285 results match your criteria Hartnup Disease


How an Environment of Stress and Social Risk Shapes Student Engagement With Social Media as Potential Digital Learning Platforms: Qualitative Study.

JMIR Med Educ 2018 Jul 13;4(2):e10069. Epub 2018 Jul 13.

Imperial College Business School, Imperial College London, London, United Kingdom.

Background: Social media has been increasingly used as a learning tool in medical education. Specifically, when joining university, students often go through a phase of adjustment, and they need to cope with various challenges such as leaving their families and friends and trying to fit into a new environment. Research has shown that social media helps students to connect with old friends and to establish new relationships. Read More

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Human intestine luminal ACE2 and amino acid transporter expression increased by ACE-inhibitors.

Amino Acids 2015 Apr 23;47(4):693-705. Epub 2014 Dec 23.

Institute of Physiology and Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.

Sodium-dependent neutral amino acid transporter B(0)AT1 (SLC6A19) and imino acid (proline) transporter SIT1 (SLC6A20) are expressed at the luminal membrane of small intestine enterocytes and proximal tubule kidney cells where they exert key functions for amino acid (re)absorption as documented by their role in Hartnup disorder and iminoglycinuria, respectively. Expression of B(0)AT1 was shown in rodent intestine to depend on the presence of the carboxypeptidase angiotensin-converting enzyme 2 (ACE2). This enzyme belongs to the renin-angiotensin system and its expression is induced by treatment with ACE-inhibitors (ACEIs) or angiotensin II AT1 receptor blockers (ARBs) in many rodent tissues. Read More

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April 2015
6 Reads

Severe persistent unremitting dermatitis, chronic diarrhea and hypoalbuminemia in a child; Hartnup disease in setting of celiac disease.

BMC Pediatr 2014 Dec 20;14:311. Epub 2014 Dec 20.

Makassed Hospital, Alquds University, Medical College, Jerusalem, Palestine.

Background: Celiac disease (CD) is a complex autoimmune disorder that can lead to an inflammatory small intestinal villous atrophy and malabsorption. Hartnup disease is an autosomal recessive disorder caused by increased urinary excretion of neutral amino acids. Co-occurrence of Hartnup disease and CD is extremely rare with only a single case reported. Read More

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December 2014

Rare mutations associating with serum creatinine and chronic kidney disease.

Hum Mol Genet 2014 Dec 31;23(25):6935-43. Epub 2014 Jul 31.

deCODE Genetics, 101 Reykjavik, Iceland Faculty of Medicine

Chronic kidney disease (CKD) is a complex disorder with a strong genetic component. A number of common sequence variants have been found to associate with serum creatinine (SCr), estimated glomerular filtration rate (eGFR) and/or CKD. We imputed 24 million single-nucleotide polymorphisms and insertions/deletions identified by whole-genome sequencing of 2230 Icelanders into 81 656 chip-typed individuals and 112 630 relatives of genotyped individuals over the age of 18 with SCr measurements. Read More

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December 2014
8 Reads

ACE2 - from the renin-angiotensin system to gut microbiota and malnutrition.

Microbes Infect 2013 Nov 17;15(13):866-73. Epub 2013 Aug 17.

IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria.

The renin-angiotensin system (RAS) is a complex network that regulates blood pressure, electrolyte and fluid homeostasis, as well as the function of several organs. Angiotensin-converting enzyme 2 (ACE2) was identified as an enzyme that negatively regulates the RAS by converting Ang II, the main bioactive molecule of the RAS, to Ang 1-7. Thus, ACE2 counteracts the role of angiotensin-converting enzyme (ACE) which generates Ang II from Ang I. Read More

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November 2013
1 Read

Diseases associated with general amino acid transporters of the solute carrier 6 family (SLC6).

Authors:
Stefan Broer

Curr Mol Pharmacol 2013 Jul;6(2):74-87

Research School of Biology, Australian National University, Canberra, ACT 0200, Australia.

Amino acid transporters of the SLC6 family mediate the Na(+)-dependent uptake of neutral amino acids into neurons and epithelial cells of the intestine, kidney and other organs. They are integral parts of amino acid homeostasis in the whole body and the brain. In the intestine they are involved in protein absorption, while in the kidney they regulate plasma amino acid concentrations through reabsorption. Read More

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July 2013
3 Reads

Ataxia.

