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Abstract
The control of gene expression in reproductive tissues
involves a number of unique germ cell-specific
transcription factors. One such factor, ALF
(TFII
), encodes a protein similar to the large
subunit of general transcription factor TFIIA. To
understand how this factor is regulated, we characterized
transgenic mice that contain the ALF promoter linked to
either
-galactosidase or GFP reporters. The
results show that as little as 133 base pairs are
sufficient to drive developmentally-accurate and
cell-specific expression. Transgene DNA was methylated
and inactive in liver but could be reactivated in
vivo by systemic administration of 5-aza,
2'-deoxycytidine. Fluorescence activated cell sorting
allowed the identification of male germ cells that express
the GFP transgene and provides a potential method to
collect cells that might be under the control of a
non-somatic transcription system. Finally, we find that
transcripts from the endogenous ALF gene and derived
transgenes can also be detected in whole ovary and in
GV-stage oocytes of female mice. The ALF sequence falls
into a class of germ cell promoters whose features include
small size, high GC content, numerous CpG dinucleotides,
and an apparent TATA-like element. Overall, the results
define a unique core promoter that is active in both male
and female reproductive tissues and suggest mouse ALF may
have a regulatory role in male and female gametogenic gene
expression programs.
Key words:
Gamete Biology
Gametogenesis
Gene regulation
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