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Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
11:02

Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1

Published on: May 27, 2016

Two functional forms of ACRBP/sp32 are produced by pre-mRNA alternative splicing in the mouse

Yoshinori Kanemori1, Jin-Hyeob Ryu, Mai Sudo

  • 1Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan.

Biology of Reproduction
|February 22, 2013
PubMed

Insights

Mouse ACRBP protein has two forms, ACRBP-V5 and ACRBP-C, involved in sperm development. ACRBP-V5 aids in pro-ACR transport, while ACRBP-C promotes acrosome reaction, crucial for fertilization.

Area of Science:

  • Reproductive Biology
  • Molecular Cell Biology
  • Spermatogenesis Research

Background:

  • Acrosomal protein B (ACRBP) binds precursor (pro-ACR) and intermediate forms of sperm serine protease ACR.
  • Understanding ACRBP's role in mouse spermatogenesis and epididymal sperm is crucial for reproductive health research.

Purpose of the Study:

  • To investigate the expression pattern, localization, and function of mouse ACRBP in spermatogenic cells and epididymal sperm.
  • To elucidate the distinct roles of ACRBP variants in pro-ACR processing and acrosomal function.

Main Methods:

  • Analysis of alternative splicing in mouse Acrbp mRNA, generating wild-type (ACRBP-W) and variant (ACRBP-V5) forms.
  • Immunohistochemical localization of ACRBP variants and pro-ACR in spermatogenic cells and sperm.
  • Glutathione S-transferase pull-down assays to determine binding interactions between ACRBP variants and pro-ACR.

Main Results:

  • Two mouse Acrbp mRNA forms, Acrbp-W and Acrbp-V5, result from alternative splicing.
  • ACRBP-W is processed to ACRBP-C; ACRBP-V5 is present in early spermatids but absent in elongating ones.
  • ACRBP-V5 and ACRBP-C bind different regions of pro-ACR, with ACRBP-C accelerating pro-ACR autoactivation.

Conclusions:

  • ACRBP-V5 likely functions in pro-ACR transport and packaging into acrosomal granules during spermiogenesis.
  • ACRBP-C may promote ACR release during acrosomal exocytosis, facilitating fertilization.
  • Differential roles of ACRBP variants are critical for regulating acrosomal function in sperm.

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