TFE3 activation in a TSC1-altered malignant PEComa: challenging the dichotomy of the underlying pathogenic mechanisms
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TFE3 activation in a TSC1-altered malignant PEComa: challenging the dichotomy of the underlying pathogenic mechanisms. / Schmiester, Maren; Dolnik, Anna; Kornak, Uwe; Pfitzner, Berit; Hummel, Michael; Treue, Denise; Hartmann, Arndt; Agaimy, Abbas; Weyerer, Veronika; Lekaj, Anja; Brakemeier, Susanne; Peters, Robert; Öllinger, Robert; Märdian, Sven; Bullinger, Lars; Striefler, Jana Käthe; Flörcken, Anne.
in: J PATHOL CLIN RES, Jahrgang 7, Nr. 1, 01.2021, S. 3-9.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - TFE3 activation in a TSC1-altered malignant PEComa: challenging the dichotomy of the underlying pathogenic mechanisms
AU - Schmiester, Maren
AU - Dolnik, Anna
AU - Kornak, Uwe
AU - Pfitzner, Berit
AU - Hummel, Michael
AU - Treue, Denise
AU - Hartmann, Arndt
AU - Agaimy, Abbas
AU - Weyerer, Veronika
AU - Lekaj, Anja
AU - Brakemeier, Susanne
AU - Peters, Robert
AU - Öllinger, Robert
AU - Märdian, Sven
AU - Bullinger, Lars
AU - Striefler, Jana Käthe
AU - Flörcken, Anne
N1 - © 2020 The Authors. The Journal of Pathology: Clinical Research published by The Pathological Society of Great Britain and Ireland & John Wiley & Sons, Ltd.
PY - 2021/1
Y1 - 2021/1
N2 - Perivascular epithelioid cell tumors (PEComas) form a family of rare mesenchymal neoplasms that typically display myomelanocytic differentiation. Upregulation of mTOR signaling due the inactivation of TSC1/2 (Tuberous Sclerosis 1 and 2) is believed to be a key oncogenic driver in this disease. Recently, a subgroup of PEComas harboring TFE3 (Transcription Factor E3) rearrangements and presenting with a distinctive morphology has been identified. TSC1/2 and TFE3 aberrations are deemed to be mutually exclusive in PEComa, with two different pathogenic mechanisms assumed to lead to tumorigenesis. Here, we challenge this dichotomy by presenting a case of a clinically aggressive TCS1-mutated PEComa displaying a TFE3-altered phenotype. FISH analysis was suggestive of a TFE3 inversion; however, RNA and whole genome sequencing was ultimately unable to identify a fusion involving the gene. However, a copy number increase of the chromosomal region encompassing TFE3 was detected and transcriptome analysis confirmed upregulation of TFE3, which was also seen at the protein level. Therefore, we believe that the TSC1/2-mTOR pathway and TFE3 overexpression can simultaneously contribute to tumorigenesis in PEComa. Our comprehensive genetic analyses add to the understanding of the complex pathogenic mechanisms underlying PEComa and harbor insights for clinical treatment options.
AB - Perivascular epithelioid cell tumors (PEComas) form a family of rare mesenchymal neoplasms that typically display myomelanocytic differentiation. Upregulation of mTOR signaling due the inactivation of TSC1/2 (Tuberous Sclerosis 1 and 2) is believed to be a key oncogenic driver in this disease. Recently, a subgroup of PEComas harboring TFE3 (Transcription Factor E3) rearrangements and presenting with a distinctive morphology has been identified. TSC1/2 and TFE3 aberrations are deemed to be mutually exclusive in PEComa, with two different pathogenic mechanisms assumed to lead to tumorigenesis. Here, we challenge this dichotomy by presenting a case of a clinically aggressive TCS1-mutated PEComa displaying a TFE3-altered phenotype. FISH analysis was suggestive of a TFE3 inversion; however, RNA and whole genome sequencing was ultimately unable to identify a fusion involving the gene. However, a copy number increase of the chromosomal region encompassing TFE3 was detected and transcriptome analysis confirmed upregulation of TFE3, which was also seen at the protein level. Therefore, we believe that the TSC1/2-mTOR pathway and TFE3 overexpression can simultaneously contribute to tumorigenesis in PEComa. Our comprehensive genetic analyses add to the understanding of the complex pathogenic mechanisms underlying PEComa and harbor insights for clinical treatment options.
KW - Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/genetics
KW - Biomarkers, Tumor/genetics
KW - DNA Copy Number Variations
KW - Disease Progression
KW - Fatal Outcome
KW - Female
KW - Gene Amplification
KW - Gene Expression Profiling
KW - Genetic Predisposition to Disease
KW - Humans
KW - In Situ Hybridization, Fluorescence
KW - Kidney Neoplasms/genetics
KW - Middle Aged
KW - Mutation
KW - Perivascular Epithelioid Cell Neoplasms/genetics
KW - Phenotype
KW - Transcriptional Activation
KW - Treatment Outcome
KW - Tuberous Sclerosis Complex 1 Protein/genetics
KW - Whole Genome Sequencing
U2 - 10.1002/cjp2.187
DO - 10.1002/cjp2.187
M3 - SCORING: Journal article
C2 - 33180365
VL - 7
SP - 3
EP - 9
JO - J PATHOL CLIN RES
JF - J PATHOL CLIN RES
SN - 2056-4538
IS - 1
ER -