Protein trafficking
SNARE timing in sperm acrosome exocytosis
Open access · cc by · source: Europe PMC
Sperm acrosome exocytosis proceeds via ordered SNARE assembly/disassembly around intra-acrosomal Ca2+ release.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Permeabilized sperm plus staged inhibitors and photolabile Ca2+ chelators ordered acrosome exocytosis: Rab3A acts before intra-acrosomal Ca2+ efflux; SNAREs and synaptotagmin act after to complete fusion. Immunofluorescence of fusion factors here is timed biochemistry in a stripped-down cell, not every in-vivo regulatory layer.
Evidence for the claim as stated.
Permeabilized-sperm SNARE timing and live epithelial polarity/spike trafficking disagree about how much native membrane regulation is still present. In-vitro sperm may miss in-vivo layers; enteroids and pseudovirus spike assays only approximate infection of a human airway or gut.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
Permeabilized-sperm SNARE timing and live epithelial polarity/spike trafficking disagree about how much native membrane regulation is still present. In-vitro sperm may miss in-vivo layers; enteroids and pseudovirus spike assays only approximate infection of a human airway or gut.
Study at a glance
- Design
- Animal / in-vitro — Staged inhibitors and photolabile Ca²⁺ chelators in permeabilized sperm to order fusion factors
- N
- Cell-biology ordering experiments — no single primary analytic N in stored text
- Population
- Permeabilized sperm undergoing acrosomal exocytosis
- Outcome
- Temporal order of Rab3A and SNARE/synaptotagmin steps in acrosomal fusion
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
SNARE timing in sperm acrosome exocytosis
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Sperm acrosomal exocytosis.
Several of the proteins involved have been identified and characterized by genetic approaches, reconstitution assays, and biochemical means.
SNARE proteins and regulators.
The current consensus paradigm for membrane fusion is based on results obtained from diverse cellular systems, ranging from yeast to neurons.
Key findings
Rab3A acts before intra-acrosomal Ca2+ efflux; SNAREs/synaptotagmin act after to complete fusion.
Methodology
Used staged inhibitors and photolabile Ca2+ chelators in permeabilized sperm to order fusion factors.
Limitations
In vitro permeabilized sperm may not capture every in vivo regulatory layer.
Related papers in this topic
Same topic cluster — not a recommendation engine.