scholarly journals Ndrg1-Deficient Mice Exhibit a Progressive Demyelinating Disorder of Peripheral Nerves

2004 ◽  
Vol 24 (9) ◽  
pp. 3949-3956 ◽  
Author(s):  
Tomohiko Okuda ◽  
Yujiro Higashi ◽  
Koichi Kokame ◽  
Chihiro Tanaka ◽  
Hisato Kondoh ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Schwann Cells ◽  
Peripheral Nerves ◽  
Sensory Neuropathy ◽  
Disease Type ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Hind Limbs ◽  
Deficient Mice ◽  
Tooth Disease

ABSTRACT NDRG1 is an intracellular protein that is induced under a number of stress and pathological conditions, and it is thought to be associated with cell growth and differentiation. Recently, human NDRG1 was identified as a gene responsible for hereditary motor and sensory neuropathy-Lom (classified as Charcot-Marie-Tooth disease type 4D), which is characterized by early-onset peripheral neuropathy, leading to severe disability in adulthood. In this study, we generated mice lacking Ndrg1 to analyze its function and elucidate the pathogenesis of Charcot-Marie-Tooth disease type 4D. Histological analysis showed that the sciatic nerve of Ndrg1-deficient mice degenerated with demyelination at about 5 weeks of age. However, myelination of Schwann cells in the sciatic nerve was normal for 2 weeks after birth. Ndrg1-deficient mice showed muscle weakness, especially in the hind limbs, but complicated motor skills were retained. In wild-type mice, NDRG1 was abundantly expressed in the cytoplasm of Schwann cells rather than the myelin sheath. These results indicate that NDRG1 deficiency leads to Schwann cell dysfunction, suggesting that NDRG1 is essential for maintenance of the myelin sheaths in peripheral nerves. These mice will be used for future analyses of the mechanisms of myelin maintenance.

Expression profiling of sciatic nerve in a Charcot-Marie-Tooth disease type 1a mouse model

2005 ◽  
Vol 79 (6) ◽  
pp. 825-835 ◽  
Author(s):  
Anneloor L.M.A. ten Asbroek ◽  
Camiel Verhamme ◽  
Marjon van Groenigen ◽  
Ruud Wolterman ◽  
Maryla M. de Kok-Nazaruk ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Mouse Model ◽  
Expression Profiling ◽  
Disease Type ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Tooth Disease

Quantitative measurement of duplicated DNA as a diagnostic test for Charcot-Marie-Tooth disease type 1a

1993 ◽  
Vol 39 (9) ◽  
pp. 1845-1849 ◽  
Author(s):  
G W Hensels ◽  
E A Janssen ◽  
J E Hoogendijk ◽  
L J Valentijn ◽  
F Baas ◽  
...  
Keyword(s):  
Preliminary Investigation ◽  
Sensory Neuropathy ◽  
Disease Type ◽  
Chromosome 17 ◽  
Hereditary Neuropathy ◽  
Chromosomal Dna ◽  
Gene Encoding ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Tooth Disease

Abstract Charcot-Marie-Tooth disease type 1 (CMT1) is a hereditary motor and sensory neuropathy. The autosomal dominant subtype is often linked with a large duplication on chromosome 17p11.2. The gene encoding the peripheral myelin protein PMP 22 (the critical gene in this subtype of CMT1) is located within this duplication. To detect this duplication in chromosomal DNA from individuals thought to have CMT1, we compared the hybridization signals of two DNA probes within this duplication (VAW412R3a and VAW409R3a) with the signal of a reference probe (E3.9). When duplication was present, the signals from the first two probes increased from 100% (for nonduplicated samples) to 145% and 142%, respectively. The day-to-day variance was 3.7% and 5.1%, respectively. We demonstrated this DNA duplication in 49 of 95 DNA samples from unrelated individuals thought to have CMT1. Moreover, because hereditary neuropathy with liability to pressure palsies (HNPP) is based on a DNA deletion in the same area of chromosome 17, this quantitative test may be useful in establishing the presence of HNPP. In a preliminary investigation, four unrelated patients with HNPP yielded test values of 63% and 54%, respectively, of those for nonduplicated samples (CV 19% and 18%, respectively; n = 4), suggesting a deletion in 17p11.2.

Allelic heterogeneity in hereditary motor and sensory neuropathy type la (Charcot-Marie-Tooth disease type 1a)

Neurology ◽  
1993 ◽  
Vol 43 (5) ◽  
pp. 1010-1010 ◽  
Author(s):  
J. E. Hoogendijk ◽  
E.A.M. Janssen ◽  
A. A.W.M. Gabreels-Festen ◽  
G. W. Hensels ◽  
E. M.G. Joosten ◽  
...  
Keyword(s):  
Sensory Neuropathy ◽  
Disease Type ◽  
Allelic Heterogeneity ◽  
Charcot Marie Tooth ◽  
Hereditary Motor ◽  
Charcot Marie Tooth Disease ◽  
Tooth Disease ◽  
Motor And Sensory Neuropathy

MicroRNAs as Biomarkers of Charcot-Marie-Tooth Disease Type 1A

Neurology ◽  
2021 ◽  
pp. 10.1212/WNL.0000000000012266
Author(s):  
Hongge Wang ◽  
Matthew Davison ◽  
Kathryn Wang ◽  
Tai-he Xia ◽  
Katherine M. Call ◽  
...  
Keyword(s):  
Schwann Cell ◽  
Schwann Cells ◽  
Motor Nerve ◽  
Disease Type ◽  
Class Iii ◽  
Protein Biomarkers ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Compound Muscle Action Potentials ◽  
Tooth Disease

