A hypomorphic PALB2 allele gives rise to an unusual form of FA-N associated with lymphoid tumour development

McKinnon, Peter, Byrd, Philip J, Stewart, Grant. S, Smith, Anna, Eaton, Charlotte, Taylor, Alexander J, Guy, Chloe, Eringyte, Ieva, Fooks, Peggy, Last, James I, Horsley, Robert, Oliver, Antony W, Janic, Dragana, Dokmanovic, Lidija, Stankovic, Tatjana and Taylor, A Malcolm R (2016) A hypomorphic PALB2 allele gives rise to an unusual form of FA-N associated with lymphoid tumour development. PLOS Genetics, 12 (3). e1005945. ISSN 1553-7404

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Abstract

Patients with biallelic truncating mutations in PALB2 have a severe form of Fanconi anaemia (FA-N), with a predisposition for developing embryonal-type tumours in infancy. Here we describe two unusual patients from a single family, carrying biallelic PALB2 mutations, one truncating, c.1676_1677delAAinsG;(p.Gln559ArgfsTer2), and the second, c.2586+1G>A; p.Thr839_Lys862del resulting in an in frame skip of exon 6 (24 amino acids). Strikingly, the affected individuals did not exhibit the severe developmental defects typical of FA-N patients and initially presented with B cell non-Hodgkin lymphoma. The expressed p.Thr839_Lys862del mutant PALB2 protein retained the ability to interact with BRCA2, previously unreported in FA-N patients. There was also a large increased chromosomal radiosensitivity following irradiation in G2 and increased sensitivity to mitomycin C. Although patient cells were unable to form Rad51 foci following exposure to either DNA damaging agent, U2OS cells, in which the mutant PALB2 with in frame skip of exon 6 was induced, did show recruitment of Rad51 to foci following damage. We conclude that a very mild form of FA-N exists arising from a hypomorphic PALB2 allele.

Item Type: Article
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
Subjects: Q Science > Q Science (General)
Depositing User: Antony Oliver
Date Deposited: 21 Mar 2016 11:02
Last Modified: 07 Mar 2017 07:46
URI: http://sro.sussex.ac.uk/id/eprint/60113

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