Loop Formation and Synaptic Adjustment in a Human Male Heterozygous for Two Pericentric Inversions

Overview

Journal Chromosoma

Specialty Molecular Biology

Date 1986 Jan 1

PMID 3698745

Citations 14

Authors

M R Guichaoua

D Delafontaine

R Taurelle

J L Taillemite

M R Morazzani

J M Luciani

Affiliations

Soon will be listed here.

Abstract

Pachytene analysis was undertaken in an infertile male heterozygous for two pericentric inversions of chromosomes 1 and 9. The synaptic behaviour of the bivalent 1 inversion was the most informative. Analysis of the chromomere pattern combined with centromeric heterochromatin staining allowed precise description of synaptic initiation and extension leading to the homosynapsed loop. These techniques also allowed demonstration of the existence of heterosynapsis following alignment of the inverted segments. Non-homologous synapsed bivalents had the morphological aspects of straight bivalents with two distant blocks of centromeric heterochromatin. The numbering of the autosomal bivalent chromomeres at various successive phases of the inversion loop behaviour of bivalent 1 permitted us an alternative approach to the timing of pachytene.

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