Gene mutation in autism found to cause hyperconnectivity in brain's hearing center

New research from Cold Spring Harbor Laboratory (CSHL) might help explain how a gene mutation found in some autistic individuals leads to difficulties in processing auditory cues and paying spatial attention to sound.

The study has found that when a suspected autism gene called PTEN is deleted from auditory —the main workhorses of the brain's sound-processing center—the signals that these neurons receive from local as well as long-distance sources are strengthened beyond normal levels. These effects, the study shows, can be blocked by a drug currently in use as an immunosuppressant.

"It's long been hypothesized that autism spectrum disorders (ASDs) arise from a partial disruption of long-range connections in the brain during development," explains Professor Tony Zador, who led the study. "Our finding that PTEN-deficient neurons receive stronger inputs suggests that one way this disruption can be caused is by signal enhancement." His team's work appears in the Journal of Neuroscience on February 1.

Although ASDs could arise from mutations in any of dozens of candidate genes, a core triad of symptoms defines all cases: impaired language, impaired social interaction, and restricted and repetitive behaviors. "The challenge therefore has been to understand how this diverse set of candidate genes and the pathways they control converge to cause the common signature of ASDs," Zador says.

The auditory cortex, which plays a critical role in auditory attention and perception, forms functional connections with other sensory cortices and critical brain areas. The neural network within the auditory cortex has therefore been a target of studies aimed at understanding how alterations in neural circuits contribute to dysfunction in ASDs.

Zador's team focused for several reasons on the role of one suspected autism candidate gene, PTEN, on circuit alterations within the auditory cortex. Well known for its role as an anti-cancer gene that powers down cell growth, proliferation and survival, this gene has also been linked to ASDs by a slew of studies in humans and mice. PTEN mutations have been found in with extreme macroencephaly – an increase in brain volume. PTEN loss in mice has been found to boost cell size and the number of neuronal connections in the brain.

To decipher the role of PTEN on functional connectivity in the auditory cortex, Zador's group selectively disrupted the function of the PTEN gene in adult mice, only in a subset of neurons of the auditory cortex, while leaving the gene intact in neighboring neurons. The scientists then assessed the effect of the loss of PTEN on connectivity within the auditory cortex using techniques that involve stimulation by laser or flashes of blue light to trigger neuronal activity either locally or in other brain areas that send neuronal projections into the .

The rapid and robust increase in the strength of both long-range and local inputs observed following PTEN loss could possibly be explained by an increase that the scientists observed in the length and density of dendritic spines – the tiny, knob-like structures jutting out of a neuron that act like signal-receiving antennae.

These effects could be blocked, however, by chemically negating the effect of PTEN loss. One of the pathways regulated by the PTEN protein involves shutting down an intracellular enzyme called mTORC1, which promotes cell growth, among other things. Zador's group found that treating the PTEN-deficient mice for 10 days with the mTORC1-inhibitor rapamycin prevented an increase in dendritic spine number and signal strength.

While Zador is excited about "this finding that suggests that mTORC1 could be a good therapeutic target for some cases of PTEN-mediated brain disorders," he is also keen to further pursue his team's new evidence that cortical hyperconnectivity could be the "final pathway" by which diverse ASD genetic pathways lead to a single ASD phenotype. "Using cortical connectivity as a paradigm for assessing ASD candidate genes could provide insights into the mechanisms of the disorders and perhaps even give us clues to formulate new therapeutic strategies," he states.

More information: "PTEN regulation of local and long-range connections in mouse auditory cortex" appears in the Journal of Neuroscience on February 1.

Related Stories

Multiple genes implicated in autism

Feb 09, 2009

(PhysOrg.com) -- By pinpointing two genes that cause autism-like symptoms in mice, researchers at MIT’s Picower Institute for Learning and Memory have shown for the first time that multiple, interacting genetic risk factors ...

Protein identified as enemy of vital tumor suppressor PTEN

May 03, 2011

A protein known as WWP2 appears to play a key role in tumor survival, a research team headed by a scientist at The University of Texas MD Anderson Cancer Center reports in an advance online publication of Nature Cell Biology.

Recommended for you

Children with autism have extra synapses in brain

4 hours ago

Children and adolescents with autism have a surplus of synapses in the brain, and this excess is due to a slowdown in a normal brain "pruning" process during development, according to a study by neuroscientists ...

Learning to play the piano? Sleep on it!

6 hours ago

According to researchers at the University of Montreal, the regions of the brain below the cortex play an important role as we train our bodies' movements and, critically, they interact more effectively after ...

User comments