Maternal synchronization of gestational length and lung maturation

Area of Science:

• Perinatal biology
• Developmental biology
• Genetics

Background:

• Fetal organ maturation must synchronize with gestation for optimal survival.
• Pulmonary immaturity is a primary cause of preterm infant mortality.
• The influence of fetal and maternal genotypes on gestation length and lung function is unclear.

Purpose of the Study:

• To investigate the impact of fetal and maternal genotypes on the relationship between gestational length and lung function at birth.
• To determine if maternal genotype controls gestational length and influences fetal lung maturation.

Main Methods:

• Comparison of pulmonary maturity indicators in two mouse strains with differing gestational lengths.
• Ovarian transplantation experiments between mouse strains.
• Assessment of gene expression related to perinatal lung function in transferred fetuses.

Main Results:

• Shorter gestation in C57BL/6J mice correlated with advanced pulmonary development and improved survival compared to A/J pups.
• Ovarian transfer to C57BL/6J dams resulted in earlier birth and survival for A/J pups.
• Maternally induced lung maturation involved the selective induction of specific mRNAs, implicating transcription factors C/EBPα and CREB.

Conclusions:

• Fetal lung maturation is influenced by both fetal and maternal genotypes.
• Maternal genotype dictates gestational timing and can modulate fetal lung development for enhanced perinatal survival.