Synteny analysis of genes and distribution of loci controlling oil content and fatty acid profile based on QTL alignment map in Brassica napus

BMC Genomics

Research Article

Libin Zhang¹  Longjiang Yu¹  Nadia Raboanatahiry²  Hongbo Chao²  Maoteng Li²  Liangxing Guo²  Jun Xiang³  Jianping Gan³  Mingli Yan⁴ 

[1] Department of Biotechnology, College of Life Science and Technology, Key Laboratory of Molecular Biology, Huazhong University of Science and Technology, 430074, Wuhan, China;Department of Biotechnology, College of Life Science and Technology, Key Laboratory of Molecular Biology, Huazhong University of Science and Technology, 430074, Wuhan, China;Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Huanggang Normal University, 435599, Huanggang, China;Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Huanggang Normal University, 435599, Huanggang, China;School of Life Science, Hunan University of Science and Technology, 411201, Xiangtan, China;

关键词: Brassica napus;    QTL alignment map;    Seed oil alteration;    QTL;    Candidate genes;    Synteny;    Gene network interaction;    Metabolism pathway;   

DOI  :  10.1186/s12864-017-4176-6

 received in 2017-06-14, accepted in 2017-10-05,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundDeciphering the genetic architecture of a species is a good way to understand its evolutionary history, but also to tailor its profile for breeding elite cultivars with desirable traits. Aligning QTLs from diverse population in one map and utilizing it for comparison, but also as a basis for multiple analyses assure a stronger evidence to understand the genetic system related to a given phenotype.ResultsIn this study, 439 genes involved in fatty acid (FA) and triacylglycerol (TAG) biosyntheses were identified in Brassica napus. B. napus genome showed mixed gene loss and insertion compared to B. rapa and B. oleracea, and C genome had more inserted genes. Identified QTLs for oil (OC-QTLs) and fatty acids (FA-QTLs) from nine reported populations were projected on the physical map of the reference genome “Darmor-bzh” to generate a map. Thus, 335 FA-QTLs and OC-QTLs could be highlighted and 82 QTLs were overlapping. Chromosome C3 contained 22 overlapping QTLs with all trait studied except for C18:3. In total, 218 candidate genes which were potentially involved in FA and TAG were identified in 162 QTLs confidence intervals and some of them might affect many traits. Also, 76 among these candidate genes were found inside 57 overlapping QTLs, and candidate genes for oil content were in majority (61/76 genes). Then, sixteen genes were found in overlapping QTLs involving three populations, and the remaining 60 genes were found in overlapping QTLs of two populations. Interaction network and pathway analysis of these candidate genes indicated ten genes that might have strong influence over the other genes that control fatty acids and oil formation.ConclusionThe present results provided new information for genetic basis of FA and TAG formation in B. napus. A map including QTLs from numerous populations was built, which could serve as reference to study the genome profile of B. napus, and new potential genes emerged which might affect seed oil. New useful tracks were showed for the selection of population or/and selection of interesting genes for breeding improvement purpose.

【 授权许可】

CC BY   
© The Author(s). 2017