Handb Clin Neurol 2013 ;112:1213-7

Division of Pediatric Neurology, Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA.

The approach to the child with ataxia requires a detailed history and careful general and neurological examination as well as selected blood work and brain imaging and increasingly available genetic testing for inherited ataxias that usually have an episodic or progressive presentation. The differential of acute and recurring ataxia covered in this chapter includes intoxication (e.g. Read More

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March 2014
3 Reads

Defective intestinal amino acid absorption in Ace2 null mice.

Am J Physiol Gastrointest Liver Physiol 2012 Sep 12;303(6):G686-95. Epub 2012 Jul 12.

Institute of Physiology, University of Zurich, Switzerland.

Mutations in the main intestinal and kidney luminal neutral amino acid transporter B(0)AT1 (Slc6a19) lead to Hartnup disorder, a condition that is characterized by neutral aminoaciduria and in some cases pellagra-like symptoms. These latter symptoms caused by low-niacin are thought to result from defective intestinal absorption of its precursor L-tryptophan. Since Ace2 is necessary for intestinal B(0)AT1 expression, we tested the impact of intestinal B(0)AT1 absence in ace2 null mice. Read More

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September 2012
1 Read

[Amino acids in cerebrospinal fluid and plasma: its usefulness in the study of neuropaediatric diseases].

Rev Neurol 2012 Apr;54(7):394-8

Hospital Sant Joan de Deu, 08950 Esplugues de Llobregat, Espana.

Introduction: Studying the amino acids in cerebrospinal fluid (CSF) is essential in the diagnosis of some neurological diseases and is an important aid in the diagnosis of others. No research has been published in the literature to prove the physiological relationship between the values of amino acids in CSF and plasma in the paediatric population.

Aim: To define a set of ratios for amino acids in plasma and CSF in the paediatric population that can be used in daily clinical practice. Read More

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April 2012
1 Read

Collectrin and ACE2 in renal and intestinal amino acid transport.

Channels (Austin) 2011 Sep-Oct;5(5):410-23. Epub 2011 Sep 1.

INRA/AgroParisTech, Paris, France.

Neutral amino acid transporters of the SLC6 family are expressed at the apical membrane of kidney and/or small intestine, where they (re-)absorb amino acids into the body. In this review we present the results concerning the dependence of their apical expression with their association to partner proteins. We will in particular focus on the situation of B0AT1 and B0AT3, that associate with members of the renin-angiotensin system (RAS), namely Tmem27 and angiotensin-converting enzyme 2 (ACE2), in a tissue specific manner. Read More

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February 2012

Impaired nutrient signaling and body weight control in a Na+ neutral amino acid cotransporter (Slc6a19)-deficient mouse.

J Biol Chem 2011 Jul 2;286(30):26638-51. Epub 2011 Jun 2.

Research School of Biology, Australian National University, Canberra, Australian Capital Territory 0200, Australia.

Amino acid uptake in the intestine and kidney is mediated by a variety of amino acid transporters. To understand the role of epithelial neutral amino acid uptake in whole body homeostasis, we analyzed mice lacking the apical broad-spectrum neutral (0) amino acid transporter B(0)AT1 (Slc6a19). A general neutral aminoaciduria was observed similar to human Hartnup disorder which is caused by mutations in SLC6A19. Read More

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July 2011
6 Reads

Ancient DNA recovers the origins of Māori feather cloaks.

Mol Biol Evol 2011 Oct 10;28(10):2741-50. Epub 2011 May 10.

Institute of Natural Sciences, Massey University, Auckland, New Zealand.

Feather cloaks ("kakahu"), particularly those adorned with kiwi feathers, are treasured items or "taonga" to the Māori people of "Aotearoa"/New Zealand. They are considered iconic expression of Māori culture. Despite their status, much of our knowledge of the materials used to construct cloaks, the provenance of cloaks, and the origins of cloak making itself, has been lost. Read More

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October 2011
4 Reads

Amino acid absorption and homeostasis in mice lacking the intestinal peptide transporter PEPT1.

Am J Physiol Gastrointest Liver Physiol 2011 Jul 24;301(1):G128-37. Epub 2011 Feb 24.

