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Using next-generation RNA sequencing to identify imprinted genes.

X Wang1, A G Clark1

  • 11] Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA [2] Cornell Center for Comparative and Population Genomics, Cornell University, Ithaca, NY, USA.

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Summary
This summary is machine-generated.

Identifying imprinted genes requires assessing differential allelic expression (DAE) using RNA sequencing (RNA-seq) in offspring from reciprocal crosses. This method reveals the dynamic gain and loss of imprinted genes across species.

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Area of Science:

  • Genetics and Genomics
  • Molecular Biology
  • Developmental Biology

Background:

  • Genomic imprinting results in parent-of-origin-specific gene expression, known as differential allelic expression (DAE).
  • Identifying imprinted genes necessitates distinguishing parental contributions to allele expression.
  • Simple DAE observation in an individual is insufficient for definitive imprinting identification.

Purpose of the Study:

  • To detail a comprehensive methodology for identifying imprinted genes.
  • To leverage RNA sequencing (RNA-seq) for quantifying allele-specific expression in F1 offspring.
  • To provide a framework applicable to diverse biological studies of gene regulation.

Main Methods:

  • Utilizing RNA sequencing (RNA-seq) on tissues from F1 offspring of reciprocal crosses between distinct inbred parental lines.
  • Addressing critical technical aspects including tissue purity, RNA extraction, and library preparation.
  • Employing bioinformatic approaches for inferring imprinting status from RNA-seq data.

Main Results:

  • The outlined scheme enables robust identification of imprinted genes by analyzing allele-specific expression.
  • Application across various organisms highlights the evolutionary plasticity of imprinted gene landscapes.
  • Novel imprinted genes are observed to be gained and lost dynamically within genomes.

Conclusions:

  • The described RNA-seq based strategy is effective for identifying imprinted genes.
  • The methodology is adaptable for studying other forms of allele-specific expression, including cis-regulation and X-chromosome inactivation.
  • Genomic imprinting exhibits significant evolutionary fluidity, with rapid turnover of imprinted genes.