Open AccessA mutation affecting laminin alpha 5 polymerisation gives rise to a syndromic developmental disorder
Author(s) -
Lynelle K. Jones,
Rachel Lam,
Karen K. McKee,
Maya Aleksandrova,
John Dowling,
Stephen I. Alexander,
Amali Mallawaarachchi,
Denny L. Cottle,
Kieran M. Short,
Lynn Pais,
Jeffery H. Miner,
Andrew Mallett,
Cas Simons,
Hugh McCarthy,
Peter D. Yurchenco,
Ian Smyth
Publication year - 2020
Publication title -
development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.754
H-Index - 325
eISSN - 1477-9129
pISSN - 0950-1991
DOI - 10.1242/dev.189183
Subject(s) - biology , laminin , basement membrane , neural tube , phenotype , mutation , microbiology and biotechnology , limb development , craniofacial , genetics , gene , extracellular matrix , embryo
Laminin alpha 5 (LAMA5) is a member of a large family of proteins which trimerize 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, 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 polymerization 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 α/β/γ laminin trimers. Comparing these in vivo phenotypes with those apparent upon gene deletion provides insights into the specific functional importance of laminin polymerization during development and tissue homeostasis.