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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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ZFP628 Is a TAF4b-Interacting Transcription Factor Required for Mouse Spermiogenesis.

Eric A Gustafson1, Kimberly A Seymour1, Kirsten Sigrist1

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Summary

Transcription factor TAF4b interacts with ZFP628, a novel cofactor crucial for male fertility. ZFP628 deficiency causes germ cell arrest and infertility by impairing spermiogenesis.

Keywords:
TAF4bTFIIDZFP628male fertilitymeiosisspermatogenesisspermiogenesistranscription

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Area of Science:

  • Reproductive Biology
  • Molecular Genetics
  • Developmental Biology

Background:

  • TAF4b, a TFIID complex subunit, is vital for mouse fertility and highly expressed in reproductive organs.
  • TAF4b deficiency in male mice leads to spermatogenesis defects and infertility.
  • Understanding TAF4b's transcriptional role in spermatogenesis is crucial.

Purpose of the Study:

  • To identify novel TAF4b-interacting proteins involved in spermatogenesis.
  • To elucidate the functional role of ZFP628 in male germ cell development and fertility.

Main Methods:

  • Two-hybrid screening to identify TAF4b interacting partners.
  • CRISPR-Cas9 gene editing to disrupt ZFP628 expression in mice.
  • Coimmunoprecipitation and deletion analysis to confirm protein interactions.
  • Analysis of gene expression (Tnp1, Tnp2, Prm1, Prm2) and germ cell morphology.

Main Results:

  • ZFP628 was identified as a novel TAF4b-interacting transcriptional cofactor.
  • Direct interaction between TAF4b and ZFP628 was confirmed via deletion analysis and coimmunoprecipitation.
  • ZFP628-deficient mice exhibited postmeiotic germ cell arrest at the round spermatid stage, leading to infertility.
  • Reduced mRNA expression of transition proteins (Tnp1, Tnp2) and protamines (Prm1, Prm2) was observed in ZFP628-deficient mice.

Conclusions:

  • TAF4b and ZFP628 form a novel functional association in the testis.
  • ZFP628 is a critical transcriptional regulator of stage-specific spermiogenesis.
  • ZFP628 plays a key role in male germ cell maturation and maintaining fertility.