Advances in Clinical and Experimental Medicine

Title abbreviation: Adv Clin Exp Med
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ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
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Advances in Clinical and Experimental Medicine

2020, vol. 29, nr 1, January, p. 107–113

doi: 10.17219/acem/112608

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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Analysis of the rRNA methylation complex components in pediatric B-cell precursor acute lymphoblastic leukemia: A pilot study

Marek Ussowicz1,B,C,D,E,F, Virginie Marcel2,B,D,E,F, Flora Nguyen Van Long2,B,C,E, Bernarda Kazanowska1,B,E,F, Jean-Jacques Diaz2,A,E,F, Dariusz Wołowiec3,A,E,F

1 Department of Pediatric Bone Marrow Transplantation, Oncology and Hematology, Wroclaw Medical University, Poland

2 The Université Claude Bernard Lyon 1, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, France

3 Department and Clinic of Hematology, Blood Neoplasms and Bone Marrow Transplantation, Wroclaw Medical University, Poland

Abstract

Background. Dysregulation of ribosome biogenesis and alteration of ribosome composition, including alteration in ribosomal RNA (rRNA) 2’-O-ribose methylation, can play a role in malignant transformation and cancer progression. Several studies recently reported that components of the rRNA methylation complex are associated with leukemogenesis. However, no study ever investigated the alteration of ribosome biogenesis factors in the most common pediatric malignancy – B-cell precursor acute lymphoblastic leukemia (BCP-ALL).
Objectives. The objective of this study was to examine the expression of factors building the rRNA methylation complex, either the protein components (1 methyl-transferase (FBL), NOP56, NOP58, NHP2L1) or some RNA components (box C/D snoRNAs: SNORD35B, SNORD65, SNORD46, SNORD50A, SNORD38B), as well as CMYC, and nucleolin (NCL) – a protein involved in rRNA synthesis. Clinical effects in children with BCP-ALL were also investigated.
Material and Methods. The factors involved in ribosome biogenesis were studied in 28 children with BCP-ALL with the use of real-time polymerase chain reaction (RT-PCR) using the BioMark HD System (Fluidigm, San Francisco, USA) in cDNA prepared from the bone marrow samples collected at diagnosis.
Results. Strong correlations were observed between NOP56, NOP58 and NCL, and multiple weaker correlations were observed in the box C/D snoRNA category, and between box C/D snoRNA and transcripts coding proteins of the rRNA methylation complex. The expression of analyzed transcripts did not correlate with the initial white blood cells count (WBC) or with bone marrow blast percentage. Ribosome biogenesis upregulation with overexpression of FBL and NOP56, and CMYC was found in patients who subsequently relapsed and the upregulation signature was not associated with known risk predictors.
Conclusion. This is the first report on the clinical aspect of ribosome biogenesis in pediatric BCP-ALL, and it shows that overexpression of CMYC and C/D box nucleoproteins FBL and NOP56 is an antecedent event in patients who subsequently relapse. The dysregulation pattern is different from the previous reports in acute myeloid leukemia (AML), suggesting that dysregulation of ribosome biogenesis is specific for BCP-ALL.

Key words

pediatric, methylation, relapse, acute lymphoblastic leukemia (ALL), ribosome

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