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Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
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Anatomic position determines oncogenic specificity in melanoma.

Joshua M Weiss1,2,3, Miranda V Hunter2, Nelly M Cruz2

  • 1Weill Cornell/Rockefeller/Sloan Kettering Tri-Institutional MD-PhD Program, New York, NY, USA.

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Summary
This summary is machine-generated.

Cellular location dictates cancer susceptibility. Specific gene programs in acral melanoma, driven by CRKL amplification and HOX13 genes, promote tumor growth at extremities.

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Area of Science:

  • Oncology
  • Genetics
  • Developmental Biology

Background:

  • Oncogenic mutations do not always lead to cancer, suggesting context-dependent cellular responses.
  • The specific anatomic location of a cell may influence its susceptibility to oncogenes.
  • Melanoma subtypes, cutaneous and acral, exhibit distinct origins and genetic profiles.

Purpose of the Study:

  • To investigate the role of anatomic position in determining cellular response to oncogenic alterations.
  • To identify genetic differences between cutaneous and acral melanomas.
  • To elucidate the mechanisms underlying the specific susceptibility of acral melanocytes to certain oncogenes.

Main Methods:

  • DNA sequencing of human cutaneous and acral melanoma samples.
  • Development of transgenic zebrafish models to study oncogene-driven tumor formation.
  • RNA profiling of melanocytes from different anatomic locations in zebrafish.
  • Functional studies to abrogate CRKL-driven programs.

Main Results:

  • Enrichment of BRAF mutations in cutaneous melanoma and CRKL amplifications in acral melanoma.
  • CRKL-driven tumors in zebrafish models predominantly formed in fins, precursors to limbs.
  • Acral melanocytes possess a positional identity gene program (HOX13) that synergizes with CRKL.
  • This synergy amplifies insulin-like growth factor (IGF) signaling, driving acral tumor formation.
  • Disrupting the CRKL-driven program removed the anatomic specificity of acral melanoma.

Conclusions:

  • Anatomic position is a critical determinant of oncogene susceptibility in melanoma.
  • A unique transcriptional state in acral melanocytes, involving HOX13 and CRKL, predisposes them to specific oncogenic insults.
  • Understanding positional effects is crucial for targeted cancer therapies.