ZIEL Research Center of Nutrition and Food Sciences, Abteilung Biochemie, Technische Universität München, Freising, Germany.

The intestinal peptide transporter PEPT1 mediates the uptake of di- and tripeptides derived from dietary protein breakdown into epithelial cells. Whereas the transporter appears to be essential to compensate for the reduced amino acid delivery in patients with mutations in amino acid transporter genes, such as in cystinuria or Hartnup disease, its physiological role in overall amino acid absorption is still not known. To assess the quantitative importance of PEPT1 in overall amino acid absorption and metabolism, PEPT1-deficient mice were studied by using brush border membrane vesicles, everted gut sacs, and Ussing chambers, as well as by transcriptome and proteome analysis of intestinal tissue samples. Read More

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July 2011
1 Read

Hartnup disease masked by kwashiorkor.

J Health Popul Nutr 2010 Aug;28(4):413-5

Department of Pediatric Endocrinology and Metabolism, Ataturk University, Erzurum, Turkey.

This report describes an 11-month old girl with Hartnup disease presenting with kwashiorkor and acrodermatitis enteropathica-like skin lesions but free of other clinical findings. This case with kwashiorkor had acrodermatitis enteropathica-like desquamative skin eruption. Since zinc level was in the normal range, investigation for a metabolic disorder was considered, and Hartnup disease was diagnosed. Read More

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August 2010
8 Reads

The serum and glucocorticoid inducible kinases SGK1-3 stimulate the neutral amino acid transporter SLC6A19.

Cell Physiol Biochem 2010 18;25(6):723-32. Epub 2010 May 18.

Department of Physiology I, University of Tübingen, 72076 Tübingen, Germany.

The neutral amino acid transporter SLC6A19 (B(0)AT1) plays a decisive role in transport of neutral amino acids in the kidney and intestine. Recently, mutations in SLC6A19 were identified that result in severe neutral aminoaciduria known as Hartnup disorder. SLC6A19 expression and function is controlled by the brush-border angiotensin-converting enzyme 2 (ACE2). Read More

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September 2010
2 Reads

Novel mutation in SLC6A19 causing late-onset seizures in Hartnup disorder.

Pediatr Neurol 2010 May;42(5):369-71

Department of Pediatrics, Genetic and Metabolic Clinic, Children's Hospital, Pusan National University, Gyeongnam, South Korea.

Hartnup disorder is caused by an inborn error of neutral amino acid transport in the kidneys and intestines. It is characterized by pellagra-like rash, ataxia, and psychotic behavior. Elevated urinary neutral amino acids are the first indicator of the disorder. Read More

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May 2010
2 Reads
1.500 Impact Factor

[Toward a more rational field-genetic epidemiology].

Authors:
Akio Koizumi

Nihon Eiseigaku Zasshi 2010 Jan;65(1):37-47

Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan.

Genetic dissection of diseases is one of the epoch-making achievements in modern medicine. Positional cloning is a key method to isolate disease-related genes. For positional cloning, there are two conventional methods: family-based studies and case-control studies. Read More

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January 2010

Angiotensin-converting enzyme 2 (ACE2) in disease pathogenesis.

Circ J 2010 Mar 4;74(3):405-10. Epub 2010 Feb 4.

Department of Biological Informatics and Experimental Therapeutics, the Global COE program, Akita University Graduate School of Medicine, Japan.

Angiotensin-converting enzyme 2 (ACE2), a first homolog of ACE, regulates the renin-angiotensin system by counterbalancing ACE activity. Accumulating evidence in recent years has demonstrated a physiological and pathological role of ACE2 in the cardiovascular, renal and respiratory systems. For instance, in the acute respiratory distress syndrome (ARDS), ACE, AngII, and AT1R promote the disease pathogenesis, whereas ACE2 and the AT2R protect from ARDS. Read More

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March 2010
2 Reads

The role of the neutral amino acid transporter B0AT1 (SLC6A19) in Hartnup disorder and protein nutrition.

Authors:
Stefan Bröer

IUBMB Life 2009 Jun;61(6):591-9

School of Biology, College of Medicine, Biology and Environment, Australian National University, Canberra, Australian Capital Territory, Australia.

