The fetal thymus has a unique genomic copy number profile resulting from physiological T cell receptor gene rearrangement. Academic Article uri icon

Overview

abstract

  • Somatic mosaicism, the presence of genetically distinct cells within an organism, has been increasingly associated with human morbidity, ranging from being a cause of rare syndromes to a risk factor for common disorders such as malignancy and cardiovascular disease. Previous studies interrogating the normal prevalence of somatic mosaicism have focused on adults. We here present an estimate of the baseline frequency of somatic mosaic copy number variation (CNV) at the time around birth, by sampling eight different organs from a total of five fetuses and newborns. Overall we find a significantly lower frequency of organ specific (i.e. mosaic) CNVs as compared to adults (p = 0.003; Mann-Whitney U-test). The rate of somatic CNV in adults has been estimated to around 2.2 CNV per organ assayed. In contrast, after stringent filtering, we found no organ-private CNVs in fetuses or newborns with exception of the thymus. This organ exhibited a specific genome profile in the form of deletions resulting from polyclonal T-cell receptor rearrangements. This implies that somatic non-immune related CNVs, if present at birth, are typically confined to very small cell populations within organs.

publication date

  • March 24, 2016

Research

keywords

  • DNA Copy Number Variations
  • Gene Rearrangement, T-Lymphocyte
  • Genes, T-Cell Receptor
  • Thymus Gland

Identity

PubMed Central ID

  • PMC4806331

Scopus Document Identifier

  • 84962315560

Digital Object Identifier (DOI)

  • 10.1073/pnas.1311163110

PubMed ID

  • 27009469

Additional Document Info

volume

  • 6