当前位置： SCI文献检索 > DEVELOPMENTAL BIOLOGY期刊下所有文献 > Growing dictyate oocytes, but not early preimplantation embryos, of the mouse display high levels of DNA homologous recombination by single-strand annealing and lack DNA nonhomologous end joining.

Growing dictyate oocytes, but not early preimplantation embryos, of the mouse display high levels of DNA homologous recombination by single-strand annealing and lack DNA nonhomologous end joining.

Abstract：

:We have investigated the ability of growing dictyate oocytes and early preimplantation embryos of the mouse to process extrachromosomal DNA molecules with free ends by intranuclearly microinjecting DNA fragments containing a region of homology of various extent at either the 5' or 3' terminus. Homologous recombination of these fragments by single-strand annealing (SSA), but not other DNA recombination/joining mechanisms, resulted in the formation of a full-length hsp-lacZ-pA fusion gene that was transcriptionally activated by heat shock in growing oocytes and spontaneously at the early two-cell stage in the embryos, making it possible to quantitatively evaluate SSA activities of these cells by the beta-galactosidase produced. SSA activities of oocytes and embryos were similar in their general properties and in the activity levels observed with saturating amounts of DNA. However, embryo SSA was almost one order of magnitude less effective than that of oocytes. Oocyte and embryo 5' --> 3' exonuclease (a key function of the SSA pathway) and DNA nonhomologous end joining (NHEJ) activities were also investigated using an asymmetric PCR assay. Results showed that NHEJ is lacking in oocytes and is very prominent in the embryos, where it competes with SSA for the injected DNA.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Fiorenza MT,Bevilacqua A,Bevilacqua S,Mangia F

doi

10.1006/dbio.2001.0199

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

214-24

issue

1

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(01)90199-X

journal_volume

233

pub_type

杂志文章

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