Spermatogenesis in heterozygotes for Robertsonian chromosomal rearrangements from natural populations of the common shrew, Sorex araneus

S. Garagna, M. Zuccotti, J. B. Searle, C. A. Redi, P. J. Wilkinson

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Twenty-two adult male common shrews were collected from 5 sites in the vicinity of Oxford (UK) close to the zone of hybridization between two karyotypic races. The shrews were subdivided into 3 karyotypic categories: homozygotes, simple Robertsonian heterozygotes (which form one or more trivalents at prophase I of meiosis) and complex Robertsonian heterozygotes (which form a quadrivalent). The ratio of primary spermatocytes to round spermatids was determined from transverse sections of seminiferous tubules, to provide an indication of germ cell death. In no individual was there severe germ cells loss. Homozygotes had the highest mean spermatocyte: spermatid ratio and complex heterozygotes the lowest, but there was substantial individual variation and the differences were not significant. Complex heterozygotes also had a higher proportion of defective seminiferous tubules and lower testis weights than did other categories and it is reasonable to propose that, as a population, complex heterozygotes have reduced fitness relative to other categories on the basis of spermatogenic performance. However, there is no evidence from studies of spermatogenesis that simple Robersonian heterozygotes are less fit than homozygotes.

Original languageEnglish
Pages (from-to)431-438
Number of pages8
JournalJournal of Reproduction and Fertility
Volume87
Issue number2
Publication statusPublished - 1989

Fingerprint

Shrews
Spermatogenesis
Heterozygote
Homozygote
Population
Seminiferous Tubules
Spermatocytes
Spermatids
Germ Cells
Meiotic Prophase I
Meiosis
Individuality
Testis
Cell Death
Weights and Measures

ASJC Scopus subject areas

  • Developmental Biology
  • Molecular Biology
  • Physiology
  • Embryology
  • Obstetrics and Gynaecology

Cite this

Spermatogenesis in heterozygotes for Robertsonian chromosomal rearrangements from natural populations of the common shrew, Sorex araneus. / Garagna, S.; Zuccotti, M.; Searle, J. B.; Redi, C. A.; Wilkinson, P. J.

In: Journal of Reproduction and Fertility, Vol. 87, No. 2, 1989, p. 431-438.

Research output: Contribution to journalArticle

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