The impact of murine strain and sex on postnatal development after maternal dietary restriction during pregnancy.

The objective of this study was to characterize offspring responses to maternal dietary restriction (DR) in two phylogenetically distant strains of mice: A/J and C57BL/6J (B6). Pregnant mice were fed 100% or 70% of ad libitum between 6.5 and 17.5 days (d) gestation. Offspring were fed 100% ad libitum postweaning. All comparisons were made to strain and sex matched controls. Male DR-B6 offspring initially grew slower than controls; however, by 77 d and 182 d they were significantly heavier (P<0.05). Further, they had an increase percentage fat mass (+70%, P<0.01) by 182 d and were glucose intolerant at both 80 d (P<0.001) and 186 d (P<0.05). In contrast, weight, %Fat mass and glucose tolerance in DR-A/J males during postnatal life were not different from controls. Female DR-B6 mice showed catch-up growth during the first 77 d of life; however, their weight, %Fat mass and glucose tolerance were not different from controls at 80 d and 186 d. Although female DR-A/J were heavier than controls at 182 d (P<0.05), their %Fat mass and glucose tolerance were not different from controls at 182 d and 186 d. The observed strain and sex differences offer a unique opportunity to begin to define gene-environment interactions that contribute to developmental origins of health and disease.