NeuroD1: developmental expression and regulated genes in the rodent pineal gland.
NeuroD1/BETA2, a member of the bHLH transcription factor family, is known to influence the fate of specific neuronal, endocrine and retinal cells. We report here that NeuroD1 mRNA is highly abundant in the developing and adult rat pineal gland. Pineal expression begins in the 17-day embryo at which time it is also detectable in other brain regions. Expression in the pineal gland increases during the embryonic period and is maintained thereafter at levels equivalent to those found in the cerebellum and retina. In contrast, NeuroD1 mRNA decreases markedly in non-cerebellar brain regions during development. Pineal NeuroD1 levels are similar during the day and night, and do not appear to be influenced by sympathetic neural input. Gene expression analysis of the pineal glands from neonatal NeuroD1 knockout mice identifies 127 transcripts that are down-regulated (>twofold, p < 0.05) and 16 that are up-regulated (>twofold, p < 0.05). According to quantitative RT-PCR, the most dramatically down-regulated gene is kinesin family member 5C ( approximately 100-fold) and the most dramatically up-regulated gene is glutamic acid decarboxylase 1 ( approximately fourfold). Other impacted transcripts encode proteins involved in differentiation, development, signal transduction and trafficking. These findings represent the first step toward elucidating the role of NeuroD1 in the rodent pinealocyte.
Muñoz
Estela M
EM
Section on Neuroendocrinology, Office of the Scientific Director, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA.
Bailey
Michael J
MJ
Rath
Martin F
MF
Shi
Qiong
Q
Morin
Fabrice
F
Coon
Steven L
SL
Møller
Morten
M
Klein
David C
DC
D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics* / Q000378:metabolism; D001921:Brain / Q000196:embryology / Q000254:growth & development / Q000378:metabolism; D002940:Circadian Rhythm / Q000235:genetics; D015536:Down-Regulation / Q000235:genetics; D018507:Gene Expression Regulation, Developmental / Q000235:genetics*; D005968:Glutamate Decarboxylase / Q000378:metabolism; D016547:Kinesins / Q000235:genetics; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D010870:Pineal Gland / Q000196:embryology* / Q000254:growth & development* / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley
D051792:Basic Helix-Loop-Helix Proteins; D005968:Glutamate Decarboxylase; D016547:Kinesins; D012333:RNA, Messenger; C501008:Neurod1 protein, mouse; C514435:KIF5C protein, human