Role of the Ped gene and apoptosis genes in control of preimplantation development.

Abstract:

PURPOSE:The properties of the mouse Ped gene and the genes that mediate apoptosis in mediating preimplantation embryonic survival were reviewed. METHODS:Preimplantation mouse oocytes and embryos were evaluated microscopically and biochemically for rate of development, degree of fragmentation, and gene expression to correlate these characteristics with embryo mortality, Biochemical assays included PCR for DNA analysis, RT-PCR for mRNA analysis, immuno-PCR for protein analysis, and TUNEL assay for assessment of apoptosis. RESULTS:Using the mouse as a model system we have identified a gene that controls the rate of development, the Ped gene. The Ped gene product is a class Ib major histocompatibility complex protein called the Qa-2 antigen. Research to understand the molecular mechanisms of Ped gene action and to identify the human homologue of the Ped gene is under way. We have also shown using the mouse model, that fragmented embryos show the morphological and biochemical characteristics of apoptosis. Genes in the two major gene families that regulate apoptosis, the caspase and Bcl-2 families, are expressed in mouse oocytes and preimplantation embryos. CONCLUSIONS:Preimplantation embryonic survival depends on two major morphological parameters: rate of development and degree of fragmentation. A fast rate of development and a low degree of fragmentation lead to a better chance of producing live offspring. Both rate of development and degree of fragmentation are genetically controlled, the former by the Ped gene and the latter most likely by genes that mediate apoptosis. It seems probable that regulation of apoptosis will prove to be a major mechanism that mediates oocyte and preimplantation embryonic survival.

journal_name

J Assist Reprod Genet

authors

Warner CM,McElhinny AS,Wu L,Cieluch C,Ke X,Cao W,Tang C,Exley GE

doi

10.1023/a:1022560914833

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

331-7

issue

5

eissn

1058-0468

issn

1573-7330

journal_volume

15

pub_type

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