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Genome-wide analysis of the maternal-to-zygotic transition in Drosophila primordial germ cells.

Abstract：

BACKGROUND:During the maternal-to-zygotic transition (MZT) vast changes in the embryonic transcriptome are produced by a combination of two processes: elimination of maternally provided mRNAs and synthesis of new transcripts from the zygotic genome. Previous genome-wide analyses of the MZT have been restricted to whole embryos. Here we report the first such analysis for primordial germ cells (PGCs), the progenitors of the germ-line stem cells. RESULTS:We purified PGCs from Drosophila embryos, defined their proteome and transcriptome, and assessed the content, scale and dynamics of their MZT. Transcripts encoding proteins that implement particular types of biological functions group into nine distinct expression profiles, reflecting coordinate control at the transcriptional and posttranscriptional levels. mRNAs encoding germ-plasm components and cell-cell signaling molecules are rapidly degraded while new transcription produces mRNAs encoding the core transcriptional and protein synthetic machineries. The RNA-binding protein Smaug is essential for the PGC MZT, clearing transcripts encoding proteins that regulate stem cell behavior, transcriptional and posttranscriptional processes. Computational analyses suggest that Smaug and AU-rich element binding proteins function independently to control transcript elimination. CONCLUSIONS:The scale of the MZT is similar in the soma and PGCs. However, the timing and content of their MZTs differ, reflecting the distinct developmental imperatives of these cell types. The PGC MZT is delayed relative to that in the soma, likely because relief of PGC-specific transcriptional silencing is required for zygotic genome activation as well as for efficient maternal transcript clearance.

journal_name

Genome Biol

journal_title

Genome biology

authors

Siddiqui NU,Li X,Luo H,Karaiskakis A,Hou H,Kislinger T,Westwood JT,Morris Q,Lipshitz HD

doi

10.1186/gb-2012-13-2-r11

subject

Has Abstract

pub_date

2012-02-20 00:00:00

pages

R11

issue

2

eissn

1474-7596

issn

1474-760X

pii

gb-2012-13-2-r11

journal_volume

13

pub_type

杂志文章

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