The MLL-AF9 oncogene originates from the translocation t(9;11)(p22;q23), which is mainly associated with monocytic acute myeloid leukaemia (AML-M5; FABclassification). In AML-M5 THP-1 cells carrying t(9;11) (p22;q23) and expressing MLL-AF9, we previously showed that MLL-AF9 expression is down-regulated during monocytemacrophage maturation. We have subsequently observed that in a ‘rapid-growing’...

The chromosomal translocation, t (4 ; l l )(q21 ;q23), is the most common type of 1 1 q23 chromosomal abnormality, being highly prevalent in infant acute leukemias and associated with a poor prognosis. The t (4 ; l l ) results in the fusion of an ll q23 gene (MLL, HRX, Htrx-1 , or ALL-1) and a 4q21 gene (AF-4 or FEL). To further evaluate the 4q21 gene and its role in t(4;ll) acute leukemia, we ...

The current report presents a case of de novo acute myeloid leukemia (AML) in a 32-year-old male. Cytogenetic analysis showed that the karyotype of the bone marrow cells was as follows: 46,XY,t(11;22)(q23;q11.2)[13]/46,X,-Y,+10,t(11;22)(q23;q11.2)[7]/47,XY,+10,t(11;22)(q23;q11.2)[1]/46,XY[1]. Fluorescence in situ hybridization analysis using a mixed lineage leukemia (MLL)-specific probe showed ...

We describe a familial pattern of gonosomal-autosomal translocation between the X and 18 chromosomes, balanced and unbalanced forms, in male and female siblings. The proposita was consulted for hypergonadotropic hypogonadism. Karyotype analysis revealed a balanced 46, X, t(X;18)(q22.3;q23) genotype. The sister of the proband presented with oligomenorrhea with irregular menses and possesses an u...

Therapy-related ALL (t-ALL) is a rare secondary leukemia that develops after chemotherapy and/or radiotherapy for primary malignancies. Chromosomal 11q23 abnormalities are the most common karyotypic alterations in t-ALL. The t(11;19)(q23;p13) aberration is extremely rare and has not been confirmed at the molecular genetic level. Here, we report a case of t-ALL with t(11;19)(q23;p13.3) and MLL-M...

A 23-year-old male presented with pulmonary tuberculosis and swelling of both lower limbs. He was put on antitubercular treatment. Hemogram showed mild anemia and Pseudo Pelger-huet cells. The bone marrow (BM) examination showed 52% promyelocytes with regular round to oval nuclei, few granules and were positive for CD13 and CD33, and negative for HLA-DR. Cytogenetic analysis of the BM aspirate ...

One of the most common chromosomal breakpoint regions in acute myeloid leukaemia is the chromosome band 11q23. The analysis of this region led to the discovery of the extremely promiscuous MLL gene, in which more than 60 MLL translocation partner genes have been described. Among the most frequent are t(9;11)(p21-22;q23)/MLL-AF9, t(10; 11)(p13; q23)/MLL-AF10, t(11;19)(q23;p13)/MLL-ELL, ENL and t...