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Related Concept Videos

The Retinoblastoma Gene01:20

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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High resolution SNP array profiling identifies variability in retinoblastoma genome stability.

Berber M Mol1, Maarten P G Massink, Annemarie H van der Hout

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|November 20, 2013
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Summary
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Genomic analysis of retinoblastoma (Rb) reveals significant heterogeneity. While RB1 gene loss initiates Rb, copy number variations differ between hereditary and nonhereditary subtypes, impacting tumor progression.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Retinoblastoma (Rb) initiation typically involves the loss of both copies of the RB1 tumor suppressor gene.
  • Tumorigenesis and progression in Rb require additional genomic alterations beyond RB1 inactivation.

Purpose of the Study:

  • To investigate genomic heterogeneity among different clinical subtypes of retinoblastoma.
  • To identify specific copy number aberrations associated with hereditary versus nonhereditary Rb.

Main Methods:

  • Analysis of 21 Rb tumors (11 hereditary, 10 nonhereditary) using high-resolution single nucleotide polymorphism (SNP) arrays.
  • Validation of gene losses and gains using Multiplex Ligation-dependent Probe Amplification (MLPA).

Main Results:

  • Few focal genomic aberrations were detected; a focal gain on chromosome 2p24.3 encompassing the MYCN oncogene was most frequent.
  • Nonhereditary Rbs exhibited greater genomic instability compared to hereditary Rbs, particularly in younger patients.
  • Established aberrations like 1q gain and 16q loss were linked to nonhereditary Rbs with later diagnosis ages.

Conclusions:

  • Genomic profiles of retinoblastoma subtypes show considerable variation, influencing clinical presentation and progression.
  • Copy number neutral loss of heterozygosity on chromosome 13 (where RB1 is located) was common across all Rb types.
  • Focal amplifications/deletions and copy number neutral LOH outside chromosome 13 are infrequent in retinoblastoma.