Germline Genetic IKZF1 Variation and Predisposition to Childhood Acute Lymphoblastic Leukemia

Publication date: Available online 19 April 2018
Source:Cancer Cell
Author(s): Michelle L. Churchman, Maoxiang Qian, Geertruy te Kronnie, Ranran Zhang, Wenjian Yang, Hui Zhang, Tobia Lana, Paige Tedrick, Rebekah Baskin, Katherine Verbist, Jennifer L. Peters, Meenakshi Devidas, Eric Larsen, Ian M. Moore, Zhaohui Gu, Chunxu Qu, Hiroki Yoshihara, Shaina N. Porter, Shondra M. Pruett-Miller, Gang Wu, Elizabeth Raetz, Paul L. Martin, W. Paul Bowman, Naomi Winick, Elaine Mardis, Robert Fulton, Martin Stanulla, William E. Evans, Mary V. Relling, Ching-Hon Pui, Stephen P. Hunger, Mignon L. Loh, Rupert Handgretinger, Kim E. Nichols, Jun J. Yang, Charles G. Mullighan
Somatic genetic alterations of IKZF1, which encodes the lymphoid transcription factor IKAROS, are common in high-risk B-progenitor acute lymphoblastic leukemia (ALL) and are associated with poor prognosis. Such alterations result in the acquisition of stem cell-like features, overexpression of adhesion molecules causing aberrant cell-cell and cell-stroma interaction, and decreased sensitivity to tyrosine kinase inhibitors. Here we report coding germline IKZF1 variation in familial childhood ALL and 0.9% of presumed sporadic B-ALL, identifying 28 unique variants in 45 children. The majority of variants adversely affected IKZF1 function and drug responsiveness of leukemic cells. These results identify IKZF1 as a leukemia predisposition gene, and emphasize the importance of germline genetic variation in the development of both familial and sporadic ALL.

Graphical abstract

Teaser

Churchman et al. identify 28 unique germline IKZF1 coding variants in 45 children with acute lymphoblastic leukemia. Many of these variants are not predicted to be damaging using in silico prediction tools, but functional tests reveal that the majority of them have deleterious effects on IKAROS function.


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