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Human Dystrophia Myotonica-Protein Kinase (DMPK) interaction partners

1. We have developed an inducible, skeletal muscle-specific mouse model of DM1 (CUG960) that expresses 960 CUG repeat-expressing animals (CUG960) in the context of human DMPK exons 11-15.

2. The motor function (MRCSS and 6MWT) and CTG repeat length of DMPK significantly correlated with LV diastolic dysfunction in patients with myotonic dystrophy type 1.

3. Variant repeats might explain a part of the phenotypic variability in a small percent of myotonic dystrophy type 1 patients and likely display a stabilizing effect on the meiotic instability of DMPK expanded alleles

4. Haplotype analysis using various polymorphic-markers in proximity to DMPK gene indicates that a single founder mutation originates myotonic dystrophy type 1 in Mexico; however, Y-STR haplogroups data and the presence of pre-mutated and large normal alleles in Amerindians support the hypothesis that both European and Amerindian ancestral chromosomes might have introduced the disease to the Mexican population.

5. Patients with myotonic dystrophy type 1 (DM1) may have a slight decrease in renal function that cannot be explained by a higher occurrence of risk factors for renal failure such as diabetes, hypertension or age. In addition, there was no correlation between CTG repeats, a marker of disease severity, and renal function.

6. Interruptions within the DMPK expanded alleles could also interfere with the chromatin structure, the transcriptional activity of the Myotonic dystrophy type 1 (DM1) locus and the interaction with RNA CUG-binding proteins

7. A second point is that DM mutations, although located in noncoding regions, may reduce the expression of mutant alleles, raising questions whether loss-of-function may contribute to the phenotype, or possibly impose a safety limit on knockdown therapies that create or aggravate a DMPK or CNBP deficiency state

8. (CTG)>18 frequency of 3.60%, 1.57% and 4.00% in the Malay, Chinese and Indian subpopulations of Malaysia were discovered.

9. The patients with DM1 nucleotide expansion (CTG) mutation showed widespread abnormalities of all DTI parameters in the white matter, which were associated with reduced gray matter volume in all brain lobes and thinning in parieto-temporo-occipital cortices.

10. Our work suggests that DM1 patients are at risk for Fuchs' endothelial corneal dystrophy (FECD). DMPK mutations contribute to the genetic burden of FECD but are uncommon. We establish a connection between two repeat expansion disorders converging upon RNA-MBNL1 foci and FECD.

11. findings thus suggest that nuclear retention may be a common feature of regulation of DMPK RNA expression. The typical forced nuclear residence of expanded DMPK transcripts affects this regulation in tissues of DM1 patients, but not through hyperadenylation.

12. Data, including data from studies on synthetic RNA modeling RNA repeat expansions found in patients with Huntington's disease (mRNA for exon 1 of Huntingtin protein) and myotonic dystrophy type 1 (mRNA for 3prime untranslated region of dystrophia myotonica-protein kinase), suggest internal loops of r(3xCAG) are stabilized by one-hydrogen bond AA pairs, while those of r(3xCUG) prefer one- or two-hydrogen bond UU pairs.

13. Analysis of five intergenerational transmissions revealed a substantial intrafamilial stability of the DM1 mutation among relatives.

14. Methylation upstream of the expanded DMPK CTG repeat occurs exclusively with maternal transmission and that it is somehow linked to the development of congenital myotonic dystrophy.

15. Study shows DMPK expression with a complex pattern of tissue-specific epigenetics consistent with evidence that normal tissue require careful regulation of its RNA and protein levels which might include cis-acting regulatory elements in neighboring genes.

16. Sense DMPK RNA foci clearly co-localize with MBNL1 and MBNL2 proteins and accumulate in myotonic dystrophy 1 tissues during development.

17. This study supports the idea that genetic abnormalities in DM1mainly target the white matter, but gray matter involvement is also crucial in determining the clinical characteristics of myotonic dystrophy type 1.

18. that genome modification may be used to generate genetically modified progenitor cells as a first step toward autologous cell transfer therapy for Myotonic dystrophy type 1

19. miR-206 and miR-148a regulate the DMPK transcript and may functionally cooperate.

20. Three SNP loci (rs915915, rs1799894, and rs10415988) associated with a high chance of myotonic dystrophy in Yakut population.

Mouse (Murine) Dystrophia Myotonica-Protein Kinase (DMPK) interaction partners

1. We have developed an inducible, skeletal muscle-specific mouse model of DM1 (CUG960) that expresses 960 CUG repeat-expressing animals (CUG960) in the context of human DMPK exons 11-15.

2. Our results support the feasibility and safety of using antisense oligonucleotides for post-transcriptional silencing of DMPK in muscle and heart.

3. Sense DMPK RNA foci clearly co-localize with MBNL1 and MBNL2 proteins and accumulate in myotonic dystrophy 1 tissues during development.

4. The data of this study demonstrated that DMPK knockout mice present altered beta-agonist-induced responses and suggest that this is due, at least in part, to a reduced density of beta(1)-adrenergic receptors in cardiac plasma membranes.

5. Cytosolic DMPK participates in remodeling of the actomyosin cytoskeleton in developing skeletal muscle cells.

6. Muscleblind1, but not Dmpk or Six5, contributes to a complex phenotype of muscular and motivational deficits in mouse models of myotonic dystrophy

7. a tail-anchored myotonic dystrophy protein kinase isoform induces perinuclear clustering of mitochondria, autophagy, and apoptosis

8. Dmpk deficiency results in a sodium (Na) channel abnormality comprising frequent, long bursts of Na channel reopenings during sustained depolarization resulting in a plateau of non-inactivating late Na current.

9. DMPK has a modulatory role in the control of intracellular Ca2+ concentration in mouse ventricular cardiomyocytes, loss of which contributes to cardiac dysfunction in myotonic dystrophy.

10. role for DMPK in synaptic plasticity that could be relevant to the cognitive dysfunction associated with myotonic dystrophy

11. DMPK isoforms have cell-type and location dependent substrate specificities with a role in organellar and cytoarchitectural dynamics

12. Dmpk mRNA is expressed in a range of adult mouse tissues that including skeletal muscle, heart, smooth muscle, bone, testis, pituitary, brain, eye, skin, thymus,lung,intestinal epithelium, cartilage and liver.

13. DMPK phosphorylates phospholamban and regulates calcium uptake in cardiomyocyte sarcoplasmic reticulum

14. findings indicate that reduced DMPK expression may directly influence the onset of insulin-resistance in DM1 patients and point to dmpk as a new candidate gene for susceptibility to type 2-diabetes

15. increased CUGBP1 protein levels are associated with DMPK-CUG RNA expression

16. DM knockout macrophages infected with Mycobacterium tuberculosis in vitro were unable to stimulate pathogen-specific T cells.

17. Data show that during cardiac myocyte maturation, DMPK migrates from perinuclear to cellular membrane localization. Manipulating DMPK levels in cultured cardiac and skeletal myocytes has revealed a key role for DMPK in myocyte differentiation.

18. The cellular location of CUG RNA aggregates is an important variable that influences toxicity in myotonic dystrophy pathology.

19. high-fat fed DMPK knockout mice had significantly increased body weights, hypertrophic adipocytes and whole-body insulin resistance compared with wild-type mice.