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Ann Genet 1992;35(1):3-7
Institut d'Embryologie, Faculte de Medecine, Strasbourg, France.
The authors report here two new cases of reciprocal translocations in two
fertile and hypoprolific boars. Silver stained synaptonemal complexes in
surface-spread pachytene nuclei from a boar heterozygous for a reciprocal
translocation, and from another one carrying two different reciprocal
translocations, were analyzed by electron microscopy. In such heterozygotes,
cross-shaped quadrivalent configurations are expected to form in order to
allow homologous pairing. In the same boar, the lengths of the fully synapsed
arms of the quadrivalent varies from one quadrivalent to the other and
heterosynapsis was obvious. Heterosynapsis was also observed with asymmetrical
pairing of the non-homologous partners of the quadrivalent. This heterosynapsis
is assumed to be a mechanism preventing spermatocyte loss, but inducing a
secondary segregational type of impairment of fertility due to foetal wastage
leading to reduced prolificacy.
PMID: 1610117, UI: 92303986
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