Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0025362 (mental retardation)
 15,878 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hereditary sensory neuropathies comprise a group of rare childhood diseases which are classified into four types. We present a Greek boy 11 years old with hereditary sensory neuropathy type IV (congenital sensory neuropathy with anhidrosis) whom we have followed up and studied during the last seven years. Our patient presented for the first time with recurrent hyperthermic episodes without sweating, and lack of pain sensation from the first months of life. Insensitivity to pain and thermal stimuli had resulted in burns on the extremities and self-mutilation of the tongue, lips and fingertips. When he was five and seven years old respectively he had two painless fractures of the ankles which led to insoluble orthopedic problems. He also suffered from mental retardation, which was obvious from his first years of life. Sweat gland investigations showed significant hypohidrosis or anhidrosis although the sweat glands were normal microscopically. Hereditary sensory neuropathy type IV, although rare, is important for dermatologists because it must be differentiated from other anhidrotic syndromes, and in view of the poor prognosis of the condition.
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PMID:Congenital sensory neuropathy with anhidrosis (hereditary sensory neuropathy type IV). 128 6

Congenital sensory neuropathy with anhidrosis (CSNA) is a well-defined entity among a group of sensory deficiency syndromes. Children with this genetic disease are insensitive to pain and temperature, do not sweat, and suffer from mental retardation. Self-mutilation may be severe and may lead to insoluble orthopedic problems. We treated a girl with CSNA, who was born to nonconsanguineous Japanese parents. This disease is important in the dermatological field, since the degree of anhidrosis and self-mutilation influence the prognosis of patients with CSNA.
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PMID:Congenital sensory neuropathy with anhidrosis. 328 96

Congenital insensitivity to pain with anhidrosis (CIPA, hereditary sensory and autonomic neuropathy type IV) is an exceedingly rare disease. Only 31 cases have been reported. We report a 4-year-old girl with CIPA and include a complete review of the literature. CIPA is a severe autosomal recessive condition that leads to self-mutilation in the first months of life and to bone fractures, multiple scars, osteomyelitis, joint deformities, and limb amputation as the children grow older. Mental retardation is common. Death from hyperpyrexia occurs within the first 3 years of life in almost 20% of the patients. Ultrastructural and morphometric studies of the peripheral nerves demonstrate a loss of the unmyelinated and small myelinated fibers. The actual physiopathologic mechanism of this developmental disorder remains unknown.
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PMID:Congenital insensitivity to pain with anhidrosis (hereditary sensory and autonomic neuropathy type IV) 853 89

Congenital insensitivity to pain with anhidrosis is a rare disorder. Its primary clinical features include congenital analgesia, which leads to self-mutilation; inability to sweat, which leads to defective thermoregulation; and mental retardation. A five-year-old boy with consanguineous parents and no family history of the disorder presented with ulcerating lesions on both knees and elbows. His family had discovered the lack of sensation to pain and anhidrosis. Physical examination revealed ulcers on both knees and elbow, self-mutilation of the tongue, fingers, and toes. Sensation to touch was intact and lacrimation was normal. Moderate mental retardation and analgesia were noted in an otherwise normal neurologic examination. The results of electromyographic examination were normal and the application of pilocarpine showed anhidrosis. A skin biopsy specimen was also examined.
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PMID:Congenital insensitivity to pain with anhidrosis. 768 77

Congenital insensitivity to pain with anhidrosis (CIPA; MIM 256800) is an autosomal-recessive disorder characterized by recurrent episodes of unexplained fever, anhidrosis (absence of sweating) and absence of reaction to noxious stimuli, self-mutilating behaviour and mental retardation. The genetic basis for CIPA is unknown. Nerve growth factor (NGF) induces neurite outgrowth and promotes survival of embryonic sensory and sympathetic neurons. Mice lacking the gene for TrkA, a receptor tyrosine kinase for NGF, share dramatic phenotypic features of CIPA, including loss of responses to painful stimuli, although anhidrosis is not apparent in these animals. We therefore considered the human TRKA homologue as a candidate for the CIPA gene. The mRNA and genomic DNA encoding TRKA were analysed in three unrelated CIPA patients who had consanguineous parents. We detected a deletion-, splice- and missense-mutation in the tyrosine kinase domain in these three patients. Our findings strongly suggest that defects in TRKA cause CIPA and that the NGF-TRKA system has a crucial role in the development and function of the nociceptive reception as well as establishment of thermoregulation via sweating in humans. These results also implicate genes encoding other TRK and neurotrophin family members as candidates for developmental defect(s) of the nervous system.
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PMID:Mutations in the TRKA/NGF receptor gene in patients with congenital insensitivity to pain with anhidrosis. 869 25

