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BRIEF REPORT
From the Hematology and Bone Marrow
Transplantation Unit, University of Perugia; the International Cancer
Center, Laboratory of Molecular Biology, Rovigo; the Department of
Experimental and Diagnostic Medicine and Interdepartment Center for
Cancer Research, University of Ferrara, Italy; the Department of
Hematology, Sant Pau University Hospital, Barcelona; and the Department
of Hematology, Vall d'Hebron Hospital, Barcelona, Spain.
Fusion between the NUP98 and NSD3
genes in a patient with acute myeloid leukemia associated with
t(8;11)(p11.2;p15), is reported for the first time. The
t(8;11)(p11.2;p15) was identified by classical cytogenetics.
Fluorescence in situ hybridization (FISH) analysis revealed a split
signal with a mix of BAC 118H17 and 290A12, indicating the
translocation disrupted NUP98. FISH restriction at 8p11-12 showed a split of BAC 350N15. Molecular investigations into candidate genes in this BAC showed the NUP98 fusion partner at 8p11.2
was the NSD3 gene. To date the NSD3 gene has
never been implicated in hematologic malignancies.
(Blood. 2002;99:3857-3860) In myeloid malignancies several chromosomal
translocations and corresponding chimeric genes have been identified
between NUP98 at 11p15 and PMX1 at 1q23,
HOXD13 at 2q31, NSD1 at 5q35, HOXA9 at
7p15, LEDGF at 9p22, DDX10 at 11q22, and
TOP1 at 20q11.1-8 In lymphoid malignancies only
a subset of T-cell acute lymphoblastic leukemia with a t(4;11)(q21;p15)
and a NUP98-RAP1GDS1 fusion gene has been
reported to date.9
Chromosomal bands 8p11-p12 are involved in well-characterized
leukemic syndromes, such as acute myeloid leukemia (AML)
with erythrophagocytosis and t(8;16)(p11;p13.3)10
and a chronic myeloproliferative disorder (CMPD) with eosinophilia,
concomitant lymphoblastic leukemia-lymphoma, and
t(8;13)(p11;q12).11 As a result of translocations,
MOZ fuses with the CBP gene at 16p13.3 in AML,
and FGFR1 rearranges with ZNF198 at 13q12 in the
CMPD-lymphoma syndrome. Alternative recombinations with
TIF2/8q13 and p300/22q13 for MOZ gene
and with FOP/6q27 and CEP110/9q33 for
FGFR1 have also been described.12-16
We report the first patient with AML with recombination between
the NUP98 gene and a new partner at 8p11.2, telomeric to
FGFR1. NSD3 (nuclear receptor-binding su(var)3-9,
enhancer of zeste, trithorax [SET] domain containing gene 3), also
named WHSC1L1 (Wolf-Hirschhorn syndrome
candidate-1-like-1), belongs to the same family as
NSD1, whose mouse homolog is an RAR Patient history
Cytogenetics and fluorescence in situ hybridization
The 8p11-12 breakpoint was investigated using YAC 176C9 (Dr M. Chaffanet, Marseilles, France) spanning the MOZ gene, BAC 350N15 spanning the FGFR1 gene, and BAC 513D5 telomeric to the FGFR1 locus. Probes were biotin-labeled. A centromeric probe labeled with digoxigenin was added in each experiment for chromosome 8 (D8Z1) or for chromosome 11 (D11Z1) (Oncor, Gaithersburg, MD). At least 8 metaphases were analyzed using an Olympus fluorescence microscope equipped with a cooled CCD camera (Sensys, Photometrics, Tucson, AZ) run by Pathvysion (Vysis, Stuttgart, Germany). Molecular characterization Database searches and sequence analyses were performed using BLAST algorithms (http://www.ncbi.nlm.nih.gov/BLAST) and RepeatMasker (http://repeatmasker.genome.washington.edu/cgi-bin/RepeatMasker). All NUP98 primers have been described previously19 except NUP737F, AGTCACTAGAGGAACTTCG. NSD3 primers were designed on GenBank accession number AK022560 (FLJ536f, CAGAAATTCCAAACACAAGAC; FLJ940f, CCAGTTCAGCCAATACTATC; FLJ1856Af, AGCCAACGCAGAGTGTATCATC; FLJ2907Br, GGTGGGCCTCGTTAGACTGCTC; FLJ3081Cr, TTCCCCCAAAATTTCCATACAA; FLJ1204Df, GAAGAATTACTGGCTGAGGCAAC; FLJ1747Er, ATTTCCCATCCCCTGTAGCATTC) and GenBank accession number AF332469 (W1L2863R1, AATTTGCGGACACAGGCTTC; W1L2685R2, TGCAGCACTCTCCCTCAC).Total RNA was reverse-transcribed using SuperscriptII (Life Technologies, Gaithersburg, MD). Using the Expand Long Template PCR System (Roche, Mannheim, Germany) and the appropriate primers, cDNA aliquots were amplified in 10-µL polymerase chain reaction (PCR) as follows: 35 amplification cycles at 94°C for 5 minutes 10 seconds (94°C for 50 seconds, 58°C for 20 seconds, and 68°C for 4 minutes) and at 68°C for 5 minutes. Nested PCR was carried out as follows: 35 amplification cycles at 94°C for 5 minutes (94°C for 30 seconds, 58°C for 20 seconds, 68°C for 2 minutes) and at 68°C for 5 minutes. Sequencing was performed with an automated ABI377 sequencing station after purification using Concert Rapid PCR Purification System (Life Technologies).
