The structural maintenance of chromosomes (SMC) family of proteins supports mitotic proliferation, meiosis, and DNA repair to control genomic stability. Impairments in chromosome maintenance are linked to rare chromosome breakage disorders. Here, we have identified a chromosome breakage syndrome associated with severe lung disease in early childhood. Four children from two unrelated kindreds died of severe pulmonary disease during infancy following viral pneumonia with evidence of combined T and B cell immunodeficiency. Whole exome sequencing revealed biallelic missense mutations in the
Saskia N. van der Crabben, Marije P. Hennus, Grant A. McGregor, Deborah I. Ritter, Sandesh C.S. Nagamani, Owen S. Wells, Magdalena Harakalova, Ivan K. Chinn, Aaron Alt, Lucie Vondrova, Ron Hochstenbach, Joris M. van Montfrans, Suzanne W. Terheggen-Lagro, Stef van Lieshout, Markus J. van Roosmalen, Ivo Renkens, Karen Duran, Isaac J. Nijman, Wigard P. Kloosterman, Eric Hennekam, Jordan S. Orange, Peter M. van Hasselt, David A. Wheeler, Jan J. Palecek, Alan R. Lehmann, Antony W. Oliver, Laurence H. Pearl, Sharon E. Plon, Johanne M. Murray, Gijs van Haaften
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