Abstract:
:Menkes disease is an X-linked recessive copper deficiency disorder caused by mutations in the ATP7A (MNK) gene. The MNK gene encodes a copper-transporting P-type ATPase, MNK, which is localized predominantly in the trans-Golgi network (TGN). The MNK protein relocates to the plasma membrane in cells exposed to elevated copper where it functions in copper efflux. A role for MNK at the TGN in mammalian cells has not been demonstrated. In this study, we investigated whether the MNK protein is required for the activity of tyrosinase, a copper-dependent enzyme involved in melanogenesis that is synthesized within the secretory pathway. We demonstrate that recombinant tyrosinase expressed in immortalized Menkes fibroblast cell lines was inactive, whereas in normal fibroblasts known to express MNK protein there was substantial tyrosinase activity. Co-expression of the Menkes protein and tyrosinase from plasmid constructs in Menkes fibroblasts led to the activation of tyrosinase and melanogenesis. This MNK-dependent activation of tyrosinase was impaired by the chelation of copper in the medium of cells and after mutation of the invariant phosphorylation site at aspartic acid residue 1044 of MNK. Collectively, these findings suggest that the MNK protein transports copper into the secretory pathway of mammalian cells to activate copper-dependent enzymes and reveal a second copper transport role for MNK in mammalian cells. These findings describe a single cell-based system that allows both the copper transport and trafficking functions of MNK to be studied. This study also contributes to our understanding of the molecular basis of pigmentation in mammalian cells.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Petris MJ,Strausak D,Mercer JFdoi
10.1093/hmg/9.19.2845subject
Has Abstractpub_date
2000-11-22 00:00:00pages
2845-51issue
19eissn
0964-6906issn
1460-2083journal_volume
9pub_type
杂志文章abstract::Cytoglobin (CYGB) is frequently downregulated in many types of human malignancies, and its exogenous overexpression reduces proliferation of cancer cells. Despite its implied tumour suppressor (TSG) functions, its exact role in carcinogenesis remains unclear as CYGB upregulation is also associated with tumour hypoxia ...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddt174
更新日期:2013-08-15 00:00:00
abstract::Ryanodine receptor type I (RYR1)-related myopathies (RYR1 RM) are a clinically and histopathologically heterogeneous group of conditions that represent the most common subtype of childhood onset non-dystrophic muscle disorders. There are no treatments for this severe group of diseases. A major barrier to therapy devel...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddz105
更新日期:2019-09-15 00:00:00
abstract::Detailed knowledge of linkage disequilibrium (LD) is regarded as a prerequisite for population-based disease gene mapping. Variable patterns across the human genome are now recognized, both between regions and populations. Here, we demonstrate that LD may also vary within a genomic region in a haplotype-specific manne...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:
更新日期:2003-03-15 00:00:00
abstract::Although genetic variations in several genes encoding for synaptic adhesion proteins have been found to be associated with autism spectrum disorders, one of the most consistently replicated genes has been CNTNAP2, encoding for contactin-associated protein-like 2 (CASPR2), a multidomain transmembrane protein of the neu...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/dds320
更新日期:2012-11-01 00:00:00
abstract::Despite advancements in genetic studies, it is difficult to understand and characterize the functional relevance of disease-associated genetic variants, especially in the context of a complex multifactorial disease such as multiple sclerosis (MS). As a large proportion of expression quantitative trait loci (eQTLs) are...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddy001
更新日期:2018-03-01 00:00:00
abstract::Reduced sarcolemmal integrity in dystrophin-deficient muscles of mdx mice and Duchenne muscular dystrophy (DMD) patients has been reported to result in altered calcium homeostasis. Previous studies have shown a correlative relationship between calcium-dependent protease (calpain) activity in dystrophic muscle and musc...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/11.21.2645
更新日期:2002-10-01 00:00:00
abstract::A strong association between ERAP1 and ankylosing spondylitis (AS) was recently identified by the Wellcome Trust Case Control Consortium and the Australo-Anglo-American Spondylitis Consortium (WTCCC-TASC) study. ERAP1 is highly polymorphic with strong linkage disequilibrium evident across the gene. We therefore conduc...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddp371
更新日期:2009-11-01 00:00:00
