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fertility and sterility

Xiaojie Yang, Yuanming Zhao, Deyi Xie, Yao Sun, Xunlu Zhu, Nardana Esmaeili, Zuoren Yang, Ye Wang, Guo Yin, Shuping Lv, Lihong Nie, Zhongjie Tang, Fu'an Zhao, Wu Li, Neelam Mishra, Li Sun, Wei Zhu, Weiping Fang
Hybrid vigor contributes in a large way to the yield and quality of cotton (Gossypium hirsutum) fiber. Although microRNAs play essential regulatory roles in flower induction and development, it is still unclear if microRNAs are involved in male sterility, as the regulatory molecular mechanisms of male sterility in cotton need to be better defined. In this study, two independent small RNA libraries were constructed and sequenced from the young buds collected from the sporogenous cell formation to the meiosis stage of the male sterile line Yu98-8A and the near-isogenic line...
October 7, 2016: International Journal of Molecular Sciences
Cintia A Oi, Jocelyn G Millar, Jelle S van Zweden, Tom Wenseleers
Social insects are known for their reproductive division of labor between queens and workers, whereby queens lay the majority of the colony's eggs, and workers engage mostly in non-reproductive tasks. Queens produce pheromones that signal their presence and fertility to workers, which in turn generally remain sterile. Recently, it has been discovered that specific queen-characteristic cuticular hydrocarbons (CHCs) function as queen pheromones across multiple lineages of social insects. In the common wasp, Vespula vulgaris, several long-chain linear alkanes and 3-methylalkanes were shown to act as queen signals...
October 8, 2016: Journal of Chemical Ecology
Inmaculada Moreno, Francisco M Codoñer, Felipe Vilella, Diana Valbuena, Juan F Martinez-Blanch, Jorge Jimenez-Almazán, Roberto Alonso, Pilar Alamá, Jose Remohí, Antonio Pellicer, Daniel Ramon, Carlos Simon
BACKGROUND: Bacterial cells in the human body account for 1-3% of total body weight and are at least equal in number to human cells. Recent research has focused on understanding how the different bacterial communities in the body (eg, gut, respiratory, skin, and vaginal microbiomes) predispose to health and disease. The microbiota of the reproductive tract has been inferred from the vaginal bacterial communities, and the uterus has been classically considered a sterile cavity. However, while the vaginal microbiota has been investigated in depth, there is a paucity of consistent data regarding the existence of an endometrial microbiota and its possible impact in reproductive function...
October 4, 2016: American Journal of Obstetrics and Gynecology
David K Turok, Lori M Gawron, Samantha Lawson
After decades of having the developed world's highest rates of unintended pregnancy, the United States finally shows signs of improvement. This progress is likely due in large part to increased use of highly effective long-acting reversible methods of contraception. These methods can be placed and do not require any maintenance to provide years of contraception as effective as sterilization. Upon removal, fertility returns to baseline rates. This article addresses advances in both software-improved use and elimination of barriers to provide these methods; and hardware-novel delivery systems and devices...
October 4, 2016: Fertility and Sterility
Kyoichi Sawamura, Hajime Sato, Chow-Yang Lee, Yoshitaka Kamimura, Muneo Matsuda
We surveyed natural population of the Drosophila ananassae species complex on Penang Island, Malaysia. Analyses of phenotypic traits, chromosome arrangements, molecular markers, and reproductive isolation suggest the existence of two species: D. ananassae and D. cf. parapallidosa. Molecular marker analysis indicates that D. cf. parapallidosa carries chromosome Y and 4 introgressions from D. ananassae. Thus, D. cf. parapallidosa seems to be a hybrid descendant that recently originated from a natural D. parapallidosa♀× D...
October 2016: Zoological Science
Y-W Sha, L Ding, J-X Wu, S-B Lin, X Wang, Z-Y Ji, P Li
Spermatozoa morphology, an important parameter in a semen specimen's potential fertility evaluation, is a significant factor for in vitro fertilisation in assisted reproductive technology. Eleven sterile men with headless spermatozoa, a type of human teratozoospermia, are presented. Their ejaculates' headless spermatozoa percentages were high with rare normal spermatozoa forms. Additionally, abnormal morphology (e.g. round-headed or microcephalic spermatozoa) was also found. Spermatozoa motility was somewhat affected, potentially because of the missing mitochondrial sheath at the sperm tail base...
October 6, 2016: Andrologia
Dorota Tchórzewska, Kamil Deryło, Krystyna Winiarczyk
Using a live-cell-imaging approach and autofluorescence-spectral imaging, we showed quantitative/qualitative fluctuations of chemical compounds within the meiocyte callose wall, providing insight into the molecular basis of male sterility in plants from the genus Allium. Allium sativum (garlic) is one of the plant species exhibiting male sterility, and the molecular background of this phenomenon has never been thoroughly described. This study presents comparative analyses of meiotically dividing cells, which revealed inhibition at the different microsporogenesis stages in male-sterile A...
