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Conserved alternative and antisense transcripts at the programmed cell death 2 locus.

Ondrej Mihola1, Jiri Forejt, Zdenek Trachtulec

  • 1Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Center for Applied Genomics, Videnska 1083, 142 20 Prague, Czech Republic. mihola@biomed.cas.cz <mihola@biomed.cas.cz>

BMC Genomics
|January 20, 2007
PubMed
Summary
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The programmed cell death 2 (Pdcd2) gene exhibits conserved alternative transcription across species, suggesting a crucial role for truncated proteins. Antisense transcripts may regulate Pdcd2 expression, highlighting potential non-coding RNA functions.

Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • The programmed cell death 2 (Pdcd2) gene was investigated for its role in conserved synteny, imprinting, and potential association with Hybrid sterility 1 (Hst1).

Purpose of the Study:

  • To characterize novel transcripts at the Pdcd2 locus, including alternative mRNAs and antisense RNAs.
  • To investigate the evolutionary conservation of Pdcd2 alternative splicing and its potential regulatory mechanisms.
  • To evaluate the candidacy of Pdcd2 for Hybrid sterility 1 and imprinting.

Main Methods:

  • Identification and characterization of novel mouse transcripts using RNA sequencing.
  • Analysis of alternative splicing in Pdcd2 and TBP genes across species (mouse, human, chicken).
  • Allelic sequencing and transcription studies to assess gene regulation and imprinting.

Related Experiment Videos

Main Results:

  • Discovery of alternative Pdcd2 mRNA variants and antisense RNAs, including those overlapping the Pdcd2 gene and TATA-binding protein (Tbp) gene.
  • Detection of analogous C-terminal truncating PDCD2 forms in humans and chickens, with conserved sense-antisense overlaps.
  • No evidence found supporting Pdcd2's candidacy for Hst1 or imprinted expression in embryos.

Conclusions:

  • The conservation of alternative Pdcd2 transcription suggests functional importance of truncated PDCD2 proteins, potentially with opposing roles to the constitutive form.
  • Tissue-specific differences in Pdcd2 mRNA ratios indicate a developmental role for alternative splicing.
  • Pdcd2/Tbp antisense transcripts may regulate Pdcd2 transcription, and conserved overlaps suggest biological relevance. Some database entries labeled 'noncoding' may represent incomplete alternative cDNAs.