Molecular Human Reproduction, Vol. 6, No. 12, 1131-1139,
December 2000
© 2000 European Society of Human Reproduction and Embryology
Pregnancy |
Uterine expression of alternatively spliced mRNAs of mouse splicing factor SC35 during early pregnancy
1 Prince Henry's Institute of Medical Research, P.O. Box 5152, Clayton, Victoria 3168, Australia
Abstract
RNA differential display was applied to identify genes critical for the establishment of pregnancy in the mouse. One of the gene fragments identified was homologous to human SC35 splicing factor; the mouse counterpart had not then been cloned. To obtain the full cDNA sequence of the mouse gene, a cDNA library was screened and four positive clones were fully analysed. Sequencing analysis indicated that we had cloned alternatively spliced mRNA species of mouse SC35 splicing factor. A map of splicing structure for this gene's pre-mRNA was then proposed and region-specific mRNA species were tested on Northern blots. This analysis indicated that the overall expression level of SC35 mRNA was much higher in implantation sites than in inter-implantation sites in the mouse uterus during early pregnancy. The expression of alternatively spliced mRNAs for SC35 was differently regulated both during early pregnancy and by steroid hormones. Embryo-derived factors were also implicated in the up-regulation of SC35 mRNA at implantation sites. These results demonstrate, for the first time, that an essential splicing factor is regulated in a complex manner during implantation in the mouse uterus. Hence, its correct regulation could be important for the success of pregnancy.
implantation/mouse/pregnancy/RNA differential display/SC35 splicing factor
Notes
2 Current address: Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China
3 To whom correspondence should be addressed at: Prince Henry's Institute of Medical Research P.O. Box 5152, Clayton, Victoria 3168, Australia. E-mail: guiying.nie{at}med.monash.edu.au
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