Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0152025 (polyneuropathy)
 7,862 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The authors present a child affected with diaphragmatic paralysis in the early neonatal period. Although no electroneuromyographic abnormalities were reported, the patient developed dramatic motor and respiratory impairment with impossibility to wean from mechanical ventilation. Repeated electroneuromyographic study at age 4 months revealed severe neurogenic changes and sensory nerve abnormalities with more preserved nerve conduction velocities. Genetic studies identified 2 mutations in the gene IGHMBP2. These results support the consideration of this entity as a form of sensory-motor rapidly progressive polyneuropathy rather than a primary anterior horn disease (IGHMBP2-related neuropathy). A review of the series of mutated patients in the French National Database gives new insights of the incidence of this disease in France.
 ...
PMID:Diaphragmatic weakness with progressive sensory and motor polyneuropathy: case report of a neonatal IGHMBP2-related neuropathy. 2279 46

Charcot-Marie-Tooth disease is a group of genetically heterogeneous disorders characterized by a sensorimotor polyneuropathy with subsequent muscle atrophy, areflexia, and sensory loss. More than 60 genes have been linked to Charcot-Marie-Tooth phenotypes, including IGHMBP2. Until recently, mutations in IGHMBP2 were exclusively associated with spinal muscular atrophy with respiratory distress (SMARD1). We present a sibling pair with a novel homozygous truncating mutation in IGHMBP2. The patients presented with childhood-onset distal weakness, wasting in the upper and lower limbs, areflexia and decreased sensation, but no respiratory involvement. Exome sequencing was performed and a homozygous variant was identified (c.2601_2604del; p.Lys868Profs*109). Sanger sequencing confirmed the presence of this variant in a homozygous state in the two affected siblings, while both parents were heterozygous. Further analyses showed decreased mRNA and IGHMBP2 protein in a lymphoblast cell line derived from one of the siblings. We demonstrate the utility of next-generation sequencing in reaching a molecular diagnosis for a heterogeneous condition such as Charcot-Marie-Tooth. Taken together, our data and that from the literature suggest that the spectrum of clinical presentations associated with mutations in IGHMBP2 may be secondary, at least in part, to the amount of residual protein.
...
PMID:Autosomal recessive axonal polyneuropathy in a sibling pair due to a novel homozygous mutation in IGHMBP2. 2629 7

Biallelic mutations in IGHMBP2 cause spinal muscular atrophy with respiratory distress type 1 (SMARD1) or Charcot-Marie-Tooth type 2S (CMT2S). We report three families variably affected by IGHMBP2 mutations. Patient 1, an 8-year-old boy with two homozygous variants: c.2T>C and c.861C>G, was wheelchair bound due to sensorimotor axonal neuropathy and chronic respiratory failure. Patient 2 and his younger sister, Patient 3, had compound heterozygous variants: c.983_987delAAGAA and c.1478C>T. However, clinical phenotypes differed markedly as the elder with sensorimotor axonal neuropathy had still unaffected respiratory function at 4.5 years, whereas the younger presented as infantile spinal muscular atrophy and died from relentless respiratory failure at 11 months. Patient 4, a 6-year-old girl homozygous for IGHMBP2 c.449+1G>T documented to result in two aberrant transcripts, was wheelchair dependent due to axonal polyneuropathy. The clinical presentation in Patients 1 and 3 were consistent with SMARD1, whereas Patients 2 and 4 were in agreement with CMT2S.
 ...
PMID:Clinical and molecular characteristics in three families with biallelic mutations in IGHMBP2. 2745 Sep 22

The authors report a child with spinal muscular atrophy with respiratory distress type 1 (SMARD1). She presented atypically with hypothyroidism and heart failure due to septal defects that required early heart surgery and microcephaly in association with cerebral atrophy and thin corpus collosum. The subsequent asymmetrical onset of diaphragmatic paralysis, persistent hypotonia, and generalized muscle weakness led to the suspicion of spinal muscular atrophy with respiratory distress type 1. Sanger sequencing confirmed a compound heterozygous mutation in the Immunoglobulin Mu Binding Protein 2 (IGHMBP2) gene, with a known mutation c.2362C > T (p.Arg788*) and a novel frameshift mutation c.2048delG (p.Gly683A1afs*50). Serial nerve conduction study and electromyography confirmed progressive sensorimotor polyneuropathy and neuronopathy. In summary, this case report describes a child with spinal muscular atrophy with respiratory distress type 1 also with congenital cardiac disease and endocrine dysfunction, expanding the phenotypic spectrum of this condition. A high index of suspicion is needed in diagnosing this rare condition to guide the management and genetic counseling.
 ...
PMID:Spinal Muscular Atrophy With Respiratory Distress Type 1-A Child With Atypical Presentation. 2976 Nov 30