Hartnup disorder (OMIM 234500) is an autosomal recessive disorder, which was first described in 1956 as an aminoaciduria of neutral amino acids accompanied by a variety of symptoms, such as a photo-sensitive skin-rash and cerebellar ataxia. The disorder is caused by mutations in the neutral amino acid transporter B(0)AT1 (SLC6A19). To date 21 mutations have been identified in more than twenty families. Read More

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A novel missense mutation in the SLC6A19 gene in a Chinese family with Hartnup disorder.

Int J Dermatol 2009 Apr;48(4):388-92

Department of Dermatology, Peking University First and Third Hospital, Beijing and He Ping Hospital, Chang Zhi Medical College, Changzhi, China.

Background: Hartnup disease is a rare autosomal-recessive abnormality of renal and gastrointestinal neutral amino acid transport associated with neurologic, psychiatric, and dermatologic symptoms. Mutations in the SLC6A19 gene have been proposed to be responsible for the underlying changes in this disorder.

Aim: To investigate a pedigree with Hartnup disorder and to search for the mutation in the SLC6A19 gene in this pedigree. Read More

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April 2009
3 Reads

Tissue-specific amino acid transporter partners ACE2 and collectrin differentially interact with hartnup mutations.

Gastroenterology 2009 Mar 29;136(3):872-82. Epub 2008 Oct 29.

Institute of Physiology and Zürich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.

Background & Aims: Hartnup amino acid transporter B(0)AT1 (SLC6A19) is the major luminal sodium-dependent neutral amino acid transporter of small intestine and kidney proximal tubule. The expression of B(0)AT1 in kidney was recently shown to depend on its association with collectrin (Tmem27), a protein homologous to the membrane-anchoring domain of angiotensin-converting enzyme (ACE) 2.

Methods: Because collectrin is almost absent from small intestine, we tested the hypothesis that it is ACE2 that interacts with B(0)AT1 in enterocytes. Read More

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March 2009
2 Reads

Kidney amino acid transport.

Pflugers Arch 2009 May 28;458(1):53-60. Epub 2009 Jan 28.

Institute of Physiology, University of Zürich, Switzerland.

Near complete reabsorption of filtered amino acids is a main specialized transport function of the kidney proximal tubule. This evolutionary conserved task is carried out by a subset of luminal and basolateral transporters that together form the transcellular amino acid transport machinery similar to that of small intestine. A number of other amino acid transporters expressed in the basolateral membrane of proximal kidney tubule cells subserve either specialized metabolic functions, such as the production of ammonium, or are part of the cellular housekeeping equipment. Read More

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May 2009
2 Reads

Severe exfoliative erythema of malnutrition in a child with coexisting coeliac and Hartnup's disease.

Clin Exp Dermatol 2009 Mar 6;34(2):178-82. Epub 2008 Nov 6.

Department of Dermatology, Tawam Hospital in affiliation with Johns Hopkins Medicine, Al Ain, UAE.

Exfoliative erythema of malnutrition is a collective term for skin lesions caused by a combination of multiple deficiencies in vitamins, microelements, essential fatty acids and amino acids. We report a 3-year-old Iraqi girl with malnutrition due to coexisting coeliac and Hartnup's disease. On admission to hospital, she presented with kwashiorkor, anaemia, hepatitis and hypoalbuminia. Read More

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March 2009
1 Read

Association study of polymorphisms in the neutral amino acid transporter genes SLC1A4, SLC1A5 and the glycine transporter genes SLC6A5, SLC6A9 with schizophrenia.

BMC Psychiatry 2008 Jul 18;8:58. Epub 2008 Jul 18.

Division of Human Molecular Genetics, Research Center for Genetic Information, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan.

Background: Based on the glutamatergic dysfunction hypothesis for schizophrenia pathogenesis, we have been performing systematic association studies of schizophrenia with the genes involved in glutametergic transmission. We report here association studies of schizophrenia with SLC1A4, SLC1A5 encoding neutral amino acid transporters ASCT1, ASCT2, and SLC6A5, SLC6A9 encoding glycine transporters GLYT2, GLYT1, respectively.

Methods: We initially tested the association of 21 single nucleotide polymorphisms (SNPs) distributed in the four gene regions with schizophrenia using 100 Japanese cases-control pairs and examined allele, genotype and haplotype association with schizophrenia. Read More

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July 2008
4 Reads

Further evidence for allelic heterogeneity in Hartnup disorder.

