Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Int J Mol Sci ; 22(15)2021 Jul 22.
Artigo em Inglês | MEDLINE | ID: mdl-34360576

RESUMO

Noncoding RNAs have been known to contribute to a variety of fundamental life processes, such as development, metabolism, and circadian rhythms. However, much remains unrevealed in the huge noncoding RNA datasets, which require further bioinformatic analysis and experimental investigation-and in particular, the coding potential of lncRNAs and the functions of lncRNA-encoded peptides have not been comprehensively studied to date. Through integrating the time-course experimentation with state-of-the-art computational techniques, we studied tens of thousands of zebrafish lncRNAs from our own experiments and from a published study including time-series transcriptome analyses of the testis and the pineal gland. Rhythmicity analysis of these data revealed approximately 700 rhythmically expressed lncRNAs from the pineal gland and the testis, and their GO, COG, and KEGG pathway functions were analyzed. Comparative and conservative analyses determined 14 rhythmically expressed lncRNAs shared between both the pineal gland and the testis, and 15 pineal gland lncRNAs as well as 3 testis lncRNAs conserved among zebrafish, mice, and humans. Further, we computationally analyzed the conserved lncRNA-encoded peptides, and revealed three pineal gland and one testis lncRNA-encoded peptides conserved among these three species, which were further investigated for their three-dimensional (3D) structures and potential functions. Our computational findings provided novel annotations and regulatory mechanisms for hundreds of rhythmically expressed pineal gland and testis lncRNAs in zebrafish, and set the stage for their experimental studies in the near future.


Assuntos
Ritmo Circadiano , Glândula Pineal/metabolismo , RNA Longo não Codificante/genética , Testículo/metabolismo , Transcriptoma , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra/genética , Animais , Biologia Computacional , Perfilação da Expressão Gênica , Masculino , Fragmentos de Peptídeos/química , Fragmentos de Peptídeos/genética , Fragmentos de Peptídeos/metabolismo , Peixe-Zebra/fisiologia , Proteínas de Peixe-Zebra/química , Proteínas de Peixe-Zebra/genética
2.
Int J Obes (Lond) ; 43(12): 2480-2490, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-30944420

RESUMO

OBJECTIVES: Aiming to uncover the genetic basis of abdominal obesity, we performed a genome-wide association study (GWAS) meta-analysis of trunk fat mass adjusted by trunk lean mass (TFMadj) and followed by a series of functional investigations. SUBJECTS: A total of 11,569 subjects from six samples were included into the GWAS meta-analysis. METHODS: Meta-analysis was performed by a weighted fixed-effects model. In silico replication analysis was performed in the UK-Biobank (UKB) sample (N = 331,093) and in the GIANT study (N up to 110,204). Cis-expression QTL (cis-eQTL) analysis, dual-luciferase reporter assay and electrophoresis mobility shift assay (EMSA) were conducted to examine the functional relevance of the identified SNPs. At last, differential gene expression analysis (DGEA) was performed. RESULTS: We identified an independent SNP rs12409479 at 1p21 (MAF = 0.07, p = 7.26 × 10-10), whose association was replicated by the analysis of TFM in the UKB sample (one-sided p = 3.39 × 10-3), and was cross-validated by the analyses of BMI (one-sided p = 0.03) and WHRadj (one-sided p = 0.04) in the GIANT study. Cis-eQTL analysis demonstrated that allele A at rs12409479 was positively associated with PTBP2 expression level in subcutaneous adipose tissue (N = 385, p = 4.15 × 10-3). Dual-luciferase reporter assay showed that the region repressed PTBP2 gene expression by downregulating PTBP2 promoter activity (p < 0.001), and allele A at rs12409479 induced higher luciferase activity than allele G did (p = 4.15 × 10-3). EMSA experiment implied that allele A was more capable of binding to unknown transcription factors than allele G. Lastly, DGEA showed that the level of PTBP2 expression was higher in individuals with obesity than in individuals without obesity (N = 20 and 11, p = 0.04 and 9.22 × 10-3), suggesting a regulatory role in obesity development. CONCLUSIONS: Taken together, we hypothesize a regulating path from rs12409479 to trunk fat mass development through its allelic specific regulation of PTBP2 gene expression, thus providing some novel insight into the genetic basis of abdominal obesity.