We report two children in one family with congenital insensitivity to pain, anhidrosis, and mental retardation with behavioural disturbance. Orthopaedic manifestations of this condition include recurrent fractures, osteomyelitis, and neuropathic joints. The differential diagnoses and difficulties in the management of this rare disorder are discussed.
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PMID:Congenital insensitivity to pain: orthopaedic implications. 889 64

Congenital insensitivity to pain with anhidrosis is one of a group of rare diseases termed hereditary sensory-motor neuropathies. Primary clinical features of this entity include congenital analgesia, inability to sweat, and mental retardation. Besides the rarity of these clinical entities, difficulty in evaluating the sensory disturbances, especially in small children, makes the diagnosis a clinical problem. In this article a 3-year-old boy, with consanguineous parents and no family history of the disorder, who was evaluated for two years because of ulcerating lesions on his knees, is presented. Physical examination revealed deep ulceration on his knees and scars from burns on his neck and scalp. Moderate mental retardation and analgesia were noted. There was symmetrical loss of pain and touch sensation on his hands and feet. Electromyographic examination showed absence of action potentials of the ulnar and sural nerves, decrease in the sensory and motor nerve conduction velocities, and amplitude of action potentials. The result of the application of pilocarpine showed anhidrosis. His skin and nerve biopsy specimens were also examined.
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PMID:Congenital insensitivity to pain with anhidrosis. 934 32

A nerve growth factor receptor encoded by the TRKA gene plays an important part in the formation of autonomic neurons and small sensory neurons in dorsal root ganglia and in signal transduction through its intracytoplasmic tyrosine kinase domain. Recently, three mutations in the tyrosine kinase domain of TRKA have been reported in patients with congenital insensitivity to pain with anhidrosis, which is an autosomal recessive disorder characterized by recurrent fever due to absence of sweating, no reaction to noxious stimuli, self-mutilating behavior, and mental retardation. We examined the TRKA gene in five generations of a large Japanese family with many consanguineous marriages who live in a small remote island of the southern part of Japan. We found a novel point mutation at nucleotide 1825 (A-->G transition) resulting in Met-581-Val in the tyrosine kinase domain. Two of the three affected patients were homozygous for this mutation; however, the third affected patient was heterozygous. Further analysis revealed that the third patient was a compound heterozygote with the Met-581-Val mutation in one allele and with a single base C deletion mutation at nucleotide 1726 in exon 14 in the other allele, resulting in a frameshift and premature termination codon.
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PMID:A novel point mutation affecting the tyrosine kinase domain of the TRKA gene in a family with congenital insensitivity to pain with anhidrosis. 1023 76

Congenital insensitivity to pain with anhidrosis (CIPA) is characterized by recurrent episodes of unexplained fever, anhidrosis (inability to sweat), absence of reaction to noxious stimuli, self-mutilating behavior, and mental retardation. Human TRKA encodes a high-affinity tyrosine kinase receptor for nerve growth factor (NGF), a member of the neurotrophin family that induces neurite outgrowth and promotes survival of embryonic sensory and sympathetic neurons. We have recently demonstrated that TRKA is responsible for CIPA by identifying three mutations in a region encoding the intracellular tyrosine kinase domain of TRKA in one Ecuadorian and three Japanese families. We have developed a comprehensive strategy to screen for TRKA mutations, on the basis of the gene's structure and organization. Here we report 11 novel mutations, in seven affected families. These are six missense mutations, two frameshift mutations, one nonsense mutation, and two splice-site mutations. Mendelian inheritance of the mutations is confirmed in six families for which parent samples are available. Two mutations are linked, on the same chromosome, to Arg85Ser and to His598Tyr;Gly607Val, hence, they probably represent double and triple mutations. The mutations are distributed in an extracellular domain, involved in NGF binding, as well as the intracellular signal-transduction domain. These data suggest that TRKA defects cause CIPA in various ethnic groups.
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PMID:Congenital insensitivity to pain with anhidrosis: novel mutations in the TRKA (NTRK1) gene encoding a high-affinity receptor for nerve growth factor. 1033 Mar 44

Congenital insensitivity to pain with anhidrosis (CIPA) is a very rare genetic disorder of the peripheral nervous system characterized by recurrent episodes of unexplained fever, generalized anhidrosis, insensitivity to pain and temperature, and accompanied by self-mutilating behavior and mental retardation. We report on a 16 month-old boy with CIPA who exhibited these characteristic clinical features. A sural nerve biopsy revealed markedly reduced numbers of unmyelinated and small myelinated fibers, consistent with the characteristic features of CIPA.
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PMID:Congenital insensitivity to pain with anhidrosis: a case report. 1048 30


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