Nature vs nurture: Bees tell all
Wednesday, 03 November 2010
The Australian National University
The study represents a giant step closer to
solving the nature-nurture debate.
The nature-nurture debate is a “giant step” closer to being resolved after scientists studying bees documented how environmental inputs can modify our genetic hardware.
The research team was led by Professor Ryszard Maleszka of The Australian National University’s College of Medicine, Biology and Environment, working with colleagues from the German Cancer Institute in Heidelberg, Germany. Their work has uncovered the extensive molecular differences that occur in the brains of two types of genetically identical, but behaviourally different, female honey bees – worker bees and queen bees. The workers and queens develop along very different paths when put on different diets.
Their work reveals for the first time the intricacies of the environmentally-influenced chemical ‘marking of DNA’ called DNA methylation, which has the capacity to alter gene expression without affecting the genetic code – a process referred to as ‘epigenetic’, or above the genome.
“This marking determines which genes are to be fine-tuned in the brains of workers and queens to produce their extraordinarily different behaviours. This finding is not only crucial, but far reaching, because the enzymes that mark DNA in the bee are also the enzymes that mark DNA in human brains,” said Professor Maleszka.
“In the bees, more than 550 genes are differentially marked between the brain of the queen and the brain of the worker, which contributes to their profound divergence in behaviour. This study provides the first documentation of extensive molecular differences that may allow honey bees to generate different reproductive and behavioural outcomes as a result of differential feeding with royal jelly.”
Professor Maleszka said that the work goes a long way to answering one of life’s biggest questions.
“This study represents a giant step towards answering one of the big questions in the nature-nurture debate, because it shows how the outside world is linked to DNA via diet, and how environmental inputs can transiently modify our genetic hardware,” he said.
“Similar studies are impossible to do on human brains, so the humble honey bees are the pioneers in this fascinating area.”
The researchers’ paper, ‘The Honey Bee Epigenomes: Differential Methylation of Brain DNA in Queens and Workers’ is published in this week’s PLoS Biology.