Hum Mutat 2008 Oct;29(10):1217-21

Medical Genetics Research Unit, Australian National University (ANU) Medical School, Canberra, Australian Capital Territory (ACT), Australia.

Hartnup disorder is an autosomal recessive impairment of amino acid transport in kidney and intestine. Mutations in SLC6A19 have been shown to cosegregate with the disease in the predicted recessive manner; however, in two previous studies (Seow et al., Nat Genet 2004;36:1003-1007; Kleta et al. Read More

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October 2008
12 Reads

A protein complex in the brush-border membrane explains a Hartnup disorder allele.

FASEB J 2008 Aug 18;22(8):2880-7. Epub 2008 Apr 18.

School of Biochemistry and Molecular Biology, Australian National University, Linnaeus Way 41, Canberra, ACT 0200, Australia.

Protein absorption in the intestine is mediated by proteases and brush-border peptidases together with peptide and amino acid transporters. Neutral amino acids are generated by a variety of aminopeptidases and carboxypeptidases and are subsequently taken up by the amino acid transporter B(0)AT1 (SLC6A19), which is mutated in Hartnup disorder. Coexpression of B(0)AT1 together with the brush-border carboxypeptidase angiotensin-converting enzyme 2 (ACE2) in Xenopus laevis oocytes led to a dramatic increase of transporter expression at the oocyte surface. Read More

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August 2008
1 Read

Apical transporters for neutral amino acids: physiology and pathophysiology.

Authors:
Stefan Bröer

Physiology (Bethesda) 2008 Apr;23:95-103

School of Biochemistry and Molecular Biology, Australian National University, Canberra, Australia.

Absorption of amino acids in kidney and intestine involves a variety of transporters for different groups of amino acids. This is illustrated by inherited disorders of amino acid absorption, such as Hartnup disorder, cystinuria, iminoglycinuria, dicarboxylic aminoaciduria, and lysinuric protein intolerance, affecting separate groups of amino acids. Recent advances in the molecular identification of apical neutral amino acid transporters has shed a light on the molecular basis of Hartnup disorder and iminoglycinuria. Read More

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April 2008
4 Reads

Aminoacidurias: Clinical and molecular aspects.

Kidney Int 2008 Apr 16;73(8):918-25. Epub 2008 Jan 16.

Institute of Physiology and Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.

Inherited aminoacidurias are caused by defective amino-acid transport through renal (reabsorption) and in many cases also small intestinal epithelia (absorption). Recently, many of the genes causing this abnormal transport have been molecularly identified. In this review, we summarize the latest findings in the clinical and molecular aspects concerning the principal aminoacidurias, cystinuria, lysinuric protein intolerance, Hartnup disorder, iminoglycinuria, and dicarboxylic aminoaciduria. Read More

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Amino acid transport across mammalian intestinal and renal epithelia.

Authors:
Stefan Bröer

Physiol Rev 2008 Jan;88(1):249-86

School of Biochemistry and Molecular Biology, Australian National University, Canberra, Australian Capital Territory, Australia.

The transport of amino acids in kidney and intestine is critical for the supply of amino acids to all tissues and the homeostasis of plasma amino acid levels. This is illustrated by a number of inherited disorders affecting amino acid transport in epithelial cells, such as cystinuria, lysinuric protein intolerance, Hartnup disorder, iminoglycinuria, dicarboxylic aminoaciduria, and some other less well-described disturbances of amino acid transport. The identification of most epithelial amino acid transporters over the past 15 years allows the definition of these disorders at the molecular level and provides a clear picture of the functional cooperation between transporters in the apical and basolateral membranes of mammalian epithelial cells. Read More

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January 2008
3 Reads

Hartnup disease.

Indian J Dermatol 2008 Jan;53(1):31-2

Department of Pediatrics, Clinical Epidemiology Unit, Indira Gandhi Government Medical College, Nagpur, India.