Objective:To determine if microRNA’s (miR) are elevated in the plasma of individuals affected by the inherited peripheral neuropathy Charcot-Marie-Tooth Disease, type 1A (CMT1A), miR profiling was employed to compare control and CMT1A plasma.Methods:We performed a screen of CMT1A and control plasma samples to identify miRs that are elevated in CMT1A using next generation sequencing, followed by validation of selected miRs by quantitative PCR, and correlation with protein biomarkers and clinical data: Rash-modified CMT Examination and Neuropathy Scores (CMTES-R and CMTNS-R), ulnar compound muscle action potentials (CMAP), and motor nerve conduction velocities (MNCV).Results:After an initial pilot screen, a broader screen confirmed elevated levels of several muscle-associated miRNAs (miR1, -133a, -133b, and -206, known as myomiRs) along with a set of miRs that are highly expressed in Schwann cells of peripheral nerve. Comparison to other candidate biomarkers for CMT1A (e.g. Neurofilament L, NfL) measured on the same sample set shows a comparable elevation of several miRs (e.g. miR133a, -206, -223) and ability to discriminate cases from controls. NfL levels were most highly correlated with miR133a. In addition, the putative Schwann cell miRs (e.g. miR223, -199a, -328, -409, and -431) correlate with the recently described TMPRSS5 protein biomarker that is most highly expressed in Schwann cells and also elevated in CMT1A plasma.Conclusions:These studies identify a set of miRs that are candidate biomarkers for clinical trials in CMT1A. Some of the miRs may reflect Schwann cell processes that underlie the pathogenesis of the disease.Classification of Evidence:This study provides Class III evidence that a set of plasma miRs are elevated in patients with CMT1A.

Overexpression of ErbB2 and ErbB3 receptors in Schwann cells of patients with Charcot–Marie–Tooth disease type 1A

2006 ◽  
Vol 33 (3) ◽  
pp. 342-349 ◽  
Author(s):  
Roberto Massa ◽  
Camilla Palumbo ◽  
Tiziana Cavallaro ◽  
Maria Beatrice Panico ◽  
Roberto Bei ◽  
...  
Keyword(s):  
Schwann Cells ◽  
Disease Type ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Tooth Disease

scholarly journals Case Report: Oculomotor Palsy With Cyclic Spasms in a Patient With Charcot-Marie-Tooth Disease Type 1

2021 ◽  
Vol 1 ◽  
Author(s):  
Konrad P. Weber ◽  
Christopher J. Bockisch ◽  
Klara Landau
Keyword(s):  
Sensory Neuropathy ◽  
Rare Condition ◽  
Disease Type ◽  
Oculomotor Nerve ◽  
Oculomotor Palsy ◽  
Demyelinating Neuropathy ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Tooth Disease

Oculomotor palsy with cyclic spasms is an extremely rare condition whose exact pathophysiology remains a mystery. We followed a boy from the onset of symptoms at the age of ten months until 15 years and documented the case with video oculography. In addition, he was diagnosed with hereditary motor and sensory neuropathy (Charcot-Marie-Tooth disease type 1). Although a pure coincidence cannot be ruled out, it is conceivable that the underlying demyelinating neuropathy of this patient rendered the oculomotor nerve more susceptible to damage.

scholarly journals Intraepineurial Fat Quantification and Cross-sectional Area Analysis of the Sciatic Nerve Using MRI in Charcot-Marie-Tooth Disease Type 1A Patients

2021 ◽  
Author(s):  
Hyun Su Kim ◽  
Ji Hyun Lee ◽  
Young Cheol Yoon ◽  
Min Jae Cha ◽  
Soo Hyun Nam ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Disease Type ◽  
Sectional Area ◽  
Fat Quantification ◽  
Cross Sectional ◽  
Charcot Marie Tooth ◽  
Charcot Marie Tooth Disease ◽  
Level 3 ◽  
Level 1 ◽  
Tooth Disease

Abstract The objectives of this study were to assess the fat fraction (FF) and cross-sectional area (CSA) of the sciatic nerve in Charcot-Marie-Tooth disease type 1A (CMT1A) patients using Dixon-based proton density fat quantification MRI and to elucidate its potential association with clinical parameters. Thigh MRIs of 18 CMT1A patients and 18 age- and sex-matched volunteers enrolled for a previous study were reviewed. Analyses for FF and CSA of the sciatic nerve were performed at three levels (proximal to distal). CSA and FF were compared between the two groups and among the different levels within each group. The relationship between the MRI parameters and clinical data were assessed in the CMT1A patients. The CMT1A patients showed significantly higher FF at level 3 (p = 0.0217) and significantly larger CSA at all three levels compared with the control participants (p < 0.0001). Comparisons among levels showed significantly higher FF for levels 2 and 3 than for level 1 and significantly larger CSA for level 2 compared with level 1 in CMT1A patients. CSA at level 3 correlated positively with the CMT Neuropathy Score version 2 (CMTNSv2). In conclusion, the sciatic nerve FF of CMT1A patients was significantly higher on level 3 compared with both the controls and the measurements taken on more proximal levels, suggesting the possibility of increased intraepineurial fat within the sciatic nerves of CMT1A patients, with a possible distal tendency. Sciatic nerve CSA at level 3 correlated significantly and positively with CMTNSv2, suggesting its potential value as an imaging marker for clinical severity.

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