The t(8;11)(p11.2;p15) translocation was found as
an isolated anomaly in all 20 bone marrow karyotypes from this patient
with de novo AML. The mixture of BAC 118H17 and 290A12 was split, thus generating 3 spots of fluorescence: on normal chromosome 11, on der(11), and on der(8) (Figure 1A, left
panel). BAC 350N15 spanned the 8p11-12 breakpoint, showing
hybridization signals on normal chromosome 8, on der(8), and on der(11)
(Figure 1A, right panel).
BAC 350N15 was found to contain 2 candidate genes, FGFR1 and NSD3, which were screened for an in-frame fusion transcript with NUP98. PCR experiments excluded FGFR1 involvement. The NSD3 gene, like NSD2, is known to encode 2 splicing isoforms, a long form and a short form.20,21 Primers were first designed on the short form (FLJ1856Af, FLJ2907Br, FLJ3081Cr, FLJ1204Df, FLJ1747Er). As reports suggest, the 5' end of NUP98 bears the oncogenic-related portion. PCR experiments investigated whether (5')NUP98-NSD3(3') chimeric transcripts were present in patient-derived cDNA. Results showed NUP98-NSD3 fusion transcripts (Figure 1B,
upper panel). The NUP1252F-FLJ1747Er amplification product was
sequenced, confirming an in-frame fusion between the 2 genes (Figure
1B, lower panel). Breakpoints were located between exons 3 and 4 in the
NSD3 gene and between exons 11 and 12 in NUP98
(Figure 2A-B). Successful amplification
from primer FLJ3081Cr implied the expression of short-form chimeric
NSD3 (Figure 2C).
To investigate the expression of long-form mRNA (Figure 2D), nested PCR was performed with primers W1L2685R2 and W1L2863R1 in combination with NUP98 forward primers. Only one band, of the appropriate length, was amplified (data not shown), confirming that the long transcript was present. Because no product was extended after exon 12, the presence of exon 14, which is involved in alternative splicing20 (Figure 2A,E), could not be determined. We also analyzed the expression of the reciprocal transcript (5')NSD3-NUP98(3') by matching primers NUP1811R and NUP2887R with 2 NSD3 forward primers FLJ536f and FLJ940f. A specific band of the correct length (data not shown) revealed the patient's cells expressed reciprocal fusion mRNA. The reciprocal transcript NSD3-NUP98 maintained the 5' part of NSD3, encoding for a split PWWP domain, and the 3' part of NUP98, with few FG repeats and the RNA-binding domain (Figure 2F). As far as we know, NSD3 is the eighth NUP98 partner in myeloid malignancies, so NUP98, like MLL and ETV6, is emerging as a promiscuous gene that recombines and fuses with different genomic sites. In the NSD family, NSD1, located at 5q35, has been shown to rearrange with NUP98 in childhood AML.3 NSD2, located at 4p16, is the fusion partner of immunoglobulin heavy- chain gene at 14q32 in a recurrent translocation of multiple myeloma.21,22 Angrand et al20 found NSD3 as part of an amplicon in breast cancer with 8p karyotypic abnormalities. We also confirmed NSD3 amplification in 1 of 30 unselected cases of breast cancer analyzed by semiquantitative PCR (unpublished data, May 2001). This is the first report of NSD3 rearrangements in hematologic malignancies. These 3 NSD family members have a common region of conserved
architecture3,20,21 In conclusion, NSD3 has been observed for the first time as a translocation partner of NUP98 in acute myeloid leukemia. Further functional analysis of the chimeric transcripts will elucidate their specific role in leukemogenesis.
Submitted October 5, 2001; accepted January 14, 2002.
Supported by Associazione Italiana per la Ricerca sul Cancro (C.M., M.N.), Associazione Italiana contro le Leucemie-linfomi (C.M.), Ministero dell'Università e della Ricerca Scientifica e Tecnologica (C.M., M.N.), and Associazione Sergio Luciani (R.R.).
R.R. and R.L.S. contributed equally to this work.
The publication costs of this article were defrayed in part by page charge payment. Therefore, and solely to indicate this fact, this article is hereby marked "advertisement" in accordance with 18 U.S.C. section 1734.
Reprints: Cristina Mecucci, Hematology and Bone Marrow Transplantation Unit, Policlinico Monteluce, Via Brunamonti, 06123 Perugia, Italy; e-mail: crimecux{at}unipg.it.
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© 2002 by The American Society of Hematology.
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