Gene expression profiling during cellular differentiation in the embryonic pituitary gland using cDNA microarrays.
The anterior pituitary is comprised of five major hormone-secreting cell types that differentiate during embryonic development in a temporally distinct manner. Microarrays containing 5,128 unique cDNAs expressed in the chicken neuroendocrine system were produced and used to identify genes with potential involvement in the onset of thyroid-stimulating hormone beta-subunit (TSHbeta), growth hormone (GH), and prolactin (PRL) mRNA during embryonic development. We identified 352 cDNAs that were differentially expressed (P < or = 0.05) on embryonic day 10 (e10), e12, e14, or e17, the period of thyrotroph, somatotroph, and lactotroph differentiation. Self-organizing maps were used to identify genes that may function to initiate hormone gene transcription. Consistent with cellular ontogeny, TSHbeta mRNA increased steadily between e10 and e17, GH mRNA increased between e12 and e17, and PRL mRNA did not increase until e17. Expression of 141 genes increased in a manner similar to TSHbeta mRNA, and 64 genes decreased between e10 and e17. Although genes with these expression profiles are likely involved in development of the pituitary gland as a whole, some of these could be specifically associated with thyrotroph differentiation. Similarly, the expression profiles of 69 and 61 genes indicate a potential involvement in the induction of GH and PRL mRNA, respectively. Quantitative real-time RT-PCR was used to confirm microarray results for 31 genes. This is the first study to evaluate changes in anterior pituitary gene expression during embryonic development of any species using microarrays, and numerous transcription factors and signaling molecules not previously implicated in pituitary development were identified.
Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland 20742, USA. teporter@umd.edu
Laura E
LE
Ellestad
Wilfrid
W
Carre
Michael
M
Muchow
Sultan A
SA
Jenkins
Xiaofei
X
Wang
Larry A
LA
Cogburn
Tom E
TE
Porter
D000818:Animals; D002454:Cell Differentiation / Q000235:genetics*; D002642:Chick Embryo; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D013006:Growth Hormone / Q000235:genetics / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D010903:Pituitary Gland, Anterior / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*; D011388:Prolactin / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D015203:Reproducibility of Results; D037322:Thyrotropin, beta Subunit / Q000235:genetics / Q000378:metabolism; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D037322:Thyrotropin, beta Subunit; D014157:Transcription Factors; D011388:Prolactin; D013006:Growth Hormone