A 10 year old girl presented with clinical signs and symptoms of the triad of niacin deficiency namely skin eruptions, ataxia, mental changes and diarrhea. Although this deficiency could be nutritional where maize is a staple diet, this patient had neutral aminoaciduria which indicated a defective transport of neutral amino acid transporter in the kidneys and intestine resulting in failure of transport of tryptophan and other neutral (ie, monoaminomonocarboxylic) alpha-amino acids in the small intestine and the renal tubules. Read More

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January 2008
1 Read

Quebec neonatal mass urinary screening programme: from micromolecules to macromolecules.

J Inherit Metab Dis 2007 Aug 14;30(4):515-21. Epub 2007 Jun 14.

Service of Genetics, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, 3001, 12th Avenue North, Sherbrooke, QC, Canada, J1H 5N4.

The Quebec Mass Urinary Screening Programme, initiated in 1971, has resulted in the screening of more than 2,500,000 newborns in the province of Quebec for 25 inherited Mendelian disorders divided into two groups. The first group concerns urea cycle disorders (citrullinaemia, hyperargininaemia, argininosuccinic aciduria), ketotic hyperglycinaemia, and organic acidurias (methylmalonic aciduria, glutaric aciduria type I, etc.); the second group relates to disorders of amino acid metabolism (cystathioninuria, prolidase deficiency, etc. Read More

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August 2007
1 Read

Persistence of the common Hartnup disease D173N allele in populations of European origin.

Ann Hum Genet 2007 Nov 7;71(Pt 6):755-61. Epub 2007 Jun 7.

Medical Genetics Research Unit, ANU Medical School, Canberra, Australia.

Hartnup disorder is an aminoaciduria that results from mutations in the recently described gene SLC6A19 on chromosome 5p15.33. The disease is inherited in a simple recessive manner and ten different mutations have been described to date. Read More

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November 2007
6 Reads

Natural disordered sequences in the amino terminal domain of nuclear receptors: lessons from the androgen and glucocorticoid receptors.

Nucl Recept Signal 2007 Mar 9;5:e001. Epub 2007 Mar 9.

School of Medical Sciences, IMS Building, University of Aberdeen, Foresterhill, Aberdeen, Scotland, UK.

Steroid hormones are a diverse class of structurally related molecules, derived from cholesterol, that include androgens, estrogens, progesterone and corticosteroids. They represent an important group of physiologically active signalling molecules that bind intracellular receptor proteins and regulate genes involved in developmental, reproductive and metabolic processes. The receptor proteins share structurally and functionally related ligand binding and DNA-binding domains, but possess distinct N-terminal domains (NTD) of unique length and amino acids sequence. Read More

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March 2007
2 Reads

Complementation analysis demonstrates that insulin cross-links both alpha subunits in a truncated insulin receptor dimer.

J Biol Chem 2007 May 5;282(18):13754-8. Epub 2007 Mar 5.

Department of Medicine, University of Chicago, Chicago, Illinois 60637, USA.

The insulin receptor is a homodimer composed of two alphabeta half receptors. Scanning mutagenesis studies have identified key residues important for insulin binding in the L1 domain (amino acids 1-150) and C-terminal region (amino acids 704-719) of the alpha subunit. However, it has not been shown whether insulin interacts with these two sites within the same alpha chain or whether it cross-links a site from each alpha subunit in the dimer to achieve high affinity binding. Read More

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May 2007
2 Reads

[Clinical studies of pediatric malabsorption syndromes].

Fukuoka Igaku Zasshi 2006 Nov;97(11):322-50

Department of Pediatrics Fukuoka Red Cross Hospital, Fukuoka, Japan.

Multiple cases with various types of pediatric malabsorption syndromes were evaluated. The clinical manifestations, laboratory findings, pathophysiology, and histopathological descriptions of each patient were analyzed in an effort to clear the pathogenesis of the malabsorption syndromes and the treatments were undertaken. The cases studied, included one patient with cystic fibrosis, two with lactose intolerance with lactosuria (Durand type), one with primary intestinal lymphangiectasia, two with familial hypobetalipoproteinemia, one with Hartnup disease, one with congenital chroride diarrhea, one with acrodermatitis enteropathica, one with intestinal nodular lymphoid hyperplasia (NLH), five with intractable diarrhea of early infancy and four with glycogenosis type Ia. Read More

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November 2006
11 Reads

Aminoaciduria and altered renal expression of luminal amino acid transporters in mice lacking novel gene collectrin.

