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Rearrangements of the RARA and PML genes in a cytogenetic variant of acute promyelocytic leukemia

Laurence Baranger, Martine Gardembas, Josette Hillion, C. Foussard, Norbert Ifrah, M Boasson, Roland Berger

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Abstract

Acute promyelocytic leukemia (APL) is usually associated with the translocation t(15;17)(q22;q12-21), which disrupts the retinoic acid receptor alpha (RARA) gene on chromosome 17 and the PML gene on chromosome 15. We report a patient with typical APL without the common t(15;17). Cytogenetic studies demonstrated a normal appearance of chromosomes 15, while a small marker seemed to be an i(17q-). Molecular analysis showed RARA and PML rearrangements, suggesting that the chromosome abnormality corresponded to a variant translocation.

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What this paper is about

Acute promyelocytic leukemia (APL) is usually associated with the translocation t(15;17)(q22;q12-21), which disrupts the retinoic acid receptor alpha (RARA) gene on chromosome 17 and the PML gene on chromosome 15. We report a patient with typical APL without the common t(15;17). Cytogenetic studies demonstrated a normal appearance of chromosomes 15, while a small marker seemed to be an i(17q-). Molecular analysis showed RARA and PML rearrangements, suggesting that the chromosome abnormality corresponded to a variant translocation.

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Available abstract

Acute promyelocytic leukemia (APL) is usually associated with the translocation t(15;17)(q22;q12-21), which disrupts the retinoic acid receptor alpha (RARA) gene on chromosome 17 and the PML gene on chromosome 15. We report a patient with typical APL without the common t(15;17). Cytogenetic studies demonstrated a normal appearance of chromosomes 15, while a small marker seemed to be an i(17q-). Molecular analysis showed RARA and PML rearrangements, suggesting that the chromosome abnormality corresponded to a variant translocation.

Key concepts: Chromosomal translocation, Acute promyelocytic leukemia, Promyelocytic leukemia protein, Biology, Chromosome 15, Gene, Chromosome 17 (human), Chromosome

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