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p57Kip2 (cdkn1c): sequence, splice variants and unique temporal and spatial expression pattern in the rat pancreas
Tamara Potikha1, Sameer Kassem, Esther P Haber
1Endocrinology and Metabolism Service, Internal Medicine Department, Hadassah-Hebrew University Medical School, Jerusalem, Israel.
Summary
The cyclin-dependent kinase (CDK) inhibitor p57Kip2 (CDKN1C) regulates cell proliferation. Its expression pattern in the rat pancreas differs significantly from humans, suggesting distinct roles in beta-cell mass control.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- p57Kip2 (CDKN1C) is a CDK inhibitor that negatively regulates cell proliferation.
- It is maternally expressed in terminally differentiated cells, including human beta-cells.
- Loss of p57Kip2 is linked to increased beta-cell proliferation in Hyperinsulinism of Infancy.
Purpose of the Study:
- To clone and sequence the rat ortholog of p57Kip2.
- To investigate the expression profile of p57Kip2 during rat development.
- To compare the functional significance of p57Kip2 in human and rodent pancreas.
Main Methods:
- Cloning and sequencing of the rat p57Kip2 gene.
- Analysis of p57Kip2 gene homology between species.
- Evaluation of p57Kip2 expression during rat fetal and postnatal development.
Main Results:
- The rat p57Kip2 gene is highly homologous to the mouse ortholog but divergent from the human gene, particularly in the mid-portion.
- p57Kip2 exhibits a cell-specific, temporal, and spatial expression pattern during rat development.
- Rat pancreas shows high p57Kip2 expression in exocrine cells, with no expression in beta-cells, contrasting with human expression patterns.
Conclusions:
- p57Kip2 expression is tightly regulated.
- The functional role of p57Kip2 in the pancreas differs between humans and rodents.
- Understanding these differences may offer insights into human beta-cell mass regulation.