Am J Physiol Renal Physiol 2007 Feb 19;292(2):F533-44. Epub 2006 Sep 19.

Dept. of Medicine, Duke University, Durham, NC, USA.

Defects in renal proximal tubule transport manifest in a number of human diseases. Although variable in clinical presentation, disorders such as Hartnup disease, Dent's disease, and Fanconi syndrome are characterized by wasting of solutes commonly recovered by the proximal tubule. One common feature of these disorders is aminoaciduria. Read More

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February 2007

Acrodermatitis enteropathica-like eruptions in a child with Hartnup disease.

Pediatr Dermatol 2006 May-Jun;23(3):262-5

Department of Dermatology, Inönü University, Malatya, Faculty of Medicine, Atatürk University, Erzurum, Turkey.

Acrodermatitis enteropathica-like eruptions, not related to zinc deficiency, have been rarely reported in some metabolic disorders. Reported patients usually had low levels of essential amino acids, particularly isoleucine. Here we report a girl who first presented with an acrodermatitis enteropathica-like eruption and eventually had the diagnosis of Hartnup disease with a normal isoleucine level. Read More

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December 2006
1 Read

[Hartnup disorder: Pathogenesis, pathophysiology, and therapy].

Authors:
Toshihiro Ohura

Nihon Rinsho 2006 Feb;64 Suppl 2:541-4

Department of Pediatrics, Tohoku University, Graduate School of Medicine.

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February 2006
2 Reads

[Disorders of renal tubular transport of amino acids, hexose and phosphate].

Nihon Rinsho 2006 Feb;64 Suppl 2:522-7

Department of Nephrology and Hypertension, Saitama Medical Center, Saitama Medical School.

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February 2006
1 Read

The molecular basis of neutral aminoacidurias.

Pflugers Arch 2006 Jan 29;451(4):511-7. Epub 2005 Jul 29.

School of Biochemistry and Molecular Biology, Australian National University, Canberra.

Recent success in the molecular cloning and identification of apical neutral amino acid transporters has shed a new light on inherited neutral amino acidurias, such as Hartnup disorder and Iminoglycinuria. Hartnup disorder is caused by mutations in the neutral amino acid transporter B(0) AT1 (SLC6A19). The transporter is found in kidney and intestine, where it is involved in the resorption of all neutral amino acids. Read More

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January 2006

The genetics of heteromeric amino acid transporters.

Physiology (Bethesda) 2005 Apr;20:112-24

Department of Biochemistry and Molecular Biology, Faculty of Biology and Institut de Recerca Biomedica de Barcelona, Barcelona Science Park, University of Barcelona, Spain.

Heteromeric amino acid transporters (HATs) are composed of a heavy (SLC3 family) and a light (SLC7 family) subunit. Mutations in system b(0,+) (rBAT-b(0,+)AT) and in system y(+)L (4F2hc-y(+)LAT1) cause the primary inherited aminoacidurias (PIAs) cystinuria and lysinuric protein intolerance, respectively. Recent developments [including the identification of the first Hartnup disorder gene (B0AT1; SLC6A19)] and knockout mouse models have begun to reveal the basis of renal and intestinal reabsorption of amino acids in mammals. Read More

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April 2005
2 Reads

Novel renal amino acid transporters.

Annu Rev Physiol 2005 ;67:557-72

University of Zurich, Institute of Physiology, CH-8057 Zurich, Switzerland.

Reabsorption of amino acids, similar to that of glucose, is a major task of the proximal kidney tubule. Various amino acids are actively transported across the luminal brush border membrane into proximal tubule epithelial cells, most of which by cotransport. An important player is the newly identified cotransporter (symporter) B0AT1 (SLC6A19), which imports a broad range of neutral amino acids together with Na+ across the luminal membrane and which is defective in Hartnup disorder. Read More

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Hartnup disorder: unraveling the mystery.

Trends Pharmacol Sci 2005 Feb;26(2):53-5

Membrane Biology Laboratory, Medical and Research Services, VAGLA Healthcare System and UCLA School of Medicine, Los Angeles, CA 90073, USA.

