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Mutation in PIGA Results in a CD52-Negative Escape Variant in a Sézary Syndrome Patient during Alemtuzumab Treatment  Constantijn J.M. Halkes, Willem.

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Presentation on theme: "Mutation in PIGA Results in a CD52-Negative Escape Variant in a Sézary Syndrome Patient during Alemtuzumab Treatment  Constantijn J.M. Halkes, Willem."— Presentation transcript:

1 Mutation in PIGA Results in a CD52-Negative Escape Variant in a Sézary Syndrome Patient during Alemtuzumab Treatment  Constantijn J.M. Halkes, Willem H. Zoutman, Leslie van der Fits, Inge Jedema, Maarten H. Vermeer  Journal of Investigative Dermatology  Volume 135, Issue 4, Pages (April 2015) DOI: /jid Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

2 Figure 1 Effect of alanine aminotransferase (ALT) treatment on CD52+ Sézary syndrome (SS) cells and ultimate formation of disease relapse caused by CD52-, glycosylphosphatidyl-inositol (GPI) anchor defective SS cells escaping from ALT treatment. The patient was treated with 10 mg ALT subcutaneously (s.c.) for his CD52+ SS at different time points (Δ, first infusion was 3 mg s.c. (Δ)). On the primary y-axis we plotted the absolute numbers of CD52+ SS cells in peripheral blood at different days after first ALT treatment (black line). After initial disease control the patient relapsed. This disease relapse was no longer responding to ALT treatment because of the absence of CD52 expression on the recurring SS cells, caused by loss of GPI anchor expression as determined by staining with Alexa Fluor 488–labeled fluorescent aerolysin (FLAER). On the secondary y-axis we plotted the absolute number of CD52-/FLAER- SS cells at different days after first ALT treatment (gray line). On day 280 after the first ALT treatment cyclophosphamide, hydroxydaunorubicin, oncovin, prednisone treatment was started ( × ). Journal of Investigative Dermatology  , DOI: ( /jid ) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

3 Figure 2 Results of sequencing and transcription analysis of PIGA in CD52+ and CD52- flow cytometry–sorted tumor cells. (a) Sanger sequencing results of genomic DNA originated from CD52+ (left) and CD52– tumor cells (right). Sequences represent the splice site region between the 3′ end of exon 2 and 5′ start of intron 2 of PIGA (HGNC: 8957). Boxed nucleotides represent the most relevant bases of the 5′ intron splice site consensus. CD52– tumor cells contain a homozygous mutation in this site (IVS2+2T>G). (b) Schematic depiction of the PIGA gene as located on chromosome X. Arrows indicate direction of transcription where small boxes represent non-coding exonic sequences and large boxes represent coding regions. Observed PIGA transcripts in CD52+ tumor cells (left) include the coding variant 1 (NM: ), whereas CD52- tumor cells (right), containing the IVS2+2T>G splice site mutation, consist only of non-coding variants. Journal of Investigative Dermatology  , DOI: ( /jid ) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

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