embryogenesis

胚胎发生
  • 文章类型: Journal Article
    BMP和活化素膜结合抑制剂(BAMBI)是一种跨膜糖蛋白,被称为TGFβ的假受体,as,虽然它的胞外结构域与I型TGFβ受体相似,其细胞内结构较短,缺乏丝氨酸/苏氨酸磷酸激酶信号基序。BAMBI可以调节许多生物学现象,包括葡萄糖和脂质代谢,炎症反应,细胞增殖和分化。此外,BAMBI在mRNA和蛋白质水平的异常表达有助于各种人类病理,包括肥胖和癌症.在本次审查中,简要介绍了BAMBI的结构,描述了其相关的信号通路和生理功能。了解BAMBI结构和功能可能有助于了解疾病的发生,包括肥胖和糖尿病,在其他人中。本综述为BAMBI作为潜在的生物标志物或治疗靶点的开发提供了理论基础。
    BMP and activin membrane-bound inhibitor (BAMBI) is a transmembrane glycoprotein, known as a pseudo-receptor for TGFβ, as, while its extracellular domain is similar to that of type I TGFβ receptors, its intracellular structure is shorter and lacks a serine/threonine phosphokinase signaling motif. BAMBI can regulate numerous biological phenomena, including glucose and lipid metabolism, inflammatory responses, and cell proliferation and differentiation. Furthermore, abnormal expression of BAMBI at the mRNA and protein levels contributes to various human pathologies, including obesity and cancer. In the present review, the structure of BAMBI is briefly introduced and its associated signaling pathways and physiological functions are described. Understanding of BAMBI structure and function may contribute to knowledge regarding the occurrence of diseases, including obesity and diabetes, among others. The present review provides a theoretical foundation for the development of BAMBI as a potential biomarker or therapeutic target.
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  • 文章类型: Journal Article
    这篇综述探讨了过量叶酸(维生素B9)摄入量之间的复杂关系,尤其是它的合成形式,即,叶酸,以及它对健康和疾病的影响。虽然叶酸在单碳循环中起着关键作用,这对DNA合成至关重要,修复,甲基化,人们担心它的过量摄入。文献强调了潜在的有害影响,如癌症发生的风险增加;DNA甲基化的破坏;以及对胚胎发生的影响,妊娠结局,神经发育,和疾病风险。值得注意的是,这些后果超出了直接影响,通过表观遗传重编程可能影响后代。研究了这些效应的分子机制,包括改变的一碳代谢,未代谢叶酸的积累,维生素B12依赖机制,改变的甲基化模式,以及与关键受体和信号通路的相互作用。此外,与天然叶酸相比,叶酸介导的作用和机制的差异被强调。鉴于广泛的叶酸补充剂,必须进一步研究其最佳摄入水平和受过量摄入影响的分子途径,确保全球人口的健康和福祉。
    This review delves into the intricate relationship between excess folate (vitamin B9) intake, especially its synthetic form, namely, folic acid, and its implications on health and disease. While folate plays a pivotal role in the one-carbon cycle, which is essential for DNA synthesis, repair, and methylation, concerns arise about its excessive intake. The literature underscores potential deleterious effects, such as an increased risk of carcinogenesis; disruption in DNA methylation; and impacts on embryogenesis, pregnancy outcomes, neurodevelopment, and disease risk. Notably, these consequences stretch beyond the immediate effects, potentially influencing future generations through epigenetic reprogramming. The molecular mechanisms underlying these effects were examined, including altered one-carbon metabolism, the accumulation of unmetabolized folic acid, vitamin-B12-dependent mechanisms, altered methylation patterns, and interactions with critical receptors and signaling pathways. Furthermore, differences in the effects and mechanisms mediated by folic acid compared with natural folate are highlighted. Given the widespread folic acid supplementation, it is imperative to further research its optimal intake levels and the molecular pathways impacted by its excessive intake, ensuring the health and well-being of the global population.
