Related Experiment Video

Updated: May 12, 2026

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
10:30

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Published on: January 20, 2014

Activated Cdc42 kinase regulates Dock localization in male germ cells during Drosophila spermatogenesis

Abbas M Abdallah1, Xin Zhou, Christine Kim

  • 1Department of Biological Sciences, Purdue University, 915 West State Street, West Lafayette, IN 47907-2054, USA.

Developmental Biology
|April 9, 2013
PubMed

Insights

Activated Cdc42-associated kinase (ACK1) is crucial for sperm formation in fruit flies. Its tyrosine kinase activity and interaction with Dock protein are essential for male germ cell development, suggesting a conserved role in reproduction.

Area of Science:

  • Cell Biology
  • Genetics
  • Developmental Biology

Background:

  • The non-receptor tyrosine kinase ACK1 (Activated Cdc42-associated kinase) is linked to cancer progression and metastasis.
  • Understanding the in vivo function of ACK1 is crucial for cancer research.

Purpose of the Study:

  • To investigate the in vivo function of the Drosophila homolog of ACK1, named Ack.
  • To characterize the developmental role of Ack in fruit flies.

Main Methods:

  • Generated a null mutation in Drosophila Ack.
  • Analyzed developmental defects in male germ cells and eye discs.
  • Investigated protein interactions and localization using biochemical and imaging techniques.

Main Results:

  • Ack is essential for sperm formation but not for viability in fruit flies.
  • Ack's tyrosine kinase activity is required for its function in male germ cells.
  • Ack regulates the subcellular distribution of Dock, a homolog of Nck, in male germ cells.
  • Ack and Dock form a complex, and Dock localization depends on its SH2 domain.

Conclusions:

  • Ack-dependent tyrosine phosphorylation is critical for recruiting Dock, thereby promoting sperm differentiation.
  • These findings suggest a conserved role for Ack in male reproductive development.

More Related Videos

Spatial and Temporal Analysis of Active ERK in the C. elegans Germline08:40

Spatial and Temporal Analysis of Active ERK in the C. elegans Germline

Published on: November 29, 2016

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad09:08

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

Published on: October 17, 2020

Related Concept Videos

Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Anaphase Promoting Complex00:50

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
Positive Regulator Molecules02:39

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Meiosis II02:02

Meiosis II

Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...