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A mutation affecting laminin alpha 5 polymerisation gives rise to a syndromic developmental disorder


Laminin alpha 5 (LAMA5) is a member of a large family of proteins that trimerise and then polymerise to form a central component of all basement membranes. Consequently, the protein plays an instrumental role in shaping the normal development of the kidney, skin, neural tube, lung and limb, and many other organs and tissues. Pathogenic mutations in some laminins have been shown to cause a range of largely syndromic conditions affecting the competency of the basement membranes to which they contribute. We report the identification of a mutation in the polymerisation domain of LAMA5 in a patient with a complex syndromic disease characterised by defects in kidney, craniofacial and limb development, and by a range of other congenital defects. Using CRISPR-generated mouse models and biochemical assays, we demonstrate the pathogenicity of this variant, showing that the change results in a failure of the polymerisation of alpha/beta/gamma laminin trimers. Comparing these in vivo phenotypes with those apparent upon gene deletion in mice provides insights into the specific functional importance of laminin polymerisation during development and tissue homeostasis.

Type Journal
ISBN 1477-9129 (Electronic) 0950-1991 (Linking)
Authors Jones, L. K.; Lam, R.; McKee, K. K.; Aleksandrova, M.; Dowling, J.; Alexander, S. I.; Mallawaarachchi, A.; Cottle, D. L.; Short, K. M.; Pais, L.; Miner, J. H.; Mallett, A. J.; Simons, C.; McCarthy, H.; Yurchenco, P. D.; Smyth, I. M.
Responsible Garvan Author Dr Amali Mallawaarachchi
Publisher Name DEVELOPMENT
Published Date 2020-06-30
Published Volume 147
Published Issue 21
Status Published in-print
DOI 10.1242/dev.189183
URL link to publisher's version