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Cytogenetics in the genomic era.

Isabel Granada1, Laura Palomo2, Neus Ruiz-Xivillé1

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Best Practice & Research. Clinical Haematology
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Summary

Cytogenetics, including chromosome banding and advanced techniques like next-generation sequencing, is crucial for diagnosing and predicting outcomes in hematological neoplasms. While new technologies offer higher resolution, standardization challenges remain for widespread clinical use.

Keywords:
Chromosomal bandingDNA microarraysFluorescence in situ hybridizationHaematologic neoplasmsLeukaemiaLymphomaNext generation sequencing

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Area of Science:

  • Hematology
  • Genetics
  • Oncology

Background:

  • Hematological neoplasms frequently exhibit chromosomal abnormalities, necessitating cytogenetic analysis for diagnosis and prognosis.
  • Chromosome banding is standard for specific leukemias and myelodysplastic syndromes.
  • Other myeloid neoplasms, lymphoid leukemias, lymphomas, and myeloma require complementary techniques like FISH or microarrays.

Purpose of the Study:

  • To review the essential role of cytogenetics in diagnosing and prognosing hematological neoplasms.
  • To discuss the evolution of cytogenetic technologies from banding to next-generation sequencing.
  • To highlight the strengths and limitations of current cytogenetic methods in clinical practice.

Main Methods:

  • Review of cytogenetic techniques including chromosome banding, fluorescence in situ hybridization (FISH), and microarrays.
  • Discussion of the application of next-generation sequencing (NGS) in routine hematological analysis.
  • Evaluation of the diagnostic and prognostic utility of these methods.

Main Results:

  • Chromosome banding is mandatory for certain hematological neoplasms.
  • FISH and microarrays are essential for detecting cryptic alterations and translocations missed by banding.
  • NGS provides high-resolution analysis of mutations and copy number alterations but requires further standardization.

Conclusions:

  • Cytogenetic analysis is indispensable for the accurate diagnosis and prognosis of hematological neoplasms.
  • Technological advancements like NGS offer enhanced sensitivity and resolution but face challenges in clinical implementation.
  • A combination of traditional and novel techniques ensures comprehensive genomic evaluation.