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Meiotic recombination analysis in female ducks (Anas platyrhynchos)

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An Erratum to this article was published on 14 September 2016

Abstract

Meiotic recombination in female ducks was directly studied by immunolocalization of MLH1 protein, a mismatch repair protein of mature recombination nodules. In total, 6820 crossovers were scored along the autosomal synaptonemal complexes in 122 meiotic nuclei. From this analysis we predict that the female map length of the duck is 2845 cM, with a genome wide recombination rate of 2 cM/Mb. MLH1-focus mapping along the six largest bivalents shows regional variations of recombination frequencies that can be linked to differences in chromosome morphology. From this MLH1 mapping it can be inferred that distally located markers will appear more separated in genetic maps than physically equidistant markers located near the centromeres on bivalents 1 and 2. Instead, markers at interstitial positions on the acrocentric bivalents 3–6 will appear more tightly linked than expected on the basis of their physical distance because recombination is comparatively lower at the mid region of these chromosomes. The present results provide useful information to complement linkage mapping in ducks and extend previous knowledge about the variation of recombination rates among domestic Galloanserae.

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Acknowledgments

Research in our laboratory is funded by grants PIP 003 from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and PICT 0059 from Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT). Support from the University of Buenos Aires is gratefully acknowledged. M.I.P. is a member of CONICET and L.d.P. is the recipient of a doctoral fellowship from CONICET.

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Correspondence to M. I. Pigozzi.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s10709-016-9922-1.

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Pigozzi, M.I., del Priore, L. Meiotic recombination analysis in female ducks (Anas platyrhynchos). Genetica 144, 307–312 (2016). https://doi.org/10.1007/s10709-016-9899-9

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  • DOI: https://doi.org/10.1007/s10709-016-9899-9

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