Genome-wide identification, comparative analysis and functional roles in flavonoid biosynthesis of cytochrome P450 superfamily in pear (Pyrus spp.).

BACKGROUND: The cytochrome P450 (CYP) superfamily is the largest enzyme metabolism family in plants identified to date, and it is involved in many biological processes, including secondary metabolite biosynthesis, hormone metabolism and stress resistance. However, the P450 gene superfamily has not been well studied in pear (Pyrus spp.). RESULTS: Here, the comprehensive identification and a comparative analysis of P450 superfamily members were conducted in cultivated and wild pear genomes. In total, 338, 299 and 419 P450 genes were identified in Chinese white pear, European pear and the wild pear, respectively. Based on the phylogenetic analyses, pear P450 genes were divided into ten clans, comprising 48 families. The motif and gene structure analyses further supported this classification. The expansion of the pear P450 gene family was attributed to whole-genome and single-gene duplication events. Several P450 gene clusters were detected, which have resulted from tandem and proximal duplications. Purifying selection was the major force imposed on the long-term evolution of P450 genes. Gene dosage balance, subfunctionalization and neofunctionalization jointly drove the retention and functional diversification of P450 gene pairs. Based on the association analysis between transcriptome expression profiles and flavonoid content during fruit development, three candidate genes were identified as being closely associated with the flavonoid biosynthesis, and the expression of one gene was further verified using qRT-PCR and its function was validated through transient transformation in pear fruit. CONCLUSIONS: The study results provide insights into the evolution and biological functions of P450 genes in pear.

PearMODB: a multiomics database for pear (Pyrus) genomics, genetics and breeding study.

Pear (Pyrus ssp.) belongs to Rosaceae and is an important fruit tree widely cultivated around the world. Currently, challenges to cope with the burgeoning sets of multiomics data are rapidly increasing. Here, we constructed the Pear Multiomics Database (PearMODB) by integrating genome, transcriptome, epigenome and population variation data, and aimed to provide a portal for accessing and analyzing pear multiomics data. A variety of online tools were built including gene search, BLAST, JBrowse, expression heatmap, synteny analysis and primer design. The information of DNA methylation sites and single-nucleotide polymorphisms can be retrieved through the custom JBrowse, providing an opportunity to explore the genetic polymorphisms linked to phenotype variation. Moreover, different gene families involving transcription factors, transcription regulators and disease resistance (nucleotide-binding site leucine-rich repeat) were identified and compiled for quick search. In particular, biosynthetic gene clusters (BGCs) were identified in pear genomes, and specialized webpages were set up to show detailed information of BGCs, laying a foundation for studying metabolic diversity among different pear varieties. Overall, PearMODB provides an important platform for pear genomics, genetics and breeding studies. Database URL http://pearomics.njau.edu.cn.

Prenatal and postnatal management of congenital bronchial atresia (CBA): single tertiary center report.

OBJECTIVE: To summarize our diagnosis and management experience of congenital bronchial atresia (CBA). METHODS: A retrospective review was conducted, clinical data were collected of all patients with CBA. RESULTS: Among the nine patients (5 males and 4 females), six cases with right side and three cases with left cases, including one patient with mainstem bronchial atresia (MBA), two cases with lobar bronchial atresia (LBA), six cases with segmental bronchial atresia (SBA). Eight were diagnosed as congenital cystic adenomatoid malformation (CCAM) type III by ultrasound (US) in prenatal. The MBA patient was diagnosed by computed tomography (CT) and bronchofibroscopy, only two patients by pathological findings and the other six patients by CT. Five cases were accompanied by CCAM, one case with bronchopulmonary sequestration (BPS), two cases with emphysema. Eight cases except MBA were underwent thoracoscopic surgery treatment and had favorable prognosis. Two cases with LBA merged with complication of pectus excavatum after surgery. One case with MBA had no surgery and died in the 13 days old. CONCLUSIONS: CBA is an easily misdiagnosed disease from pathologic conditions, definitive diagnosis of this condition depends on combination CT or clinical pathologic diagnosis. Thoracoscopic resection is a safe and feasible treatment of CBA in experienced hands.

Radiobiological effect induced by different activities of (125)I seed brachytherapy in a hepatocellular carcinoma model.

BACKGROUND: Iodine 125 ((125)I) seed irradiation is an effective non-surgical treatment for unresectable hepatocellular carcinoma (HCC) patients. However, the safety and tolerability of (125)I seed sequential irradiation therapy remain unclear, there is no unified standard of brachytherapy radiation dose, and further study on the basic radiobiology of continuous rate irradiation is necessary. METHODS: Forty Kunming-mice (KM-mice, China) were injected with suspensions of human hepatocellular carcinoma cells (H22) to create an animal model and mimic (125)I seed implantation. The survival rates of mice, curative effect, pathological impairments including apoptosis and necrosis were investigated. The mice were randomly divided into four groups, A, B, C and D. In group A, 0.78 mCi (125)I seeds were implanted into the tumor focus. In groups B and C, 0.58 mCi and 0.38 mCi (125)I seeds were inserted at the same location, respectively. Group D was a control group, without any treatment. After 28 days of therapy, the survival rates and the tumor size were measured, and pathological impairments was measured by light or electron microscopy. RESULTS: The tumor volume inhibition rate was 68.21% ± 3.21%, 51.38% ± 4.96%, and 35.71% ± 2.79% after 0.78 mCi, 0.58 mCi, and 0.38 mCi (125)I seeds irradiation, respectively. However, radiation-related side effects were also observed in the high-dose group. Pathological results showed that radiation effect was closely associated with radiation dose, as the increase of radiation dose, an increase in apoptosis and necrosis was detected. Significant cellular impairments were noted by pathological analysis under electron microscopy. CONCLUSIONS: Our results demonstrate that the Kunming-mouse is an ideal animal to study (125)I brachytherapy, and the curative effect was closely associated with radiation dose. High-dose of brachytherapy may effectively increase apoptosis and necrosis in liver cells in KM-mice. A dose of 0.58 mCi (125)I radioactive particles may be a safe, effective and minimally invasive therapeutic option for liver cancer.