Assuntos
Cromossomos Humanos Par 1/genética , Obesidade Abdominal/genética , Polimorfismo de Nucleotídeo Único/genética , Idoso , Índice de Massa Corporal , Feminino , Perfilação da Expressão Gênica , Estudo de Associação Genômica Ampla , Humanos , Pessoa de Meia-Idade , Proteínas do Tecido Nervoso/análise , Proteínas do Tecido Nervoso/genética , Proteínas do Tecido Nervoso/metabolismo , Proteína de Ligação a Regiões Ricas em Polipirimidinas/análise , Proteína de Ligação a Regiões Ricas em Polipirimidinas/genética , Proteína de Ligação a Regiões Ricas em Polipirimidinas/metabolismo
3.
J Bone Miner Res ; 34(6): 1086-1094, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-30690781

RESUMO

Bone mineral density (BMD) at various skeletal sites have shared genetic determinants. In the present study, aiming to identify shared loci associated with BMD, we conducted a joint association study of a genomewide association study (GWAS) and a meta-analysis of BMD at different skeletal sites: (i) a single GWAS of heel BMD in 142,487 individuals from the UK Biobank, and (ii) a meta-analysis of 30 GWASs of total body (TB) BMD in 66,628 individuals from the Genetic Factors for Osteoporosis (GEFOS) Consortium. The genetic correlation coefficient of the two traits was estimated to be 0.57. We performed joint association analysis with a recently developed statistical method multi-trait analysis of GWAS (MTAG) to account for trait heterogeneity and sample overlap. The joint association analysis combining samples of up to 209,115 individuals identified 18 novel loci associated with BMD at the genomewide significance level (α = 5.0 × 10-8 ), explaining an additional 0.43% and 0.60% of heel-BMD and TB-BMD heritability, respectively. The vast majority of the identified lead SNPs or their proxies exerted local expression quantitative trait loci (cis-eQTL) activity. Credible risk variants, defined as those SNPs located within 500 kilobases (kb) of the lead SNP and with p values within two orders of magnitude of the lead SNP, were enriched in transcription factor binding sites (p = 3.58 × 10-4 ) and coding regions (p = 5.71 × 10-4 ). Fifty-six candidate genes were prioritized at these novel loci using multiple sources of information, including several genes being previously reported to play a role in bone biology but not reported in previous GWASs (PPARG, FBN2, DEF6, TNFRSF19, and NFE2L1). One newly identified gene, SCMH1, was shown to upregulate the expression of several bone biomarkers, including alkaline phosphatase (ALP), collagen type 1 (COL-I), osteocalcin (OCN), osteopontin (OPN), and runt-related transcription factor 2 (RUNX2), in mouse osteoblastic MC3T3-E1 cells, highlighting its regulatory role in bone formation. Our results may provide useful candidate genes for future functional investigations. © 2019 American Society for Bone and Mineral Research.


Assuntos
Densidade Óssea/genética , Loci Gênicos , Animais , Linhagem Celular , Cromossomos de Mamíferos/genética , Estudos de Associação Genética , Genoma , Camundongos , Proteínas do Grupo Polycomb/genética , Polimorfismo de Nucleotídeo Único/genética
4.
Cell Mol Life Sci ; 72(11): 2237-48, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25563487

