“This paper shows that we share a common genetic imprinting mechanism which has been active for about 150 million years despite the differences in reproductive strategies between marsupials and humans,” said Professor Geoffrey Shaw of the Department of Zoology at the University of Melbourne, a coauthor on the paper.
Professor Marilyn Renfree who lead the University of Melbourne research team says marsupials give birth to very small young that develop mainly within the pouch while humans have more developed young at birth that undergo a large period of growth in the uterus.
“Our team provided vital samples and genetic resources from marsupials to enable this study and contributed our world-leading expertise on marsupial biology and genomics to the interpretation of the results,” Professor Renfree said.
Genomic imprinting is a mechanism that regulates gene expression in the developing fetus and plays a major role in regulating its growth.
“We all carry two copies of every gene in our DNA, one inherited from our mother and one from our father. So for each gene we have a ‘back-up’. Normally, both copies of the gene are used for development, but in some special cases the gene from either our mother or father is switched off, so we only have one active copy. This phenomenon is known as genomic imprinting,” explained Dr Andrew Pask also from the Department of Zoology.
“Because there is no back up copy, when errors occur in this process, it results in many human genetic diseases mainly affecting growth and brain function.”
Pask explains that a key gene regulating fetal growth is the Insulin-like-growth-factor-2 or IGF2 which is an imprinted gene.
“We inherit a single working copy of this gene from our fathers, while the copy we inherit from our mothers is switched off. The switch for this gene is controlled by another gene known as H19. The H19 gene is unusual gene that makes a microRNA and not a protein.”
“MicroRNA genes have been sought in marsupials for years, and now for the first time one has been discovered,” Dr Pask said.
Pask explains that the microRNA structure is virtually identical to that of mice and humans, but there was no evidence of this gene or a similar microRNA in the more distantly related platypus.
The study was a large team effort involving researchers in the UK, from the Babraham Institute, the Sanger Institute and the University of Cambridge, in Australia, from the University of Melbourne, and the USA, from the University of Texas at San Antonio (all part of the Sequence Analysis of Vertebrate Orthologous Imprinted Regions ‘SAVOIR’ consortium).
“Understanding how genetic imprinting evolved is important,” said Dr Shaw, “It helps us to determine how the mechanism works and what we can do to avoid the development of a number of human diseases.”
For more information please contact:Dr Andrew Pask
Rebecca Scott | EurekAlert!
Bioenergy cropland expansion could be as bad for biodiversity as climate change
11.12.2018 | Senckenberg Forschungsinstitut und Naturmuseen
How glial cells develop in the brain from neural precursor cells
11.12.2018 | Universitätsmedizin der Johannes Gutenberg-Universität Mainz
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.
Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...
New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals
Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.
Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.
Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...
10.12.2018 | Event News
06.12.2018 | Event News
03.12.2018 | Event News
11.12.2018 | Physics and Astronomy
11.12.2018 | Materials Sciences
11.12.2018 | Information Technology