September 29, 2016: Planta
(no author information available yet)
Cross-border reproductive care (CBRC) is a growing worldwide phenomenon, raising questions about why assisted reproductive technology (ART) patients travel abroad, what harms and benefits may result, and what duties health-care providers may have in advising and treating patients who travel for reproductive services. Cross-border care offers benefits and poses harms to ART stakeholders, including patients, offspring, providers, gamete donors, gestational carriers, and local populations in destination countries...
September 24, 2016: Fertility and Sterility
Xiaohong Yan, Xinhua Zeng, Shasha Wang, Keqi Li, Rong Yuan, Hongfei Gao, Junling Luo, Fang Liu, Yuhua Wu, Yunjing Li, Li Zhu, Gang Wu
Genic male sterility (GMS) has already been extensively utilized for hybrid rapeseed production. TE5A is a novel thermo-sensitive dominant GMS line in Brassica napus, however, its mechanisms of GMS remain largely unclear. Histological and Transmission electron microscopy (TEM) analyses of anthers showed that the male gamete development of TE5A was arrested at meiosis prophase I. EdU uptake of S-phase meiocytes revealed that the TE5A mutant could accomplish DNA replication, however, chromosomal and fluorescence in situ hybridization (FISH) analyses of TE5A showed that homologous chromosomes could not pair, synapse, condense and form bivalents...
September 27, 2016: Scientific Reports
Aiguo Su, Wei Song, Jinfeng Xing, Yanxin Zhao, Ruyang Zhang, Chunhui Li, Minxiao Duan, Meijie Luo, Zi Shi, Jiuran Zhao
S-type cytoplasmic male sterility (CMS-S) is the largest group among the three major types of CMS in maize. CMS-S exhibits fertility instability as a partial fertility restoration in a specific nuclear genetic background, which impedes its commercial application in hybrid breeding programs. The fertility instability phenomenon of CMS-S is controlled by several minor quantitative trait locus (QTLs), but not the major nuclear fertility restorer (Rf3). However, the gene mapping of these minor QTLs and the molecular mechanism of the genetic modifications are still unclear...
2016: PloS One
Laura Valerio, Ace North, C Matilda Collins, John D Mumford, Luca Facchinelli, Roberta Spaccapelo, Mark Q Benedict
The persistence of transgenes in the environment is a consideration in risk assessments of transgenic organisms. Combining mathematical models that predict the frequency of transgenes and experimental demonstrations can validate the model predictions, or can detect significant biological deviations that were neither apparent nor included as model parameters. In order to assess the correlation between predictions and observations, models were constructed to estimate the frequency of a transgene causing male sexual sterility in simulated populations of a malaria mosquito Anopheles gambiae that were seeded with transgenic females at various proportions...
2016: Insects
Marta Biedka, Tamara Kuźba-Kryszak, Tomasz Nowikiewicz, Agnieszka Żyromska
Infertility as a result of antineoplastic therapy is becoming a very important issue due to the growing incidence of neoplastic diseases. Routinely applied antineoplastic treatments and the illness itself lead to fertility disorders. Therapeutic methods used in antineoplastic treatment may cause fertility impairment or sterilization due to permanent damage to reproductive cells. The risk of sterilization depends on the patient's sex, age during therapy, type of neoplasm, radiation dose and treatment area. It is known that chemotherapy and radiotherapy can lead to fertility impairment and the combination of these two gives an additive effect...
2016: Contemporary Oncology Współczesna Onkologia
C Wang, J Cao, Y Xing, D Pu, J Liu, J Wu
OBJECTIVE: It has previously been reported that TATA-binding protein 2 (TBP2) knockout female mice are sterile. Our objective was to assess the association between the TBP2 gene and primary ovarian insufficiency (POI) in a Chinese population. METHODS: A cohort of 60 POI patients matched with 60 fertile controls was recruited by Nanjing Medical University. There were no interventions. The complete TBP2 exon regions were analyzed by direct sequencing in all POI patients and controls...
September 17, 2016: Climacteric: the Journal of the International Menopause Society
Kim Linh Nguyen, Hoang Anh Nguyen, Otto Richter, Minh Thinh Pham, Van Phuoc Nguyen
Many mangrove forests have suffered from the contaminated environments near industrial areas. This study addresses the question how these environments influence the renewal of mangrove forests. To this end ecophysiological responses of the young mangrove species Rhizophora apiculata (Blume) grown under combinations of the factors heavy metals (here chromium), nutrition and soil/water environment were analyzed. We tested the hypothesis that soil/water conditions and nutrient status of the soil strongly influence the toxic effect of chromium...