Hartnup disorder is an autosomal recessive disease that can be associated with neurological, psychiatric and dermatological abnormalities or be asymptomatic. Excessive intestinal and urinary loss of neutral amino acids is an essential feature of this disorder, which had been presumed to be due to hereditary abnormalities in an apical membrane-situated amino acid transporter. As anticipated, recently, mutations in the cytoplasmic and transmembrane domains of SLC6A19, the recently cloned neutral amino acid transporter, were detected in members of families with Hartnup disorder. Read More

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February 2005
2 Reads

Neutral amino acid transport in epithelial cells and its malfunction in Hartnup disorder.

Biochem Soc Trans 2005 Feb;33(Pt 1):233-6

School of Biochemistry and Molecular Biology, Australian National University, Canberra, ACT 0200, Australia.

Hartnup disorder is an autosomal recessive abnormality of renal and gastrointestinal neutral amino acid transport. A corresponding transport activity has been characterized in kidney and intestinal cells and named system B(0). The failure to resorb amino acids in this disorder is thought to be compensated by a protein-rich diet. Read More

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February 2005
1 Read

Hartnup disorder is caused by mutations in the gene encoding the neutral amino acid transporter SLC6A19.

Nat Genet 2004 Sep 1;36(9):1003-7. Epub 2004 Aug 1.

Gene Therapy, Centenary Institute of Cancer Medicine & Cell Biology, University of Sydney, NSW 2042, Australia.

Hartnup disorder (OMIM 234500) is an autosomal recessive abnormality of renal and gastrointestinal neutral amino acid transport noted for its clinical variability. We localized a gene causing Hartnup disorder to chromosome 5p15.33 and cloned a new gene, SLC6A19, in this region. Read More

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September 2004
1 Read

Mutations in SLC6A19, encoding B0AT1, cause Hartnup disorder.

Nat Genet 2004 Sep 1;36(9):999-1002. Epub 2004 Aug 1.

Medical Genetics Branch, 10 Center Drive, MSC 1851, Building 10, Room 10C-107, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA.

Hartnup disorder, an autosomal recessive defect named after an English family described in 1956 (ref. 1), results from impaired transport of neutral amino acids across epithelial cells in renal proximal tubules and intestinal mucosa. Symptoms include transient manifestations of pellagra (rashes), cerebellar ataxia and psychosis. Read More

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September 2004
8 Reads

A clinicobiochemical study of tryptophan and other plasma and urinary amino acids in the family with Hartnup disease.

Adv Exp Med Biol 2003 ;527:325-35

Clinic for Neurology and Psychiatry for Children and Young People Dr Subotica 6a. 11000 Belgrade, Yugoslavia.

Two cases of Hartnup disease were diagnosed in a five member family. A changeable polymorph and severe clinical features of a 16 year old girl was described. Total plasma amino acids value was significantly decreased in the girl compared to the sum of plasma amino acids value in the brother, mother, father and to the summed maximal values of normal range. Read More

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September 2004
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Spontaneous scalp arteriovenous fistula in a child with hartnup disease.

J Endovasc Ther 2004 Jun;11(3):348-50

Department of Maxillo-Facial Surgery, Charité, Humboldt University, Berlin, Germany.

Purpose: To report the endovascular treatment of a spontaneous scalp arteriovenous fistula (AVF) in a child with Hartnup disease.

Case Report: A 6-year-old girl with Hartnup disease presented with recurrent attacks of intense, migraine-like, right-sided headache; a tender, pulsatile small mass was observed in the scalp. Selective digital subtraction angiography revealed a high-flow scalp AVF fed by the frontal branch of the right superficial temporal artery draining via the scalp veins. Read More

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June 2004
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Molecular cloning of mouse amino acid transport system B0, a neutral amino acid transporter related to Hartnup disorder.

J Biol Chem 2004 Jun 25;279(23):24467-76. Epub 2004 Mar 25.

School of Biochemistry and Molecular Biology, Australian National University, Canberra ACT 0200, Australia.

Resorption of amino acids in kidney and intestine is mediated by transporters, which prefer groups of amino acids with similar physico-chemical properties. It is generally assumed that most neutral amino acids are transported across the apical membrane of epithelial cells by system B(0). Here we have characterized a novel member of the Na(+)-dependent neurotransmitter transporter family (B(0)AT1) isolated from mouse kidney, which shows all properties of system B(0). Read More

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