Research group of Dr. Mihaela Žigman

The levels, chemical modifications, and relative abundance of biomolecules that circulate in systemic bioliquids like human blood are a direct indicator of the physiological states of many organs within our body. Capitalizing on the broadband optics, ultrafast sources, and precision femtosecond-attosecond field-resolving metrologies of attoworld, we develop electric-field molecular fingerprinting (EMF) as a new analytical technique. Overcoming limitations of sampling depth and sensitivity inherent to existing omics technologies, EMF is capable of describing the entire ensemble of biomolecules, even in highly complex matrices like blood plasma. In strategic partnership with the Center for Molecular Fingerprinting (CMF), we work towards advancing EMF to an approach suited for high-throughput human populational screening enabling a robust novel route for health state monitoring and earliest possible disease detection, as described in our Just Cause

electric-field molecular fingerprinting (EMF)

to explore new avenues to probe human health and disease

Due to pervasive connectivity at each level of regulation in our body (from genetic networks to cell-cell signaling to interactions with the environment), health as well as disease manifest as complex coinciding changes to all types of molecular classes – including proteins, lipids, nucleic acids, carbohydrates, metabolites. As EMF sensitively and robustly reports on all types of chemical bonds, it provides a molecular description of physiological phenotypes in their entirety. Measuring blood, whose chemical composition mirrors – to a significant extent – the cell functions in many tissues of our body, we develop EMF as a novel minimally-invasive tool for biomedicine.

a new approach – how could one possibly apply it?

Infrared vibrational spectroscopy analyzes electric fields originating from vibrations of the covalent bonds within molecules of the sample under investigation. During EMF, the entire molecular ensemble is probed within a single measurement, whereby the frequencies of laser pulse-induced vibrations vary depending on the exact atomic composition, structure, and strength of the chemical bonds in the individual molecules. Because infrared fingerprinting is inherently sensitive to all functional groups of organic compounds, it is well suited to probe biomolecules, which are often large and carry chemically complex modifications.

The EMF represents a highly characteristic, sensitive cross-molecular snapshot with many fine-grained features. We take advantage of machine learning algorithms to analyze patterns in these features and correlate these with person-specific medical, clinical, and lifestyle information. Eventually, EMF serves for in vitro detection of any physiological or pathological phenotype that leaves a molecular trace in the cell-free fraction of our blood.

where are we heading to?

We are specifically evaluating the feasibility of taking (and eventually molecularly understanding) electric-field molecular fingerprints as phenotypic snapshots for:

  • effective cross-sectional high-throughput populational screening – to establish patterns of spectral changes characteristic to specific phenotypes – health and disease;
  • assessing earliest transitions from health to disease by repeated measurements of individuals over time, longitudinally in a personalized way.

For example, during onco-infrared-phenotyping, we test the applicability of EMF for screening and diagnosis of common cancers as a complementary in vitro diagnostic tool in real-life clinical settings.

our standpoint

At the crossroads.
By integrating the latest advances from ultrafast sources, and precision attosecond, femtosecond field-resolving metrologies with principles from molecular biology, medicine, epidemiology and machine learning, we aim for a direct practical impact on health state monitoring and disease diagnostics.

spectral profiling of human physiologies

broadband infrared diagnostics: Quantitative cross-molecular electric-field fingerprinting of human biofluids based on highly sensitive femtosecond laser vibrational spectroscopy aims at new avenues to assess human health and disease. Design: Dennis Luck

tools, techniques & laboratories

  • We exploit the potential of electric-field molecular spectroscopy to acquire molecular fingerprints of biological samples that contain highly complex, yet phenotype-specific mixtures of organic molecules. The ultrafast light sources and precision femtosecond field-resolving metrologies are being developed and continuously extended in our laboratories at attoworld.

  • We probe biological samples in their native, hydrated, liquid phase (blood serum, plasma, exprimate urine, living cells, plant tissues, etc.). The approach operates in a label-free manner, thereby obviating the need for complex biochemical sample preparation. To make the practical workflow as effective as possible, we are combining electric-field spectroscopy with microfluidic sample delivery systems – to be using as little sample volume as possible, and rendering it as high-throughput as possible.

  • Along with the development of the technology to measure samples, we have also established a cryogenic repository for the best long-term storage of biological materials, opening the possibility to measure and re-measure sample sets with ever higher sensitivity and specificity, as new generations of fingerprinting spectrometers are being developed.

  • To facilitate the highest control over reproducibility and to eliminate possible confounding effects of sample preparation in real life outside the research lab (e.g. in medical clinics), we have worked out standard operating procedures along which we are, together with our clinical collaborating partners, running several clinical studies (for more information, please visit Laser4Life).

  • Due to the complexity of patterns in the newly acquired electric-field spectra (the fingerprints), new ways of data processing and exploration are required, and we apply a diverse set of machine learning algorithms to build classifier models that facilitate phenotype detection.

interested in joining in?

We are always on the look for bright minds that wish to share their passion with us.

If you are a student or a laser scientist, a specialist in molecular sciences, a physician, a nurse, an engineer, or a data analyst – if you share the motivation to devise new approaches for quantifying the molecules of life to improve human health – do get in touch with us!

Contact:
Dr. Mihaela Žigman
Email: mihaela.zigman@mpq.mpg.de

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    Molecular biology lab.

  • Actively growing and dividing living cells deep within an intact organ (laser scanning confocal micrograph of a double transgene: cell nuclei marked in cyan, cell membranes marked in red)

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