Mapping and Comparative Analysis of QTL for Rice Plant Height Based on Different Sample Sizes within a Single Line in RIL Population

To clarify the most appropriate sample size for obtaining phenotypic data for a single line,we investigated the main-effect QTL(M-QTL) of a quantitative trait plant height(ph) in a recombinant inbred line(RIL) population of rice(derived from the cross between Xieqingzao B and Zhonghui 9308) using five individual plants in 2006 and 2009.Twenty-six ph phenotypic datasets from the completely random combinations of 2,3,4,and 5 plants in a single line,and five ph phenotypic datasets from five individual plants were used to detect the QTLs.Fifteen M-QTLs were detected by 1 to 31 datasets.Of these,qph7a was detected repeatedly by all the 31 ph datasets in 2006 and explained 11.67% to 23.93% of phenotypic variation;qph3 was detected repeatedly by all the 31 datasets and explained 5.21% to 7.93% and 11.51% to 24.46% of phenotypic variance in 2006 and 2009,respectively.The results indicate that the M-QTL for a quantitative trait could be detected repeatedly by the phenotypic values from 5 individual plants and 26 sets of completely random combinations of phenotypic data within a single line in an RIL population under different environments.The sample size for a single line of the RIL population did not affect the efficiency for identification of stably expressed M-QTLs.

Reconstruction of the chest wall after resection of malignant peripheral nerve sheath tumor:A case report

BACKGROUND Malignant peripheral nerve sheath tumors(MPNSTs)are a group of rare and aggressive sarcomas that often arise from major peripheral nerves and represent a notable challenge to efficacious treatment.MPNSTs can occur in any body surface and visceral organs with nerve fiber distribution.The treatment options for MPNSTs include surgery,chemotherapy,and adjuvant radiotherapy.CASE SUMMARY A 26-year-old female cellist presented with chest pain on her left side when she squatted to lift the cello.One week later,a chest X-ray was performed and revealed fracture of the fourth rib on the left side.Three months later,the patient inadvertently touched a mass on the left side of the chest wall.Chest computed tomography(CT)three-dimensional reconstruction of the ribs revealed bone destruction of the fourth rib on the left side with a soft tissue mass shadow measuring 5.7 cm×3.7 cm.CT-guided puncture biopsy of the tumor showed that heterotypic cells(spindle cells)tended to be nonepithelial tumor lesions.PET-CT demonstrated bone destruction and a soft tissue mass with avid 18F-fluorodeoxyglucose activity(SUVmax7.5)in the left fourth rib.The tumor of the left chest wall was resected under general anesthesia,and reconstruction of the chest wall was performed.The postoperative pathological report exhibited an MPNST.CONCLUSION MPNSTs are relatively chemo-insensitive tumors.The mainstay of treatment for MPNSTs remains resection with tumor-free margins.