Pelizaeus-Merzbacher-Like Disease Type 1

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This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/pelizaeus-merzbacher-like-disease-type-1

Pelizaeus-Merzbacher-like disease type 1 is an inherited condition involving the brain and spinal cord (central nervous system).

genetic conditions

1. Introduction

This disease is one of a group of genetic disorders called leukodystrophies. Leukodystrophies are abnormalities of the nervous system's white matter, which consists of nerve fibers covered by a fatty substance called myelin. Myelin insulates nerve fibers and promotes the rapid transmission of nerve impulses. In particular, Pelizaeus-Merzbacher-like disease type 1 involves hypomyelination, which means that the nervous system has a reduced ability to form myelin. The signs and symptoms of this condition are very similar to another leukodystrophy called Pelizaeus-Merzbacher disease, but the two disorders have different genetic causes.

Beginning in the first few months of life, infants with Pelizaeus-Merzbacher-like disease type 1 typically experience weak muscle tone (hypotonia), involuntary movements of the eyes (nystagmus), and delayed development of speech and motor skills, such as sitting or grasping objects. As children with Pelizaeus-Merzbacher-like disease type 1 get older, hypotonia changes to muscle stiffness (spasticity).

During childhood, individuals with Pelizaeus-Merzbacher-like disease type 1 develop problems with movement and balance (ataxia), difficulty with movements that involve judging distance or scale (dysmetria), tremors that occur mainly during movement (intention tremors), and head and neck tremors (titubation). People with this condition have an inability to perform quick, alternating movements (dysdiadochokinesia), such as quickly tapping different fingers. Some develop involuntary tensing of the muscles (dystonia) and jerking (choreiform) movements. Many people with Pelizaeus-Merzbacher-like disease type 1 develop skeletal issues such as an abnormal curvature of the spine (scoliosis) and require wheelchair assistance from childhood.

Muscle abnormalities can lead to difficulty swallowing and problems producing speech (expressive language), but affected individuals can understand speech (receptive language). Most individuals with Pelizaeus-Merzbacher-like disease type 1 have normal intelligence. Rarely, hearing loss, optic atrophy, and recurrent seizures (epilepsy) can occur.

2. Frequency

The prevalence of Pelizaeus-Merzbacher-like disease type 1 is unknown, but it is thought to be rare.

3. Causes

Pelizaeus-Merzbacher-like disease type 1 is caused by mutations in the GJC2 gene. This gene provides instructions for making a protein called connexin-47. This protein plays a role in forming channels called gap junctions between cells. Gap junctions made with connexin-47 facilitate communication between nervous system cells called oligodendrocytes or between oligodendrocytes and another type of nervous system cell called astrocytes. Communication between these cells is necessary for the formation of myelin.

GJC2 gene mutations that cause Pelizaeus-Merzbacher-like disease type 1 reduce the production of connexin-47, prevent the connexin-47 protein from reaching the cell membrane, or decrease the function of the protein in the gap junction. All of these GJC2 gene mutations disrupt the communication between nerve cells that normally occurs at gap junctions and impair myelin formation. These changes lead to nerve damage in the brain and spinal cord that impairs nervous system function, resulting in the signs and symptoms of Pelizaeus-Merzbacher-like disease type 1.

4. Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

5. Other Names for This Condition

HLD2
hypomyelinating leukodystrophy 2
Pelizaeus Merzbacher like disease
Pelizaeus-Merzbacher-like disease
PMLD - Pelizaeus Merzbacher like disease
PMLD1

References

Hobson GM, Garbern JY. Pelizaeus-Merzbacher disease, Pelizaeus-Merzbacher-likedisease 1, and related hypomyelinating disorders. Semin Neurol. 2012Feb;32(1):62-7. doi: 10.1055/s-0032-1306388.
Ji H, Li D, Wu Y, Zhang Q, Gu Q, Xie H, Ji T, Wang H, Zhao L, Zhao H, Yang Y, Feng H, Xiong H, Ji J, Yang Z, Kou L, Li M, Bao X, Chang X, Zhang Y, Li L, Li H, Niu Z, Wu X, Xiao J, Jiang Y, Wang J. Hypomyelinating disorders in China: Theclinical and genetic heterogeneity in 119 patients. PLoS One. 2018 Feb16;13(2):e0188869. doi: 10.1371/journal.pone.0188869.
Nahhas N, Conant A, Orthmann-Murphy J, Vanderver A, Hobson G.Pelizaeus-Merzbacher-Like Disease 1. 2017 Dec 21 [updated 2019 Jan 17]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, Stephens K, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle;1993-2020. Available from http://www.ncbi.nlm.nih.gov/books/NBK470716/
Orthmann-Murphy JL, Freidin M, Fischer E, Scherer SS, Abrams CK. Two distinct heterotypic channels mediate gap junction coupling between astrocyte andoligodendrocyte connexins. J Neurosci. 2007 Dec 19;27(51):13949-57.
Osaka H, Hamanoue H, Yamamoto R, Nezu A, Sasaki M, Saitsu H, Kurosawa K,Shimbo H, Matsumoto N, Inoue K. Disrupted SOX10 regulation of GJC2 transcription causes Pelizaeus-Merzbacher-like disease. Ann Neurol. 2010 Aug;68(2):250-4. doi: 10.1002/ana.22022.

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Subjects: Genetics & Heredity

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Rita Xu

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Update Date: 24 Dec 2020

Table of Contents

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1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

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1. Introduction

2. Frequency

3. Causes

The Gene Associated with Pelizaeus-Merzbacher-Like Disease Type 1

4. Inheritance

5. Other Names for This Condition

References