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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Hum+Genet 2012 ; 91 (2): 320-9 Nephropedia Template TP
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The TRK-fused gene is mutated in hereditary motor and sensory neuropathy with proximal dominant involvement #MMPMID22883144
Ishiura H; Sako W; Yoshida M; Kawarai T; Tanabe O; Goto J; Takahashi Y; Date H; Mitsui J; Ahsan B; Ichikawa Y; Iwata A; Yoshino H; Izumi Y; Fujita K; Maeda K; Goto S; Koizumi H; Morigaki R; Ikemura M; Yamauchi N; Murayama S; Nicholson GA; Ito H; Sobue G; Nakagawa M; Kaji R; Tsuji S
Am J Hum Genet 2012[Aug]; 91 (2): 320-9 PMID22883144show ga
Hereditary motor and sensory neuropathy with proximal dominant involvement (HMSN-P) is an autosomal-dominant neurodegenerative disorder characterized by widespread fasciculations, proximal-predominant muscle weakness, and atrophy followed by distal sensory involvement. To date, large families affected by HMSN-P have been reported from two different regions in Japan. Linkage and haplotype analyses of two previously reported families and two new families with the use of high-density SNP arrays further defined the minimum candidate region of 3.3 Mb in chromosomal region 3q12. Exome sequencing showed an identical c.854C>T (p.Pro285Leu) mutation in the TRK-fused gene (TFG) in the four families. Detailed haplotype analysis suggested two independent origins of the mutation. Pathological studies of an autopsied patient revealed TFG- and ubiquitin-immunopositive cytoplasmic inclusions in the spinal and cortical motor neurons. Fragmentation of the Golgi apparatus, a frequent finding in amyotrophic lateral sclerosis, was also observed in the motor neurons with inclusion bodies. Moreover, TAR DNA-binding protein 43 kDa (TDP-43)-positive cytoplasmic inclusions were also demonstrated. In cultured cells expressing mutant TFG, cytoplasmic aggregation of TDP-43 was demonstrated. These findings indicate that formation of TFG-containing cytoplasmic inclusions and concomitant mislocalization of TDP-43 underlie motor neuron degeneration in HMSN-P. Pathological overlap of proteinopathies involving TFG and TDP-43 highlights a new pathway leading to motor neuron degeneration.
|Base Sequence[MESH]
|Chromosomes, Human, Pair 3/*genetics[MESH]
|DNA-Binding Proteins/genetics[MESH]
|Exome/genetics[MESH]
|Genetic Linkage[MESH]
|Genetic Predisposition to Disease/*genetics[MESH]
|Golgi Apparatus/pathology[MESH]
|Haplotypes/genetics[MESH]
|Hereditary Sensory and Motor Neuropathy/*genetics/pathology[MESH]