Biparental inheritance of RAPD markers in males of the pseudo-arrhenotokous mite Typhlodromus pyri.

Abstract:

:In pseudo-arrhenotokous mites, haploid males develop from fertilized eggs that undergo paternal genome loss (PGL) during early embryogenesis. We present evidence that some of the paternal genome may be retained in males of the predatory mite Typhlodromus pyri Scheuten (Acari: Phytoseiidae). Two reproductively compatible populations were differentiated by two random amplified polymorphic DNA markers and the inheritance pattern in the offspring was analysed. Maternal transmission rates are variable and independent of the sex of the offspring and of the marker. These data suggest a nuclear origin and independent segregation of the markers. One marker (330 base pairs (bp)) was paternally transmitted to male as well as female offspring, the other (990 bp) was paternally transmitted to all females and some of the male offspring. We propose that the paternal set of inactivated chromosomes may be partially retained in some tissues of the haploid males or, alternatively, that a B chromosome does not follow the process of PGL in male embryos, thereby segregating with the maternal set. The possible mechanisms controlling the condensation and the segregation of the chromosome(s) retained are discussed on the basis of current hypotheses on chromosome inactivation in insects.

journal_name

Genome

journal_title

Genome

authors

Perrot-Minnot MJ,Navajas M

doi

10.1139/g95-110

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

838-44

issue

5

eissn

0831-2796

issn

1480-3321

pii

g95-110

journal_volume

38

pub_type

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