Adaptation insights from comparative transcriptome analysis of two Opisthopappus species in the Taihang mountains.

Opisthopappus is a major wild source of Asteraceae with resistance to cold and drought. Two species of this genus (Opisthopappus taihangensis and O. longilobus) have been employed as model systems to address the evolutionary history of perennial herb biomes in the Taihang Mountains of China. However, further studies on the adaptive divergence processes of these two species are currently impeded by the lack of genomic resources. To elucidate the molecular mechanisms involved, a comparative analysis of these two species was conducted. Among the identified transcription factors, the bHLH members were most prevalent, which exhibited significantly different expression levels in the terpenoid metabolic pathway. O. longilobus showed higher level of expression than did O. taihangensis in terms of terpenes biosynthesis and metabolism, particularly monoterpenoids and diterpenoids. Analyses of the positive selection genes (PSGs) identified from O. taihangensis and O. longilobus revealed that 1203 genes were related to adaptative divergence, which were under rapid evolution and/or have signs of positive selection. Differential expressions of PSG occurred primarily in the mitochondrial electron transport, starch degradation, secondary metabolism, as well as nucleotide synthesis and S-metabolism pathway processes. Several PSGs were obviously differentially expressed in terpenes biosynthesis that might result in the fragrances divergence between O. longilobus and O. taihangensis, which would provide insights into adaptation of the two species to different environments that characterized by sub-humid warm temperate and temperate continental monsoon climates. The comparative analysis for these two species in Opisthopappus not only revealed how the divergence occurred from molecular perspective, but also provided novel insights into how differential adaptations occurred in Taihang Mountains.

Transcriptional response of Thialkalivibrio versutus D301 to different sulfur sources and identification of the sulfur oxidation pathways.

The genus Thialkalivibrio plays an essential role in the biological desulfurization system. However, to date, the sulfur oxidation pathways of Thialkalivibrio are not clearly understood. Here, we performed transcriptomic analysis on Thialkalivibrio versutus D301 with either thiosulfate or chemical sulfur as the sulfur source to understand it. The results show that T. versutus D301 has a higher growth rate and sulfur oxidation activity when thiosulfate is utilized. The use of chemical sulfur as sulfur source leads to decreased expression of genes involved in carbon metabolism, ribosome synthesis and oxidative phosphorylation in T. versutus D301. Potentially due to the adsorption to sulfur particles, the genes related to flagellum assembly and motivation are significantly induced in T. versutus D301 in the presence of chemical sulfur. In the periplasm, both thiosulfate and polysulfide from the chemical sulfur are oxidized to sulfate via the similar truncated Sox system (SoxAXYZB). Then, part of polysulfide reached to cytoplasm through an unidentified route is oxidized to sulfite by the Dsr-like system. The sulfite in the cytoplasm is further catalyzed to sulfate by SoxB or SoeABC. Overall, the difference in the oxidation rates of D301 can be mainly attributed to the bioavailability of the two sulfur sources, not the sulfur oxidation pathways.

Genetic dissection of seedling vigour in a diverse panel from the 3,000 Rice (Oryza sativa L.) Genome Project.

Seedling vigour (SV) is important for direct seeding rice (Oryza sativa L.), especially in a paddy-direct seeding system, but the genetic mechanisms behind the related traits remain largely unknown. Here, we used 744 germplasms, having at least two subsets, for the detection of quantitative trait loci (QTLs) affecting the SV-related traits tiller number, plant height, and aboveground dry weight at three sampling stages, 27, 34, and 41 d after sowing. A joint map based on GAPIT and mrMLM produced a satisfying balance between type I and II errors. In total, 42 QTL regions, containing 18 (42.9%) previously reported overlapping QTL regions and 24 new ones, responsible for SV were detected throughout the genome. Four QTL regions, qSV1a, qSV3e, qSV4c, and qSV7c, were delimited and harboured quantitative trait nucleotides that are responsible for SV-related traits. Favourable haplotype mining for the candidate genes within these four regions, as well as the early SV gene OsGA20ox1, was performed, and the favourable haplotypes were presented with donors from the 3,000 Rice Genome Project. This work provides new information and materials for the future molecular breeding of direct seeding rice, especially in paddy-direct seeding cultivation systems.

Choriocarcinoma with multiple lung, skull and skin metastases in a postmenopausal female: A case report.

Gestational trophoblastic disease with a primary extra-uterine nidus is rare, particularly during the postmenopausal period. The present report outlines a case of high-risk choriocarcinoma (International Federation of Gynecology and Obstetrics stage IV; World Health Organization score 13) in a 68-year-old female exhibiting neoplasm. The choriocarcinoma developed 20 years subsequent to the onset of menopause and 42 years following the patient's final pregnancy, and was associated with multiple metastases to the lungs, skull, neck, lymph nodes and skin. The patient was administered two courses of systemic chemotherapy with tegafur (800 mg) and actinomycin D (200 µg). Local chemotherapy was also administered to the scalp and left flank masses; the masses were injected first with methotrexate, and then with 5-fluorouracil. During chemotherapy, the patient's levels of ß-human chorionic gonadotrophin (ß-HCG) decreased from 3,171 IU/l to 1,763 IU/l, however by the conclusion of the courses of systemic and local chemotherapy, ß-HCG levels had increased to 3,704 IU/l. The patient and their family subsequently elected to end treatment. The patient subsequently succumbed to infection, tumor consumption and organ insufficiency. This study describes the clinical and radiological features, as well as the treatment used for this rare type of choriocarcinoma.

Fertility-sparing partial hysterectomy for gestational trophoblastic neoplasia: an analysis of 36 cases.

OBJECTIVE: To evaluate the success of partial hysterectomy in treating gestational trophoblastic neoplasia (GTN) and preserving fertility. STUDY DESIGN: A retrospective review was conducted on 36 patients with GTN who underwent adjuvant fertility-sparing partial hysterectomy at the Department of Gynecologic Oncology, Women's Hospital, School of Medicine, Zhejiang University, China, between 1991 and 2008. RESULTS: Of 36 patients, 34 had fertility-sparing partial hysterectomy; 2 required full hysterectomy due to excessive bleeding during surgery. All women went into remission from their disease. Twenty-five subsequently achieved clinical pregnancy, resulting in a total of 23 live births. CONCLUSION: Partial hysterectomy with chemotherapy can be effective in treating GTN while preserving future fertility. This should be considered as an option for women who wish to pursue pregnancy in the future.