In the absence of the AZFc region, the transient zygotene stage is extended, and chromosome condensation is reduced. The low level of limited asynapsis, the normal H2AX staining and the incomplete loss of germ cells at the pachytene checkpoint indicate that the AZFc region is not critical for meiotic recombination. We suggest that the pachytene phenotype develops secondarily to a primary defect that influences meiosis.
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