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The Journal of Heredity 2002:93(2)
© 2002 The American Genetic Association 93:125-129

Crossing Over in Chicken Oogenesis: Cytological and Chiasma-Based Genetic Maps of the Chicken Lampbrush Chromosome 1

A. V. Rodionov, N. A. Lukina, S. A. Galkina, I. Solovei, and S. Saccone

From the Biological Institute, St. Petersburg State University, Stary Peterhof, St. Petersburg 198504, Russia (Rodionov, Lukina, and Galkina), Zoology Department, Leicester University, Leicester, England (Rodionov and Solovei), Institute fuer Anthropologie und Humangenetik, Ludwig Maximilian Universitaet, Muenchen, Germany (Solovei), and Dipartimento di Protezione e Valorizzazione Agroalimentare—Sez. Allevamenti Zootecnici, University of Bologna, via F.lli Rosselli, 107, Reggio Emilia, Italy (Saccone). Different parts of this work were supported by the Royal Society, INTAS (grant no. 97-1610), the Russian Basic Research Foundation (grant no. 00-04-49327).

Address correspondence to Alexander V. Rodionov at the address above or e-mail: Alexander.Rodionov@pobox.spbu.ru.

Chiasmata in diplotene bivalents are located at the points of physical exchange (crossing-over) between homologous chromosomes. We have studied chiasma distribution within chicken lampbrush chromosome 1 to estimate the crossing-over frequency between chromosome landmarks. The position of the centromere and chromosome region 1q3.3–1q3.6 on lampbrush chromosome 1 were determined by comparative physical mapping of the TTAGGG repeats in the chicken mitotic and lampbrush chromosomes. The comparison of the chiasma (=crossing over)-based genetic distances on chicken chromosome 1 with the genetic linkage map obtained in genetic experiments showed that current genetic distances estimated by the high-resolution genetic mapping of the East Lansing, Compton, and Wageningen chicken reference populations are 1.2–1.9 times longer than those based on chiasma counts. Conceivable reasons for this discrepancy are discussed.


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