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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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[Genome-wide diagnostics; after the results the real work begins].

N Bannink1, M Joosten2, A S Brooks2

  • 1Franciscus Gasthuis & Vlietland, afd. Kindergeneeskunde, Rotterdam/Schiedam.

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|February 9, 2021
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Summary

New genetic testing technologies like next-generation sequencing significantly improve genetic diagnosis. This case highlights the complexity of genetic tests and the need for expert interpretation and collaboration for congenital anomalies.

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Area of Science:

  • Medical Genetics
  • Genomic Medicine

Background:

  • Genetic testing technologies have advanced rapidly in the past decade.
  • Single nucleotide polymorphism arrays (SNP-arrays) are increasingly replaced by next-generation sequencing (NGS) methods.
  • NGS includes targeted genomic panels and whole exome sequencing, enhancing diagnostic yield.

Observation:

  • A clinical case involving a young girl with congenital vertebral and rib anomalies was investigated.
  • The case presented challenges in interpreting complex genetic test results.

Findings:

  • The diagnostic work-up underscored the intricate nature of genetic testing and the critical requirement for specialized knowledge and experience.
  • Effective interpretation necessitates close collaboration among pediatricians, clinical geneticists, and laboratory specialists.

Implications:

  • Interpreting complex genetic data requires multidisciplinary collaboration and expertise.
  • Long-term parental involvement is crucial throughout the diagnostic odyssey for rare genetic conditions.