abstract::X-linked Kallmann's syndrome (KS) is a genetic disease characterized by anosmia and hypogonadism due to impairment in the development of olfactory axons and in the migration of gonadotropin-releasing hormone (GnRH)-producing neurons. Deletions or point mutations of a gene located at Xp22.3 (KAL1) are responsible for t...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddh309
更新日期:2004-11-15 00:00:00
abstract::Two brothers presented with a clinical picture characterized by sideroblastic anemia, mild pancreatic insufficiency and progressive muscle weakness. The presence of an associated permanent basal lactic acidemia raised the suspicion of a mitochondrial disease. A muscle biopsy performed in both siblings proved the prese...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/3.11.1945
更新日期:1994-11-01 00:00:00
abstract::Primary aldosteronism (PA, autonomous aldosterone production from the adrenal cortex) causes the most common form of secondary arterial hypertension (HT), which is also the most common curable form of HT. Recent studies have highlighted an important role of mutations in genes encoding potassium channels in the pathoge...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/dds333
更新日期:2012-11-15 00:00:00
abstract::Selenoprotein N (SelN) deficiency causes a group of inherited neuromuscular disorders termed SEPN1-related myopathies (SEPN1-RM). Although the function of SelN remains unknown, recent data demonstrated that it is dispensable for mouse embryogenesis and suggested its involvement in the regulation of ryanodine receptors...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddq515
更新日期:2011-02-15 00:00:00
abstract::Paraspeckles are nuclear bodies formed by a set of specialized proteins assembled on the long non-coding RNA NEAT1; they have a role in nuclear retention of hyperedited transcripts and are associated with response to cellular stress. Fused in sarcoma (FUS) protein, linked to a number of neurodegenerative disorders, is...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddt622
更新日期:2014-05-01 00:00:00
abstract::The recently described DNA replication-based mechanisms of fork stalling and template switching (FoSTeS) and microhomology-mediated break-induced replication (MMBIR) were previously shown to catalyze complex exonic, genic and genomic rearrangements. By analyzing a large number of isochromosomes of the long arm of chro...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddr074
更新日期:2011-05-15 00:00:00
abstract::Limb girdle muscular dystrophy 2A is due to loss-of-function mutations in the Calpain 3 (CAPN3) gene. Our previous data suggest that CAPN3 helps to maintain the integrity of the triad complex in skeletal muscle. In Capn3 knock-out mice (C3KO), Ca2+ release and Ca2+/calmodulin kinase II (CaMKII) signaling are attenuate...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddw086
更新日期:2016-06-01 00:00:00
abstract::In mammals, sperm-oocyte fusion initiates Ca(2+) oscillations leading to a series of events called oocyte activation, which is the first stage of embryo development. Ca(2+) signaling is elicited by the delivery of an oocyte-activating factor by the sperm. A sperm-specific phospholipase C (PLCZ1) has emerged as the lik...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddv617
更新日期:2016-03-01 00:00:00
abstract::Peroxisome biogenesis disorders, including Zellweger syndrome (ZS), neonatal adrenoleukodystrophy (NALD) and infantile Refsum disease, are lethal hereditary diseases caused by abnormalities in peroxisomal assembly. To date, 12 genotypes have been identified. We now have evidence that the complete human cDNA encoding P...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/8.6.1077
更新日期:1999-06-01 00:00:00
abstract::Cerebrospinal fluid amyloid-beta 1-42 (Aβ1-42) and phosphorylated Tau at position 181 (pTau181) are biomarkers of Alzheimer's disease (AD). We performed an analysis and meta-analysis of genome-wide association study data on Aβ1-42 and pTau181 in AD dementia patients followed by independent replication. An association ...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddu372
更新日期:2014-12-15 00:00:00
abstract::Members of the peroxisome proliferator-activated receptor gamma coactivator (PGC) family are potent inducers of mitochondrial biogenesis. We have tested the potential effect of increased mitochondrial biogenesis in cells derived from patients harboring oxidative phosphorylation defects due to either nuclear or mitocho...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddp093
更新日期:2009-05-15 00:00:00
abstract::The molecular defects responsible for three cases of severe (type III) osteogenesis imperfecta (OI) were investigated. The mutation sites were localized in pro alpha 1(I) and pro alpha 2(I) mRNA molecules, respectively, by chemical cleavage of mismatch in heteroduplex nucleic acids. Mutation identification was achieve...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/3.12.2201