September 15, 2016: Science of the Total Environment
Andrea L Case, Findley R Finseth, Camille M Barr, Lila Fishman
Intraspecific coevolution between selfish elements and suppressors may promote interspecific hybrid incompatibility, but evidence of this process is rare. Here, we use genomic data to test alternative models for the evolution of cytonuclear hybrid male sterility in Mimulus In hybrids between Iron Mountain (IM) Mimulus guttatus × Mimulus nasutus, two tightly linked M. guttatus alleles (Rf1/Rf2) each restore male fertility by suppressing a local mitochondrial male-sterility gene (IM-CMS). Unlike neutral models for the evolution of hybrid incompatibility loci, selfish evolution predicts that the Rf alleles experienced strong selection in the presence of IM-CMS...
September 14, 2016: Proceedings. Biological Sciences
Felipe A Navarrete, Antonio Alvau, Hoi Chang Lee, Lonny R Levin, Jochen Buck, Patricia Martin-De Leon, Celia M Santi, Dario Krapf, Jesse Mager, Rafael A Fissore, Ana M Salicioni, Alberto Darszon, Pablo E Visconti
Mammalian sperm acquire fertilizing capacity in the female tract in a process called capacitation. At the molecular level, capacitation requires protein kinase A activation, changes in membrane potential and an increase in intracellular calcium. Inhibition of these pathways results in loss of fertilizing ability in vivo and in vitro. We demonstrated that transient incubation of mouse sperm with Ca(2+) ionophore accelerated capacitation and rescued fertilizing capacity in sperm with inactivated PKA function...
2016: Scientific Reports
Fangyuan Zhou, Guodong Zhu, Haipeng Zhao, Zheng Wang, Ming Xue, Xianxian Li, Huaqiang Xu, Xiaodan Ma, Yanyan Liu
The onion maggot, Delia antiqua, is a devastating pest of liliaceous crops and current control measures fail to avert pesticide residues, threats to agroecosystem, and costly expenditures. Insect growth regulators (IGRs) are used as trypetid pest chemosterilants for their suppression on adult fertility and fecundity, but their effects on onion flies are unknown. Here, three IGRs (lufenuron, cyromazine, pyriproxyfen) were incorporated into baits to evaluate their effects on onion fly survival, fecundity, fertility, susceptibility of adults in different ages and offspring development...
2016: Scientific Reports
A Mark Cigan, Manjit Singh, Geoffrey Benn, Lanie Feigenbutz, Manish Kumar, Myeong-Je Cho, Sergei Svitashev, Joshua Young
Targeted mutagenesis using programmable DNA endonucleases has broad applications for studying gene function in planta and developing approaches to improve crop yields. Recently, a genetic method that eliminates the need to emasculate the female inbred during hybrid seed production, referred to as Seed Production Technology, has been described. The foundation of this genetic system relied on classical methods to identify genes critical to anther and pollen development. One of these genes is a P450 gene which is expressed in the tapetum of anthers...
September 10, 2016: Plant Biotechnology Journal
Fabrizio Balestrino, Diana P Iyaloo, Khouaildi B Elahee, Ambicadutt Bheecarry, Francesco Campedelli, Marco Carrieri, Romeo Bellini
Aedes albopictus (Skuse) is one of the most invasive mosquito species capable of transmitting various harmful pathogens to humans. Failure of vector control strategies against this species requires the development of new effective vector control methods. Among the alternative genetic control measures under development, the sterile insect technique (SIT) is today receiving a renewed interest as a possible effective tool to be integrated in an area-wide pest management approach. The monitoring of the abundance, distribution, movements and ratio of released sterile and wild fertile males is a fundamental requirement for the successful management of any pest control activities integrating an SIT component...
September 5, 2016: Acta Tropica
Susana Manzano, Zoraida Megías, Cecilia Martínez, Alicia García, Encarnación Aguado, Tarik Chileh, Diego López-Alonso, Federico García-Maroto, Eduard Kejnovský, Jiří Široký, Zdeněk Kubát, Tereza Králová, Boris Vyskot, Manuel Jamilena
Sex determination in Rumex acetosa, a dioecious plant with a complex XY1 Y2 sex chromosome system (females are XX and males are XY1 Y2 ), is not controlled by an active Y chromosome but depends on the ratio between the number of X chromosomes and autosomes. To gain insight into the molecular mechanisms of sex determination, we generated a subtracted cDNA library enriched in genes specifically or predominantly expressed in female floral buds in early stages of development, when sex determination mechanisms come into play...
September 6, 2016: Plant Journal: for Cell and Molecular Biology
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