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  • 文章类型: Journal Article
    在雏鸡的胚胎和早期生命过程中,肠道形态和营养运输基因的调节会影响其整个生长期的体重和饲料转化率。可以通过测量绒毛形态和酶活性并确定营养转运蛋白基因的表达来监测肠发育。随着肠道发育和健康在肉鸡生产中的重要性日益提高,大量的研究已经针对影响肠道发育的因素。因此,本文综述了(1)胚胎发育过程中的肠道发育,(2)母性因素,在ovo管理中,和在胚胎发生过程中影响肠道发育的孵育条件。最后,(1)从较重的蛋的小鸡可能有一个更发达的肠道比从年轻的小鸡,(2)在卵中补充氨基酸,矿物,维生素或几种益生菌和益生元的组合刺激肠道发育并增加肠粘膜相关基因的表达;(3)长的储存期,不适当的培养温度和不平衡的通气会对肠道形态和营养转运蛋白基因表达产生负面影响。最后,了解胚胎发育过程中的肠道发育将使我们能够提高肉鸡的生产力。
    Intestinal morphology and regulation of nutrient transportation genes during the embryonic and early life of chicks influence their body weight and feed conversion ratio through the growing period. The intestine development can be monitored by measuring villus morphology and enzymatic activity and determining the expression of nutrient transporters genes. With the increasing importance of gut development and health in broiler production, considerable research has been directed towards factors affecting intestine development. Thus, this article reviews (1) intestinal development during embryogenesis, and (2) maternal factors, in ovo administration, and incubation conditions that influence intestinal development during embryogenesis. Conclusively, (1) chicks from heavier eggs may have a better-developed intestine than chicks from younger ones, (2) in ovo supplementation with amino acids, minerals, vitamins or a combination of several probiotics and prebiotics stimulates intestine development and increases the expression of intestine mucosal-related genes and (3) the long storage period, improper incubation temperature and imbalanced ventilation can negatively influence intestinal morphology and nutrient transporters gene expression. Finally, understanding the intestine development during embryonic life will enable us to enhance the productivity of broilers.
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  • 文章类型: Journal Article
    Chicken is one of the most widely consumed sources of protein globally. Primordial germ cells (PGCs) are the precursors for ova and sperm. One of the early embryogenesis events in most animals is the segregation of the somatic and germ lineages. PGC cultures occur in the germline, and PGCs are less studied in many species. It is relatively challenging to separate, cultivate, and genetically alter chicken without mutating the basic germline. The present study aims to gather previous research about chicken PGCs and provide a customized review of studies and developments in the field of PGCs, especially for avian species. Furthermore, we show that the propagation of chicken PGCs into embryonic germ cells that contribute to somatic tissues may be produced in vitro. Primordial germ cells offer an ideal system in developmental biology, as these cells play a vital role in the genetic modification and treatment of infertility. Cryopreservation helps to maintain genetic resources and sustainable production in the poultry industry. Keeping in mind the significance of cryopreservation for storage and gametogenesis, we discuss its role in the preservation of primordial germ cells. Transgenesis and genetic modifications in chicken lead to the development of various medicinal chicken varieties and aid in improving their production and quality for consumption purposes. Additionally, these characteristics open up new possibilities for modifying the chicken genome for agricultural and medical purposes.
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  • 文章类型: Journal Article
    Helianthus属包括52种和19个亚种,栽培的向日葵(HelianthusannuusL.)是世界上最重要的油料作物之一,这对于饲料和技术目的也很有价值。目前,向日葵育种的主要方向是生产高效杂种优势F1杂种,对生物和非生物胁迫的抗性增加。通过重复自花授粉生产近交系需要4-8年,商业混合动力的创建可能需要长达10年的时间。然而,使用双单倍体技术可以在一代中获得近交系,缩短混合生产所需的时间。此外,它允许野生Helianthus物种中存在的有价值的基因渗入栽培的向日葵。此外,这项技术可以操纵倍性水平,从而在种间杂交中恢复生育力。这篇综述系统化并分析了迄今为止使用雄性(分离的花药和小孢子培养物)和雌性(未授粉的卵巢和胚珠培养物)配子体生产单倍体和双单倍体Helianthus植物的知识,以及通过使用γ辐照的花粉和种间杂交诱导的孤雌生殖。遗传,生理,并考虑了影响单倍体植物生产效率的物理因素。一个特殊部分重点介绍了用于使单倍体染色体组加倍的方法以及确定倍性水平的直接和间接方法。总结了目前单倍体向日葵植物在育种中成功应用的分析数据。
    The genus Helianthus comprises 52 species and 19 subspecies, with the cultivated sunflower (Helianthus annuus L.) representing one of the most important oilseed crops in the world, which is also of value for fodder and technical purposes. Currently, the leading direction in sunflower breeding is to produce highly effective heterosis F1 hybrids with increased resistance to biotic and abiotic stresses. The production of inbred parental lines via repeated self-pollination takes 4-8 years, and the creation of a commercial hybrid can take as long as 10 years. However, the use of doubled haploid technology allows for the obtainment of inbred lines in one generation, shortening the time needed for hybrid production. Moreover, it allows for the introgression of the valuable genes present in the wild Helianthus species into cultivated sunflowers. Additionally, this technology makes it possible to manipulate the ploidy level, thereby restoring fertility in interspecific hybridization. This review systematizes and analyzes the knowledge available thus far about the production of haploid and dihaploid Helianthus plants using male (isolated anther and microspore cultures) and female (unpollinated ovaries and ovules culture) gametophytes, as well as by induced parthenogenesis using γ-irradiated pollen and interspecific hybridization. The genetic, physiological, and physical factors influencing the efficiency of haploid plant production are considered. A special section focuses on the approaches used to double a haploid chromosome set and the direct and indirect methods for determining the ploidy level. The current analyzed data on the successful application of haploid sunflower plants in breeding are summarized.
