Epigenetic regulation of gene expression as a mechanism of nutritional programming and developmental origins of health and disease

一个人的饮食在人生的任何阶段都有重要的健康问题--毕竟，我们吃什么就是什么。然而，有证据表明，孕妇的饮食特别重要，因为它对后代的健康有重大的长期影响--所以，在某些方面，我们也是母亲在怀孕期间吃的东西。孕期营养不良的母亲所生的正常足月婴儿通常体重较低。研究表明，出生体重低的人不仅不太可能存活下来，而且在成年后患上各种常见疾病的风险也大大增加，如糖尿病、高血压和心脏病。早期发育不良与成年期疾病之间关系的根本原因尚不清楚，但我们认为，女性在怀孕期间的饮食质量至关重要。我们破译人类疾病机制的许多尝试既依赖于动物模型，也受益于动物模型。我们已经在啮齿动物模型中表明，如果怀孕的动物在怀孕期间蛋白质太少，它们的婴儿在出生时就很小，成年后就会患上糖尿病。我们已经确定了在胰腺中的重要基因，与对照动物相比，蛋白质限制母亲的后代表达水平较低。我们现在计划进一步研究这些动物，以了解限制饮食是如何能够扰乱糖尿病发病机制中关键基因的表达的。我们特别感兴趣的是研究表观遗传机制--即能够在不改变基因DNA序列的情况下改变基因活性的机制--这可能是由怀孕期间的营养变化引发的。我们也想更准确地知道，在什么时候/S怀孕期间，母亲的饮食质量对生下健康的宝宝最重要。这将使我们能够识别高危个人，并制定干预战略，以改善孕妇及其后代的健康。

The diet of an individual has important health issues at any stage of life - 'we are what we eat' after all. However, there is evidence to suggest that the diet of a pregnant woman is particularly important as it has major long-term implications on the health of her offspring - so, in some ways 'we also are what our mothers ate during pregnancy'. Normal term babies born from mothers with poor nutrition during pregnancy usually have a low weight. It has been shown that individuals with a low birth weight are not only less likely to survive delivery but are also at substantially increased risk of developing various common diseases such as diabetes, hypertension and heart disease in adulthood. The underlying causes of the relationship between poor early growth and disease in adulthood are not known, but we believe that the quality of the diet of women during pregnancy is critically important. Many of our attempts to decipher mechanisms of human diseases both rely and benefit from studying animal models. We have shown in a rodent model that if pregnant animals have too little protein during pregnancy their babies are small at birth and develop diabetes in adulthood. We have identified important genes in the pancreas that are expressed at low levels in the offspring of protein-restricted mothers compared to control animals. We now plan further to study these animals to understand how a restricted diet is able to perturb expression of key genes involved in pathogenesis of diabetes. We are particularly interested in studying epigenetic mechanisms - that is mechanisms able to change activity of a gene without altering its DNA sequence - that could be triggered by nutritional changes during pregnancy. We also want to know more precisely at which time/s during pregnancy the quality of the mother's diet is most important for giving birth to healthy babies. This will enable us to both identify at risk individuals and to develop intervention strategies to improve the health of both the pregnant women and their offspring.