Complex phenotype of mice homozygous for a null mutation in the Sp4 transcription factor gene.
BACKGROUND
Sp4 is a zinc finger transcription factor which is closely related to Sp1 and Sp3. All three proteins recognize the same DNA elements and can act as transcriptional activators through glutamine-rich activation domains. Unlike Sp1 and Sp3, which are ubiquitous proteins, Sp4 is highly abundant in the central nervous system, but also detectable in many other tissues.


RESULTS
We have disrupted the mouse Sp4 gene by a targeted deletion of the exons encoding the N-terminal activation domains. Sp4 knockout mice show a complete absence of Sp4 expression. They develop until birth without obvious abnormalities. After birth, two-thirds die within 4 weeks. Surviving mice are growth retarded. Male Sp4null mice do not breed. The cause for the breeding defect remains obscure since they show complete spermatogenesis. In addition, pheromone receptor genes in the vomeronasal organ appear unaffected. Female Sp4null mice have a smaller thymus, spleen and uterus. In addition, they exhibit a pronounced delay in sexual maturation.


CONCLUSIONS
The phenotype of the Sp4null mice differs significantly from those described for Sp1-/- and Sp3-/- mice. Thus, the structural similarities, the common recognition motif and the overlapping expression pattern of these three transcription factors do not reflect similar physiological functions.
Göllner
H
H
Institut für Molekularbiologie und Tumorforschung, Philipps-Universität Marburg, Germany.
Bouwman
P
P
Mangold
M
M
Karis
A
A
Braun
H
H
Rohner
I
I
Del Rey
A
A
Besedovsky
H O
HO
Meinhardt
A
A
van den Broek
M
M
Cutforth
T
T
Grosveld
F
F
Philipsen
S
S
Suske
G
G
D000483:Alleles; D000818:Animals; D002460:Cell Line; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D004622:Embryo, Mammalian / Q000378:metabolism; D005314:Embryonic and Fetal Development; D005260:Female; D018390:Gene Targeting; D006128:Growth / Q000502:physiology; D006130:Growth Disorders / Q000235:genetics; D006720:Homozygote; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009154:Mutation; D012098:Reproduction; D012741:Sexual Maturation / Q000502:physiology; D051706:Sp4 Transcription Factor; D014018:Tissue Distribution; D014157:Transcription Factors / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D016335:Zinc Fingers
D051706:Sp4 Transcription Factor; C497125:Sp4 protein, mouse; D014157:Transcription Factors; D004247:DNA