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The genomic landscape of hypodiploid acute lymphoblastic leukemia.


ABSTRACT: The genetic basis of hypodiploid acute lymphoblastic leukemia (ALL), a subtype of ALL characterized by aneuploidy and poor outcome, is unknown. Genomic profiling of 124 hypodiploid ALL cases, including whole-genome and exome sequencing of 40 cases, identified two subtypes that differ in the severity of aneuploidy, transcriptional profiles and submicroscopic genetic alterations. Near-haploid ALL with 24-31 chromosomes harbor alterations targeting receptor tyrosine kinase signaling and Ras signaling (71%) and the lymphoid transcription factor gene IKZF3 (encoding AIOLOS; 13%). In contrast, low-hypodiploid ALL with 32-39 chromosomes are characterized by alterations in TP53 (91.2%) that are commonly present in nontumor cells, IKZF2 (encoding HELIOS; 53%) and RB1 (41%). Both near-haploid and low-hypodiploid leukemic cells show activation of Ras-signaling and phosphoinositide 3-kinase (PI3K)-signaling pathways and are sensitive to PI3K inhibitors, indicating that these drugs should be explored as a new therapeutic strategy for this aggressive form of leukemia.

SUBMITTER: Holmfeldt L 

PROVIDER: S-EPMC3919793 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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The genomic landscape of hypodiploid acute lymphoblastic leukemia.

Holmfeldt Linda L   Wei Lei L   Diaz-Flores Ernesto E   Walsh Michael M   Zhang Jinghui J   Ding Li L   Payne-Turner Debbie D   Churchman Michelle M   Andersson Anna A   Chen Shann-Ching SC   McCastlain Kelly K   Becksfort Jared J   Ma Jing J   Wu Gang G   Patel Samir N SN   Heatley Susan L SL   Phillips Letha A LA   Song Guangchun G   Easton John J   Parker Matthew M   Chen Xiang X   Rusch Michael M   Boggs Kristy K   Vadodaria Bhavin B   Hedlund Erin E   Drenberg Christina C   Baker Sharyn S   Pei Deqing D   Cheng Cheng C   Huether Robert R   Lu Charles C   Fulton Robert S RS   Fulton Lucinda L LL   Tabib Yashodhan Y   Dooling David J DJ   Ochoa Kerri K   Minden Mark M   Lewis Ian D ID   To L Bik LB   Marlton Paula P   Roberts Andrew W AW   Raca Gordana G   Stock Wendy W   Neale Geoffrey G   Drexler Hans G HG   Dickins Ross A RA   Ellison David W DW   Shurtleff Sheila A SA   Pui Ching-Hon CH   Ribeiro Raul C RC   Devidas Meenakshi M   Carroll Andrew J AJ   Heerema Nyla A NA   Wood Brent B   Borowitz Michael J MJ   Gastier-Foster Julie M JM   Raimondi Susana C SC   Mardis Elaine R ER   Wilson Richard K RK   Downing James R JR   Hunger Stephen P SP   Loh Mignon L ML   Mullighan Charles G CG  

Nature genetics 20130120 3


The genetic basis of hypodiploid acute lymphoblastic leukemia (ALL), a subtype of ALL characterized by aneuploidy and poor outcome, is unknown. Genomic profiling of 124 hypodiploid ALL cases, including whole-genome and exome sequencing of 40 cases, identified two subtypes that differ in the severity of aneuploidy, transcriptional profiles and submicroscopic genetic alterations. Near-haploid ALL with 24-31 chromosomes harbor alterations targeting receptor tyrosine kinase signaling and Ras signali  ...[more]

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