WEE1

Review rationale: WEE1 is a conserved CDK-inhibitory kinase, but mammalian oocyte studies distinguish somatic WEE1 from WEE2/Wee1B. A mitotic checkpoint mechanism does not automatically establish regulation of meiosis I. Broad meiotic participation cannot be excluded without horse-specific expression and perturbation evidence. Later Wee2 knockout mice retain fertility, reinforcing that this evidence should not be generalized to absolute indispensability or absence of compensation.

Review rationale: Human experiments place the soluble checkpoint kinase in the nucleus. Full-length horse sequence conservation supports nucleoplasmic activity; this is more specific than the frozen horse nucleus annotation.

Review rationale: The characterized WEE1 checkpoint pool is nuclear, with additional cytoplasmic annotations. No primary evidence retrieved establishes plasma-membrane recruitment of the selected horse protein. A soluble kinase can associate peripherally with a membrane, so absence of a transmembrane helix does not refute the prediction.

Review rationale: The mouse egg-activation experiment distinguishes WEE2/Wee1B depletion, which blocks pronucleus formation, from WEE1/Wee1A depletion, which does not in that assay. The selected horse sequence is a close full-length WEE1 match, making paralog transfer a plausible explanation. However, differential necessity does not exclude participation, and later Wee2 knockout mice retain substantial fertility with possible compensation. Without horse oocyte expression and perturbation evidence, this specific biological-process prediction remains uncertain rather than definitively refuted.

Review rationale: Protein phosphorylation follows directly from the conserved WEE1 tyrosine-kinase reaction. This is correct but broad relative to its specific CDK-inhibitory mechanism.

Review rationale: WEE1 catalyzes inhibitory CDK phosphorylation, which supports protein phosphorylation. A separate positive-regulation-of-phosphorylation process requires identifying the regulated reaction; the direct catalytic reaction alone does not establish that regulatory relationship, and effects on downstream CDK phosphorylation are inhibitory.

Review rationale: Mammalian studies identify WEE2/Wee1B as the oocyte-enriched paralog, whereas this horse sequence is WEE1. The broad female-meiosis term is not validated by conserved kinase activity alone. Redundancy and species-specific expression leave possible participation unresolved rather than proving absence. Later Wee2 knockout mice retain fertility, reinforcing that this evidence should not be generalized to absolute indispensability or absence of compensation.