更新日期:1994-12-01 00:00:00
abstract::The huntingtin interacting protein (HIP1) is enriched in membrane-containing cell fractions and has been implicated in vesicle trafficking. It is a multidomain protein containing an N-terminal ENTH domain, a central coiled-coil forming region and a C-terminal actin-binding domain. In the present study we have identifi...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/10.17.1807
更新日期:2001-08-15 00:00:00
abstract::The HLA class II (DRB1 and DQB1) associations with sarcoidosis have been studied by several groups but often without consistent results. In this paper, we consider the hypothesis that observed inconsistencies relate to distinct, genetically encoded disease phenotypes which differ in prevalence between centres. We ther...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddq325
更新日期:2010-10-15 00:00:00
abstract::Serum total immunoglobulin E (IgE) is a critical intermediate phenotype of allergic diseases. Although total IgE exhibits sexual dimorphism in humans (with males demonstrating higher IgE than females), the molecular basis of this difference is unknown. A genome-wide scan of 380 short-tandem repeat (STR) markers was pe...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddl447
更新日期:2007-02-01 00:00:00
abstract::Filamin B (FLNB) is a cytoplasmic protein that regulates the cytoskeletal network by cross-linking actin, linking cell membrane to the cytoskeleton and regulating intracellular signaling pathways responsible for skeletal development (Stossel, T.P., Condeelis, J., Cooley, L., Hartwig, J.H., Noegel, A., Schleicher, M. a...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddm114
更新日期:2007-07-15 00:00:00
abstract::Polyglutamine diseases are a family of nine neurodegenerative disorders caused by expansion in different genes of a CAG triplet repeat stretch, which encodes an elongated polyglutamine tract. This polyglutamine tract is thought to confer a toxic gain of function to the bearing proteins, which leads to late onset and p...
journal_title:Human molecular genetics
pub_type: 杂志文章,评审
doi:10.1093/hmg/ddn412
更新日期:2009-04-15 00:00:00
abstract::The HMG-domain containing transcription factor Sox10 is essential for neural crest (NC) development and for oligodendrocyte differentiation. Heterozygous SOX10 mutations in humans lead to corresponding defects in several NC-derived lineages and to leukodystrophies. Disease phenotypes range from Waardenburg syndrome an...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddq124
更新日期:2010-06-15 00:00:00
abstract::Human embryo development occurs through a process that encompasses reprogramming, sequential cleavage divisions and mitotic chromosome segregation and embryonic genome activation. Chromosomal abnormalities may arise during germ cell and/or pre-implantation embryo development, and are a major cause of spontaneous misca...
journal_title:Human molecular genetics
pub_type: 杂志文章,评审
doi:10.1093/hmg/ddn170
更新日期:2008-04-15 00:00:00
abstract::Mutations of the novel renal glomerular genes NPHS1 and NPHS2 encoding nephrin and podocin cause two types of severe nephrotic syndrome presenting in early life, Finnish type congenital nephrotic syndrome (CNF) and a form of autosomal recessive familial focal segmental glomerulosclerosis (SRN1), respectively. To inves...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/11.4.379
更新日期:2002-02-15 00:00:00
abstract::PTEN, a tumor suppressor phosphatase that dephosphorylates both protein and lipid substrates, is mutated in both heritable and sporadic breast cancer. Until recently, PTEN-mediated cell cycle arrest and apoptosis were thought to occur through its well-documented cytoplasmic activities. We have shown that PTEN localize...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddl177
更新日期:2006-09-01 00:00:00
abstract::Tuberous sclerosis complex (TSC) is an autosomal dominant genetic disorder caused by mutations in either of two genes, TSC1 or TSC2, resulting in the constitutive activation of the mammalian target of rapamycin complex 1 (mTORC1). mTOR inhibitors are now considered the treatment of choice for TSC disease. A major path...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddx214
更新日期:2017-09-01 00:00:00
abstract::Rod and cone photoreceptors in mammalian retina are generated from common pool(s) of neuroepithelial progenitors. NRL, CRX and NR2E3 are key transcriptional regulators that control photoreceptor differentiation. Mutations in NR2E3, a rod-specific orphan nuclear receptor, lead to loss of rods, increased density of S-co...
journal_title:Human molecular genetics
pub_type: 杂志文章
doi:10.1093/hmg/ddl185
更新日期:2006-09-01 00:00:00