Harald Janovjak Bends Cells and Receptors to His Will

The 38-year-old synthetic biologist comes from a long line of tinkerers and engineers.

Oct 1, 2017
Aggie Mika

© STEFAN FUERTBAUERWhen Harald Janovjak filed his first patent describing the cell growth–regulating receptors he had engineered to be activated by light, he stumbled upon his great-grandfather’s 1920 patent for a device that projected color onto movie screens. Janovjak comes from an impressive line of engineers stretching back four generations. But he says he was pleasantly surprised to find that nearly a century later, “we’re still tinkering with light-based things.”

As a child growing up in Switzerland, Janovjak was always building things with his father. “We would inherit bicycles from my uncles or my older cousins, and we would take them apart and modify them.” The acumen he developed for disassembling things, tweaking them, and putting them back together has served him well as a synthetic physiologist.

Janovjak embarked on a career in science as a third-year undergraduate at the University of Basel, after a survey course in biophysics introduced him to microscopist Daniel Müller. In his lab, Müller had pioneered an imaging technique using atomic force microscopy “to visualize single membrane proteins in their native membranes,” says Janovjak. He was hooked, and recalls begging Müller for a spot on his team.

Janovjak’s drive as a graduate student impressed Müller, who is now at ETH Zurich. “He was really burning for what he was doing; it was incredible,” says Müller. “He never stopped thinking about the science.” Janovjak’s graduate work centered on developing methods to better understand how membrane proteins fold and stabilize. To study protein dynamics, “We had to do quite a bit of method development,” Janovjak recalls. In one of the ten papers Janovjak published during his two and a half years in graduate school, he characterized the energy necessary to stabilize a bacteriorhodopsin protein by assessing the amount of force it takes to break it apart.1

Müller identifies Janovjak’s key strength as a talent for distilling complex biological phenomena into manageable queries. “[Biologists] don’t often see the trees in the forest,” says Müller. “Harald has no problem understand[ing] very complex theory or biological scenarios—and condensing [them] to a very simple question.”

In 2006, Janovjak moved stateside to do a postdoc in the University of California, Berkeley, lab of Ehud Isacoff. By combining genetic components from viruses, bacteria, and rodents, the two engineered a “Frankenstein” version of a light-controlled excitatory glutamate receptor, but with a twist: they converted it into an inhibitory receptor, making it suppress, rather than excite, neuronal activity.2

Harald was “the kind of person you want to have as a postdoc,” says Isacoff. “Smart and disciplined and not afraid of anything.”

As a principal investigator at the Institute of Science and Technology Austria in Klosterneuburg, Janovjak has developed methods aimed at commandeering cell growth using light.3 His group is taking cells that aren't light responsive and reengineering them to grow using light-activated growth receptors. While the possibilities are vast, he aims to apply this technology to regenerate specific cell populations in diseases caused by cell death, such as type 1 diabetes and Parkinson’s.

Janovjak recently accepted a position at the Australian Regenerative Medicine Institute at Monash University, where he will move this December. “We think we have an amazing environment for our work,” he says. “The goal has to be that we keep pushing this until we end up with something that is to the benefit of people.” 


  1. H. Janovjak et al., “Probing the energy landscape of the membrane protein bacteriorhodopsin,” Structure, 12:871-79, 2004.
  2. (Cited 86 times)
  3. H. Janovjak et al., “A light-gated, potassium-selective glutamate receptor for the optical inhibition of neuronal firing,” Nature Neurosci, 13:1027-32, 2010. (Cited 94 times)
  4. M. Grusch et al., “Spatio-temporally precise activation of engineered receptor tyrosine kinases by light,” EMBO, 33:1713-26, 2014. (Cited 55 times)

January 2019

Cannabis on Board

Research suggests ill effects of cannabinoids in the womb


Sponsored Product Updates

WIN a VIAFLO 96/384 to supercharge your microplate pipetting!
WIN a VIAFLO 96/384 to supercharge your microplate pipetting!
INTEGRA Biosciences is offering labs the chance to win a VIAFLO 96/384 pipette. Designed to simplify plate replication, plate reformatting or reservoir-to-plate transfers, the VIAFLO 96/384 allows labs without the space or budget for an expensive pipetting robot to increase the speed and throughput of routine tasks.
FORMULATRIX® digital PCR technology to be acquired by QIAGEN
FORMULATRIX® digital PCR technology to be acquired by QIAGEN
FORMULATRIX has announced that their digital PCR assets, including the CONSTELLATION® series of instruments, is being acquired by QIAGEN N.V. (NYSE: QGEN, Frankfurt Stock Exchange: QIA) for up to $260 million ($125 million upfront payment and $135 million of milestones).  QIAGEN has announced plans for a global launch in 2020 of a new series of digital PCR platforms that utilize the advanced dPCR technology developed by FORMULATRIX combined with QIAGEN’s expertise in assay development and automation.
Application of CRISPR/Cas to the Generation of Genetically Engineered Mice
Application of CRISPR/Cas to the Generation of Genetically Engineered Mice
With this application note from Taconic, learn about the power that the CRISPR/Cas system has to revolutionize the field of custom mouse model generation!
Translational Models of Obesity, Dysmetabolism, Diabetes, and Complications
Translational Models of Obesity, Dysmetabolism, Diabetes, and Complications
This webinar, from Crown Bioscience, presents a unique continuum of translational dysmetabolic platforms that more closely mimic human disease. Learn about using next-generation rodent and spontaneously diabetic non-human primate models to accurately model human-relevant disease progression and complications related to obesity and diabetes here!