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  • 文章类型: Journal Article
    The number of sources of anthropogenic magnetic and electromagnetic fields generated by various underwater facilities, industrial equipment, and transferring devices in aquatic environment is increasing. These have an effect on an array of fish life processes, but especially the early developmental stages. The magnitude of these effects depends on field strength and time of exposure and is species-specific. We review studies on the effect of magnetic fields on the course of embryogenesis, with special reference to survival, the size of the embryos, embryonic motor function, changes in pigment cells, respiration hatching, and directional reactions. We also describe the effect of magnetic fields on sperm motility and egg activation. Magnetic fields can exert positive effects, as in the case of the considerable extension of sperm capability of activation, or have a negative influence in the form of a disturbance in heart rate or developmental instability in inner ear organs.
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  • 文章类型: Case Reports
    We report a patient with phenotypic semblance to the congenital microgastria-limb reduction association (MLRD). Our patient presented with microgastria, bilateral upper limb anomalies, asplenia, solitary kidney, and mild micrognathia. In addition to the anomalies seen in our patient, MLRD has been associated with respiratory, cardiovascular, and central nervous system anomalies. MLRD is thought to arise from a developmental field defect during embryonic weeks five and six; however, no genetic cause has been elucidated. Along with our patient presentation, we review the literature to further our understanding of the MLRD phenotype spectrum.
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  • 文章类型: Journal Article
    Homeobox genes function as master regulatory transcription factors during development, and their expression is often altered in cancer. The HOX gene family was initially studied intensively to understand how the expression of each gene was involved in forming axial patterns and shaping the body plan during embryogenesis. More recent investigations have discovered that HOX genes can also play an important role in cancer. The literature has shown that the expression of HOX genes may be increased or decreased in different tumors and that these alterations may differ depending on the specific HOX gene involved and the type of cancer being investigated. New studies are also emerging, showing the critical role of some members of the HOX gene family in tumor progression and variation in clinical response. However, there has been limited systematic evaluation of the various contributions of each member of the HOX gene family in the pathways that drive the common phenotypic changes (or \"hallmarks\") and that underlie the transformation of normal cells to cancer cells. In this review, we investigate the context of the engagement of HOX gene targets and their downstream pathways in the acquisition of competence of tumor cells to undergo malignant transformation and tumor progression. We also summarize published findings on the involvement of HOX genes in carcinogenesis and use bioinformatics methods to examine how their downstream targets and pathways are involved in each hallmark of the cancer phenotype.
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  • 文章类型: Journal Article
    Embryonic development and regeneration accomplish a remarkable feat: individual cells work together to create or repair complex anatomical structures. What is the source of the instructive signals that specify these invariant and robust organ-level outcomes? The most frequently studied source of morphogenetic control is the host genome and its transcriptional circuits. However, it is now apparent that significant information affecting patterning also arrives from outside of the body. Both biotic and physical factors, including temperature and various molecular signals emanating from pathogens, commensals, and conspecific organisms, affect developmental outcomes. Here, we review examples in which anatomical patterning decisions are strongly impacted by lateral signals that originate from outside of the zygotic genome. The endogenous pathways targeted by these influences often show transgenerational effects, enabling them to shape the evolution of anatomies even faster than traditional Baldwin-type assimilation. We also discuss recent advances in the biophysics of morphogenetic controls and speculate on additional sources of important patterning information which could be exploited to better understand the evolution of bodies and to design novel approaches for regenerative medicine.
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  • 文章类型: Journal Article
    Over the years, the potential toxicity of anesthetics has raised serious concerns about its safe use during pregnancy. As evidence emerged from research in animal models, showing that some anesthetic drugs are potential teratogenic, the determination of the risk of exposures to anesthetic drugs at early life stages became mandatory. However, due to inaccessibility and ethical constrains related to experimental conditions, the use of early life stages in mammalian models is limited. In this regard, some animal and nonanimal models have been suggested to surpass mammalian use in experimentation. Among them, the zebrafish embryo test has been recognized as a promising alternative in toxicology research, as well as an inexpensive and practical test. Substantial information collected from developmental research following compounds exposure, has contributed to the application of zebrafish assays in research, although only a few studies have focused on the use of early life stages of zebrafish to evaluate the developmental effects of anesthetics. Based on the recent advances of science and technology, there is a clear potential for zebrafish early life stages to provide new insights into anesthetics teratogenicity. This review provides an overview of recent anesthesia research using zebrafish embryos, demonstrating its usefulness to the anesthesia field, discussing the recent findings on various aspects related to the effects of anesthetics during early life development and the strengths and limitations of this model system.
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