Expression of mitochondrial transcription factor A (TFAM) during porcine gametogenesis and preimplantation embryo development.

Abstract:

:Mitochondrial transcription factor A (TFAM) is responsible for stability, maintenance, and transcriptional control of mitochondrial DNA (mtDNA). We have studied the expression and distribution of TFAM in the gametes and preimplantation embryos of the domestic pig (Sus scrofa). We hypothesized that TFAM is not present in the boar sperm mitochondria to reduce the possibility of paternal mtDNA propagation in the progeny. In contrast, we anticipated that Tfam gene is expressed in a developmental stage-dependent manner in porcine oocytes and embryos. The appropriate TFAM band of 25 kDa was detected by Western blotting in ejaculated boar spermatozoa, as well as in porcine oocytes and zygotes. Boar sperm extracts also displayed several bands >25 kDa suggestive of post-translational modification by ubiquitination, confirmed by affinity purification of ubiquitinated proteins. TFAM immunoreactivity was relegated to the sperm tail principal piece and sperm head in fully differentiated spermatozoa. The content of Tfam mRNA increased considerably from the germinal vesicle to blastocyst stage and also between in vitro fertilized and cultured blastocysts compared to in vivo-derived blastocysts. TFAM protein accumulated in the oocytes during maturation and was reduced by proteolysis after fertilization. This pattern was not mirrored in parthenogenetically activated oocytes and zygotes reconstructed by SCNT, suggesting deviant processing of TFAM protein and transcript after oocyte/embryo manipulation. Thus, TFAM may exert a critical role in porcine gametogenesis and preimplantation embryo development. Altogether, our data on the role of TFAM in mitochondrial function and inheritance have broad implications for cell physiology and evolutionary biology.

journal_name

J Cell Physiol

authors

Antelman J,Manandhar G,Yi YJ,Li R,Whitworth KM,Sutovsky M,Agca C,Prather RS,Sutovsky P

doi

10.1002/jcp.21528

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

529-43

issue

2

eissn

0021-9541

issn

1097-4652

journal_volume

217

pub_type

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