Cytogenetic/translocations Flashcards
BCR gene
chromosome 22
ABL gene
chromosome 9
BCR-ABL fusion gene
Chronic Myelogenous Leukemia (CML)
activating point mutations
in JAK/2 TYROSINE
KINASE
P. vera
Essential thrombocytosis
Primary
myelofibrosis
Polycythemia vera Cytogenetic
activating point mutations
in JAK/2 TYROSINE
KINASE
MPL mutation–> thrombopoietin activated
protein kinase
Essential
thrombocytosis;
Primary
myelofibrosis
Calreticulin mutation
Essential thrombocytosis;
functions
in the
endoplasmic reticulum
Calreticulin mutation
Inappropriate release of
fibrogenic factors from
neoplastic megakaryocytes
PDGF and TGF-beta
Primary
myelofibrosis
BCR-ABL fusion protein induces signaling via
RAS and JACK/STAT pathways
CML
Negative Leukocyte alkaline phosphatase (LAP)
CML
Positive LAP
leukemoid rxn
can transfrom to AML or ALL
CML
loss of function mutations in Pax5,
TEL/AML translocation
and E2A
B cell ALL
NOTCH gain of function
mutation
T cell ALL
B-cell have Ig light chain and CD19, 20, 22, 103 and annexin but NOT CD21
Hairy Cell Leukemia
express CD45 and Tartrate resistant acid phosphatase (TRAP).
Hairy Cell Leukemia
t(15,17)
Acute promyelocytic
leukemia (M3)
PML/RARalpha in-frame fusion of gene coding sequences which results in a functional unregulated retinoic acid receptor
Acute promyelocytic
leukemia (M3)
Activating point mutations in serine/threonine kinase BRAF downstream from RAS in the MAPK cascade.
Hairy Cell Leukemia
up regulation of the antiapoptotic
protein BCL-2
CLL/
SLL
trisomy
12 or deletions of 11, 13, or
17.
CLL/
SLL
Bcl-2
Normally antiapoptotic; when UPREGULATED, then no apoptosis–> cancer
CD19, CD20 and coexpress CD5 (T-cell marker)
CLL/SLL;
Mantle cell
lymphoma
slow, indolent
course; can
transform to DLBCL
(Richter’s syndrome
CLL/SLL;
Absolute lymphocytosis on peripheral blood smear:
•
W/ small lymphocytes, smudge cells, AIHA (spherocytes)
CLL/SLL;
large, rapidly expanding abdominal mass—higher grade type lymphoma)
CLL Transformation to DLBCL or Richters Syndrome
overexpression of cycle D1 that promotes G1 to S-phase progression.
Mantle Cell Lymphoma
Cyclin D1 chromosome
11