We use cookies to improve your experience on our Website. We need cookies to continuously improve the services, to enable certain features and when embedding services or content of third parties, such as video player. By using our website, you agree to the use of cookies. We use different types of cookies. You can personalize your cookie settings here:

Show detail settings
Please find more information in our privacy statement.

There you may also change your settings later.

Research for a Future
without Diabetes

10 years translational
Diabetes research at the DZD

„Research for a future without diabetes – this is the mission of the DZD that inspires and unites us.“

Prof. Martin Hrabě de Angelis, DZD board member

Research for a Future
without Diabetes

10 years translational
Diabetes research at the DZD

„The Germany-wide cooperation in the DZD ensures that multicenter studies can be carried out with the required number of participants.“

Prof. Michael Roden, DZD board member

Research for a Future
without Diabetes

10 years translational
Diabetes research at the DZD

„The DZD places particular importance on the fast transfer of lab results to patient care.“

Prof. Michele Solimena, DZD speaker

10 years translational
Diabetes research at the DZD

„The special feature of research at the DZD is the close interdisciplinary cooperation between different disciplines.“

Prof. Annette Schuermann, DZDSpeaker

DZD - German Center
for Diabetes Research

Neuherberg, 14.02.2019

The Lypla1 Gene Impacts Obesity in a Sex-Specific Manner

Susceptibility to obesity, insulin resistance and other cardio-metabolic traits may also be dependent on a person’s sex. An international research team of the University of California (UCLA), Helmholtz Zentrum München, a partner of the DZD, and Ludwig-Maximilians-Universität München studied sex differences and sex-specific interaction with the genetic background in cardio-metabolic phenotypes. The researchers discovered, among other things, a sex-specific obesity locus of the Lypla1 gene, which is associated with human obesity. The results of the study have now been published in Cell Metabolism.

Men and women may be differently susceptible to obesity, insulin resistance, and other cardio-metabolic traits. Women often have more advantageous metabolic profiles. This has been described for mice but also for humans. But how does sex interact with genes? What role does natural genetic variance play? And how does this affect the development of cardio-metabolic traits? In order to answer these questions, an international team of researchers used an animal model (hybrid mouse diversity panel) to search for sex-specific differences in 50 cardio-metabolic traits. The effect of sex on cardio-metabolic traits was investigated in terms of sex-specific correlations with specific disease phenotypes, their genetic architecture and the underlying expression networks in fat and liver. It was found that sex – depending on the genetic background – plays a role in gene expression and the development of cardio-metabolic traits. The research team discovered a sex-specific obesity locus for the Lyplal1 gene.

"In addition, we were able to show that there is sex-specific regulation for the “beiging” of white adipose tissue* and sex-specific interactions for mitochondrial function," said UCLA Professor Aldons J. Lusis, last author and head of the study. The study showed that females have a higher mitochondrial activity and produce more brown adipose tissue ("beiging"). This reduces fat mass and insulin resistance. In males, the interaction between genes and sex tends to lead to low mitochondrial activity and low beiging. Weight and insulin resistance increase.

"In the reference literature there are already indications of major differences in adipose biology between sexes also in humans. This study provides insights into the depth and breadth of sex differences in metabolism. We believe that our results provide compelling evidence as to why males and females in biological research should be treated as distinct organisms as a whole, rather than attempting to reconcile these differences one molecule at a time," said DZD researcher Professor Susanna Hofmann, MD of the Institute for Diabetes and Regenerative Research of the Helmholtz Diabetes Center. Her group, together with Professor Axel Walch from the Core Facility Pathology & Tissue Analytics at Helmholtz Zentrum München, examined the adipose tissue and analyzed the sex differences in the browning of white adipose tissue.

There are still many gaps in our understanding of the biology underlying these sex-specific differences. As a long-term goal, the researchers therefore want to develop a biological network model that describes the differences between men and women (the ''sex-ome'') at system level. Such a model will require identifying  the primary and downstream sex-biased factors that act on the network and understanding how the sex-biased network interactions give rise to sex differences in the emergent phenotypes.

 

*Beiging (browning)
Brown adipose tissue can produce heat through the oxidation of fatty acids. This takes place in numerous mitochondria, which are also responsible for the brownish coloration of the tissue. If the "good" brown fat is activated, the metabolism is stimulated and the "bad" white fat deposits are reduced. The occurrence of brown or beige adipocytes in white adipose tissue is called browning or beiging, a phenomenon associated with increased energy consumption and, at least in the mouse model, with protection against obesity.

 

Original Publication:
Norheim et al., (2019): Gene-by-Sex Interactions in Mitochondrial Functions and Cardio-Metabolic Traits. Cell Metabolism, DOI: 10.1016/j.cmet.2018.12.013

Scientific Contact:
University Professor Susanna Hofmann, MD
Helmholtz Diabetes Center
Institute for Diabetes and Regeneration Research
Helmholtz Zentrum München
German Research Center for Environmental Health, GmbH
Ingolstädter Landstrasse 1
85764 Neuherberg
Germany
Phone: ++49-89-3187-2112
e-mail: susanna.hofmann(at)helmholtz-muenchen.de

 

As German Research Center for Environmental Health, Helmholtz Zentrum München pursues the goal of developing personalized medical approaches for the diagnosis, treatment and prevention of major common diseases such as diabetes, allergies and lung diseases. To achieve this, it investigates the interaction of genetics, environmental factors and lifestyle. The head office of the center is located in Neuherberg in the north of Munich. Helmholtz Zentrum München has about 2,300 staff members and is a member of the Helmholtz Association, a community of 19 scientific-technical and medical-biological research centers with a total of about 37,000 staff members. 

Press contact

Birgit Niesing


+49 (0)89 3187-3971

The development of cardio-metabolic traits such as obesity and insulin resistance may also depend on sex. Source: HMGU