title: Identification of transcripts related to high egg production in the chicken hypothalamus and pituitary gland.
abstract: To identify transcripts related to high egg production expressed specifically in the hypothalamus and pituitary gland of the chicken, two subtracted cDNA libraries were constructed. Two divergently selected strains of Taiwan Country Chickens (TCCs), B (sire line) and L2 (dam line) were used; they had originated from a single population and were further subjected (since 1982) to selection for egg production to 40 wk of age and body weight/comb size, respectively. A total of 324 and 370 clones were identified from the L2-B (L2-subtract-B) and the B-L2 subtracted cDNA libraries, respectively. After sequencing and annotation, 175 and 136 transcripts that represented 53 known and 65 unknown non-redundant sequences were characterized in the L2-B subtracted cDNA library. Quantitative reverse-transcription (RT)-PCR was used to screen the mRNA expression levels of 32 randomly selected transcripts in another 78 laying hens from five different strains. These strains included the two original strains (B and L2) used to construct the subtracted cDNA libraries and an additional three commercial strains, i.e., Black- and Red-feather TCCs and Single-Comb White Leghorn (WL) layer. The mRNA expression levels of 16 transcripts were significantly higher in the L2 than in the B strain, whereas the mRNA expression levels of nine transcripts, BDH, NCAM1, PCDHA@, PGDS, PLAG1, PRL, SAR1A, SCG2 and STMN2, were significantly higher in two high egg production strains, L2 and Single-Comb WL; this indicated their usefulness as molecular markers of high egg production.
authors.affiliation: Institute of Biomedical Science, National Sun Yat-sen University, Kaohsiung, Taiwan.
authors.forename: Yow-Ling
authors.initials: YL
authors.lastname: Shiue
authors.forename: Lih-Ren
authors.initials: LR
authors.lastname: Chen
authors.forename: Chih-Feng
authors.initials: CF
authors.lastname: Chen
authors.forename: Yi-Ling
authors.initials: YL
authors.lastname: Chen
authors.forename: Jhy-Phen
authors.initials: JP
authors.lastname: Ju
authors.forename: Ching-Hsien
authors.initials: CH
authors.lastname: Chao
authors.forename: Yuan-Ping
authors.initials: YP
authors.lastname: Lin
authors.forename: Yu-Ming
authors.initials: YM
authors.lastname: Kuo
authors.forename: Pin-Chi
authors.initials: PC
authors.lastname: Tang
authors.forename: Yen-Pai
authors.initials: YP
authors.lastname: Lee
mesh_terms: D000818:Animals; D001835:Body Weight / Q000235:genetics; D002645:Chickens / Q000235:genetics* / Q000502:physiology*; D005260:Female; D005786:Gene Expression Regulation / Q000235:genetics; D015723:Gene Library; D007031:Hypothalamus / Q000737:chemistry*; D008297:Male; D010058:Oviposition / Q000235:genetics* / Q000502:physiology; D010902:Pituitary Gland / Q000737:chemistry*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000662:veterinary; D015398:Signal Transduction / Q000235:genetics; D013045:Species Specificity
chemical_list: D012333:RNA, Messenger