RESUMO

As a peripheral tissue localized at the interface between internal and external environments, skin performs functions which are critical for the preservation of body homeostasis, in coordination with environmental changes. Some of these functions undergo daily variations, such as temperature or water loss, suggesting the presence of time-keeping mechanisms. Rhythmic functions are controlled by a network of circadian oscillators present virtually in every cell and coordinated by the central clock located in the suprachiasmatic nuclei. At the molecular level, circadian rhythms are generated by conserved transcriptional-translational feedback loops involving several clock genes, among which Per1 and Per2 play a central role. Here we characterize clock activity in skin of the transgenic Per1-luciferase rat during postnatal development and adulthood, by real-time recording of bioluminescence in explants and primary dermal fibroblasts, and report marked transformation in circadian properties, from early life to aging. Using primary dermal fibroblast cultures we provide evidence that melatonin treatment phase dependently increases the amplitude of circadian oscillations and that ambient temperature impacts on their period, with slight overcompensation. Together, these findings demonstrate that skin contains a self-sustained circadian clock undergoing age-dependent changes. Dermal fibroblasts, one of the major skin cell types, also exhibit robust, yet specific, circadian rhythmicity which can be fine-tuned by both internal (melatonin) and external (temperature) factors.


Assuntos
Relógios Circadianos/fisiologia , Ritmo Circadiano/fisiologia , Melatonina/farmacologia , Proteínas Circadianas Period/genética , Pele/metabolismo , Envelhecimento/fisiologia , Animais , Células Cultivadas , Fibroblastos/citologia , Fibroblastos/metabolismo , Regulação da Expressão Gênica , Humanos , Medições Luminescentes , Masculino , Ratos , Ratos Transgênicos , Pele/citologia , Temperatura
5.
AAPS J ; 11(3): 395-405, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19479387

RESUMO

Generations 5 and 6 (G5 and G6) poly(amidoamine) (PAMAM) dendrimers have been shown to be highly efficient nonviral carriers in in vitro gene delivery. However, their high toxicity and unsatisfied in vivo efficacy limit their applications. In this study, to improve their characteristics as gene delivery carriers, polyethylene glycol (PEG, molecular weight 5,000) was conjugated to G5 and G6 PAMAM dendrimers (PEG-PAMAM) at three different molar ratios of 4%, 8%, and 15% (PEG to surface amine per PAMAM dendrimer molecular). Compared with unconjugated PAMAM dendrimers, PEG conjugation significantly decreased the in vitro and in vivo cytotoxicities and hemolysis of G5 and G6 dendrimers, especially at higher PEG molar ratios. Among all of the PEG-PAMAM dendrimers, 8% PEG-conjugated G5 and G6 dendrimers (G5-8% PEG, G6-8% PEG) resulted in the most efficient muscular gene expression when polyplexes were injected intramuscularly to the quadriceps of neonatal mice. Consistent with the in vivo results, these two 8% PEG-conjugated PAMAM dendrimers could also mediate the highest in vitro transfection in 293A cells. Therefore, G5-8% PEG and G6-8% PEG possess a great potential for gene delivery both in vivo and in vitro.


Assuntos
Expressão Gênica/efeitos dos fármacos , Músculos/metabolismo , Poliaminas/farmacologia , Polietilenoglicóis/química , Transfecção , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Dendrímeros , Hemólise/efeitos dos fármacos , Humanos , Poliaminas/química
6.
Mini Rev Med Chem ; 8(9): 889-900, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18691146

RESUMO

Dendrimers as a new kind of polymer have been studied for medical applications mainly in two aspects: drug delivery and gene delivery. The unique characteristics, such as uniformity, monodispersity and the ability to functionalize their terminal groups with various targeting agents distinguish them as versatile carriers. In the paper the recent advances of dendrimer in gene transfer vehicles and drug delivery are separately reviewed. These advances illustrate the direction of the future development of dendrimers.


Assuntos
DNA/química , Dendrímeros/química , Portadores de Fármacos , Sistemas de Liberação de Medicamentos , RNA/química , Química Farmacêutica/métodos , Desenho de Fármacos , Técnicas de Transferência de Genes , Modelos Químicos , Poliaminas/química , Polímeros/química , Propriedades de Superfície , Tecnologia Farmacêutica/métodos , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...