Homozygous EARS2 Mutation. J Child Neurol. 2016 Jun;31(7):938-41. doi: 10.1177/0883073816630087. Epub 2016 Feb 18.
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