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Found in the developing brain: Mental health risk genes and gender differences

Date:
October 26, 2011
Source:
Yale University
Summary:
Most genes associated with psychiatric illnesses are expressed before birth in the developing human brain, a massive study has revealed. In addition, hundreds of genetic differences were found between males and females as their brains take shape in the womb.

Artist's depiction of neurons.
Credit: © nobeastsofierce / Fotolia

Most genes associated with psychiatric illnesses are expressed before birth in the developing human brain, a massive study headed by Yale University researchers discovered. In addition, hundreds of genetic differences were found between males and females as their brains take shape in the womb, the study in the Oct. 27 issue of the journal Nature shows.

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The creation of a hundred billion brain cells and the incalculable number of connections between them is such a complex task that 86 percent of 17,000 human genes studied are recruited in the effort. The study tracked not only what genes are involved in development, but where and when they are expressed, or activated.

"We knew many of the genes involved in the development of the brain, but now we know where and when they are functioning in the human brain," said Nenad Sestan, associate professor of neurobiology, researcher for the Kavli Institute for Neuroscience and senior author of the study. "The complexity of the system shows why the human brain may be so susceptible to psychiatric disorders."

The study identified genes expressed in the human brain, and when and where in the brain they were expressed in 1340 tissue samples taken from 57 subjects aged from 40 days after conception to 82 years. The analysis of 1.9 billion data points gives an unprecedented map of genetic activity in the brain at different stages of development. In dramatic fashion, the findings show just how much of the human brain is shaped prior to birth.

For instance, the team analyzed genes and variants previously linked with autism and schizophrenia, the symptoms of which are evident in the first few years of life or during early adulthood, respectively. The new analysis shows molecular evidence of expression of these suspect genes prior to birth.

"We found a distinct pattern of gene expression and variations prenatally in areas of the brain involving higher cognitive function," Sestan said. "It is clear that these disease-associated genes are developmentally regulated."

The team also looked for differences in brains of males and females. They expected to find clear differences in Y chromosome genes that are possessed only by males. However, they also demonstrated that men and women showed distinct differences in many genes that are shared by both sexes -- both in whether the gene was expressed and the level of the gene's activity. Most of the differences were noted prenatally.

Researchers from the Lieber Institute for Brain Development, National Institute of Mental Health, Virginia Commonwealth University, and Newcastle University contributed to the study.

Co-lead authors from Yale are Hyo Jung Kang, Yuka Imamura Kawasawa, Feng Cheng, Ying Zhu, Xuming Xu and Mingfeng, Other authors affiliated with Yale are Andrι M. M. Sousa, Mihovil Pletikos, Kyle A. Meyer, Goran Sedmak, Yurae Shin, Matthew B. Johnson, Zeljka Krsnik, Simone Mayer, Sofia Fertuzinhos, Sheila Alexander Vortmeyer, Shrikant Mane and Anita Huttner.


Story Source:

The above story is based on materials provided by Yale University. The original article was written by Bill Hathaway. Note: Materials may be edited for content and length.


Journal Reference:

  1. Hyo Jung Kang, Yuka Imamura Kawasawa, Feng Cheng, Ying Zhu, Xuming Xu, Mingfeng Li, Andrι M. M. Sousa, Mihovil Pletikos, Kyle A. Meyer, Goran Sedmak, Tobias Guennel, Yurae Shin, Matthew B. Johnson, Željka Krsnik, Simone Mayer, Sofia Fertuzinhos, Sheila Umlauf, Steven N. Lisgo, Alexander Vortmeyer, Daniel R. Weinberger, Shrikant Mane, Thomas M. Hyde, Anita Huttner, Mark Reimers, Joel E. Kleinman, Nenad Šestan. Spatio-temporal transcriptome of the human brain. Nature, 2011; 478 (7370): 483 DOI: 10.1038/nature10523

Cite This Page:

Yale University. "Found in the developing brain: Mental health risk genes and gender differences." ScienceDaily. ScienceDaily, 26 October 2011. <www.sciencedaily.com/releases/2011/10/111026143723.htm>.
Yale University. (2011, October 26). Found in the developing brain: Mental health risk genes and gender differences. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2011/10/111026143723.htm
Yale University. "Found in the developing brain: Mental health risk genes and gender differences." ScienceDaily. www.sciencedaily.com/releases/2011/10/111026143723.htm (accessed December 21, 2014).

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