News

Zooming in on muscular dystrophy: dissecting the mechanisms leading to disease

Encontro Scientia with Vanessa Ribeiro (Development and Evolutionary Morphogenesis)

17 November 2022 . 12h00
Room 2.2.21, Faculty of Sciences of the University of Lisbon

The extracellular matrix (ECM) is an acellular network of proteins and other molecules that surround, support and give structure to cells and tissues. The ECM contributes to cell-cell communication and plays an important role in fundamental cellular mechanisms as proliferation, differentiation, migration and also in repairing damaged tissue. Laminins are glycoproteins that assemble into a primary scaffold that attaches the ECM to the cell surface. Modifying the structure of these proteins will lead to ECM destabilization, which in turn will affect the basic cellular mechanisms, and consequently lead to disease.

One such example are mutations in LAMA2, which encodes laminin-a2 chain, present in the major laminin isoforms of skeletal muscles. These mutations trigger LAMA2-congenital muscular dystrophy (LAMA2-CMD), the most common congenital muscular dystrophy. This often-lethal autosomal recessive disease is characterized by muscle weakness (hypotonia) and atrophy detectable at orsoon after birth. Our previous studies defined the time and identified some key features of the onset of LAMA2-CMD, using a mouse model for the disease (dyW). The disease onset coincides with a dramatic drop in muscle stem cells (MuSCs)/myoblasts and an overactivation of Jak-Stat signaling in fetal skeletal muscles. With the aim of understanding which signaling pathways are perturbing the normal development of MuSCs/myoblasts, and how these events trigger the onset of the disease, we investigated how Lama2-deficiency affects MuSC/myoblast differentiation. These findings contribute to increasing our understanding of the molecular and cellular mechanisms underlying the first steps of LAMA2-CMD, essential for the development of targeted therapies for this incurable disease.

Join us IN PERSON (FCUL Room 2.2.21) or, if you are located in Azores or at MUHNAC, by Zoom (https://videoconf-colibri.zoom.us/j/95246381069?pwd=UEs3S1JiZFBneVp3M3ZrZ3F6RitVUT09; Password: 808103)


Tags: DEM encontro scientia development developmental biology morphogenesis congenital muscular dystrophy

Other Articles

  • Impact of small-scale farming landscapes on neutral and adaptive genetic variability of Iberian  wild bees

    Conference Impact of small-scale farming landscapes on neutral and adaptive genetic variability of Iberian wild bees

  • E3 Talk | Estación Biológica Manu: Donde los Andes se encuentra con la Amazonia

    Conference E3 Talk | Estación Biológica Manu: Donde los Andes se encuentra con la Amazonia

  • Modeling the transmission risk of Mycobacterium avium subsp. paratuberculosis across the mammal community of a Mediterranean agro-forestry farmstead

    Conference Modeling the transmission risk of Mycobacterium avium subsp. paratuberculosis across the mammal community of a Mediterranean agro-forestry farmstead

  • The evolution of plasticity during anthropogenic change: Cue-environment mismatches in Lepidoptera

    Conference The evolution of plasticity during anthropogenic change: cue-environment mismatches in Lepidoptera

  • A new approach to Encontros Scientia: facilitate understanding to increase uptake

    Conference A new approach to Encontros Scientia: facilitate understanding to increase uptake