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Organ distribution of apolipoprotein gene transcripts in 6-12 week postfertilization human embryos
Insights
Human embryos show widespread transcription of apolipoprotein genes in various organs, including the liver and yolk sac. This suggests a broader gene expression pattern in embryonic development compared to adults.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Human Embryology
Background:
- Apolipoproteins are crucial for lipid transport.
- Gene expression patterns of apolipoproteins in human embryos are not fully understood.
Purpose of the Study:
- To investigate the expression of apolipoprotein genes in human embryonic tissues.
- To compare embryonic apolipoprotein gene transcription with adult patterns.
Main Methods:
- Detection of RNA transcripts using molecular techniques.
- Analysis of gene expression in liver, yolk sac, gut, adrenals, kidneys, and heart of human embryos (6-12 weeks postfertilization).
Main Results:
- RNA transcripts for apolipoproteins AI, AII, B, CII, CIII, and E were detected in the liver and yolk sac.
- Apolipoprotein CIII mRNA was more abundant in the yolk sac than in the liver.
- Most apolipoprotein genes (except AII) were found in the gut and adrenals; kidneys and heart also showed some transcripts.
Conclusions:
- Human apolipoprotein genes are transcribed in a wider array of embryonic organs than in adults.
- This widespread transcription occurs in organs lacking endoderm, suggesting novel developmental roles.
Abstract:
In the liver and the yolk sack of 6-12 week postfertilization human embryos, we have detected RNA transcripts from the following apolipoprotein genes: AI, AII, B, CII, CIII and E. The mRNA from the apolipoprotein CIII gene was relatively more abundant in the total RNA from the yolk sack than in that from the liver. The gut and adrenals contained transcripts of all these apolipoprotein genes apart from apolipoprotein AII. The kidneys and heart contained some apolipoprotein transcripts. In conjunction with previous studies, these results suggest that in the human embryo apolipoprotein genes are transcribed in a much larger range of organs than is the case in the adult. Many of these organs lack endoderm tissues.