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Developmental gene expression in the human fetal pancreas
M I Mally1, T Otonkoski, A D Lopez
1Lucy Thorne Whittier Children's Center, Whittier Institute for Diabetes and Endocrinology, La Jolla, California 92037.
Pediatric Research
|October 1, 1994
Summary
This study quantitatively analyzes human fetal pancreas gene expression, finding distinct developmental patterns for insulin, glucagon, and glucose transporters, crucial for understanding beta-cell function. These findings reveal insights into the molecular basis of fetal pancreas development and glucose sensing.
Area of Science:
- Endocrinology
- Developmental Biology
- Molecular Genetics
Background:
- Limited data exists on differential developmental regulation of pancreas-specific genes in the human fetal pancreas.
- Understanding gene expression patterns is crucial for elucidating pancreas development and function.
Purpose of the Study:
- To systematically and quantitatively analyze transcriptional levels of various genes in the human pancreas during fetal and postnatal development.
- To investigate the developmental regulation of key genes involved in endocrine and exocrine pancreas function.
Main Methods:
- Ribonuclease protection assays
- In situ hybridization
- Polymerase chain reaction (PCR)
Main Results:
- Insulin and amylin mRNA levels are lower in fetal than adult pancreas; glucagon and somatostatin mRNA levels are higher post-14 weeks gestation.
- The reg gene shows a 20-fold mRNA increase after 16 weeks gestation, exclusively in acinar cells.
- Glucose transporter 2 (GLUT2) and glucokinase mRNA are detected early (13 weeks gestation) but remain low; Glucose transporter 1 (GLUT1) reaches adult levels by 18 weeks gestation.
Conclusions:
- Differential gene expression patterns observed in the fetal pancreas suggest distinct developmental trajectories for endocrine and exocrine components.
- The early presence of GLUT2 and glucokinase suggests fetal beta-cell glucose insensitivity is not due to a lack of these glucose sensor genes.
- The reg gene's restricted exocrine expression indicates it does not directly influence islet development.