Guest Post by Amber Steele, University of Cambridge
There have been a couple of stories in the press recently touting a study by Joanna Spencer and colleagues suggesting that PMDD may be genetic. I had a cursory look through the paper and read the article. Changes in dendritic branching of neurons in the limbic system across the menstrual cycle, owing to changes in estrogen, has been well documented in the female mice and rat. Additionally, changes in neuronal activity and accompanying receptor activity is also well document during periods of hormone change, again in the female mice and rat models. Individual differences in how this change occurs and the fact that it can be linked to differences in genes make sense. It seems that Spencer et al., have identified one of probably many genes that mediates these differences. This is not the first time that a gene of this kind has been identified or implicated. For example, Susan Girdler at Chapel Hill has done some interesting work on PMDD and suggests a genetic i.e., differing protein response to a hormone, difference in response to progesterone that might, in part, explain symptoms associated with PMDD.
The fact that Spencer et al., found a relationship to anxious behavior does not say anything conclusively about PMS or PMDD. It only states that if you have this variant then your levels of anxiety may change as estrogen fluctuates.
The news article is exploiting the findings from the Spencer study to construct a simplistic view of varying responses to hormone change within and across women. I suppose the author of the news article thought it might be interesting to examine the debate on whether or not there is a “clinically disordered” state during the luteal phase of the menstrual cycle in some women and whether it should be recognized officially. While it may do this, it also perpetuates misunderstandings and stereotypes about women’s hormones and their emotional states.
Amber Steele is a graduate student at the University of Cambridge with a biomedical background. She is writing a thesis is on wellbeing over the menstrual cycle and how it relates to hormonal “biomarkers” cortisol and progesterone.
