Document Detail

Chromosomal translocation t(8;12) induces aberrant HMGIC expression in aggressive angiomyxoma of the vulva.
MedLine Citation:
PMID:  11550285     Owner:  NLM     Status:  MEDLINE    
Benign mesenchymal neoplasms associated with rearrangements of the DNA architectural factor gene HMGIC on chromosome 12 include lipomas, uterine leiomyomata, pulmonary chondroid hamartomas, endometrial polyps, salivary gland pleomorphic adenomas, and breast fibroadenomas. Although HMGIC also has been implicated in the pathobiology of aggressive angiomyxoma of the vulva, the molecular mechanisms pertaining to this neoplasm are unclear. Tissue from a recurrent aggressive angiomyxoma was investigated by cytogenetic and expression analysis for HMGIC and HMGIY. The trypsin-Giemsa-banded karyotype showed a clonal translocation between chromosomes 8 and 12 [46,XX,t(8;12)(p12;q15)]. Fluorescence in situ hybridization (FISH) analysis with whole chromosome paint probes for chromosomes 8 and 12 excluded cryptic involvement of other chromosomes. The chromosome 12 breakpoint was mapped with two-color FISH analysis using cosmid probes at the 5' and 3' termini of HMGIC. Both cosmid probes showed hybridization to the normal chromosome 12 and the der(12) chromosome, indicating that the breakpoint was 3' (telomeric) to the gene. Reverse transcriptase-polymerase chain reaction (RT-PCR) analysis revealed HMGIC expression in the tumor, and immunohistochemistry localized HMGIC expression to the tumor's spindle cells. Like numerous benign mesenchymal tumors, this locally aggressive tumor is associated with rearrangements near or within HMGIC, but chimeric gene formation was not required for tumorigenesis. Inappropriate expression of this DNA binding protein, however, may be important in the pathobiology of this tumor. Understanding the pathogenetic mechanism may also be helpful in developing new diagnostic tools for identifying residual disease.
M R Nucci; S Weremowicz; D M Neskey; K Sornberger; G Tallini; C C Morton; B J Quade
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Genes, chromosomes & cancer     Volume:  32     ISSN:  1045-2257     ISO Abbreviation:  Genes Chromosomes Cancer     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-09-10     Completed Date:  2001-12-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9007329     Medline TA:  Genes Chromosomes Cancer     Country:  United States    
Other Details:
Languages:  eng     Pagination:  172-6     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Wiley-Liss, Inc.
Division of Women's and Perinatal Pathology, Brigham and Women's Hospital and Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
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MeSH Terms
Chromosomes, Human, Pair 12 / genetics*
Chromosomes, Human, Pair 8 / genetics*
Gene Expression Regulation, Neoplastic / genetics*
HMGA2 Protein / genetics*
Myxoma / genetics*,  pathology
Neoplasm Proteins / genetics*
Translocation, Genetic / genetics*
Vulvar Neoplasms / genetics*,  pathology
Grant Support
Reg. No./Substance:
0/HMGA2 Protein; 0/Neoplasm Proteins

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