1988
DOI: 10.1007/bf00057766
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Synaptic behaviour and recombination nodules in the human XY pair

Abstract: A sample of 90 XY pairs from men with normal karyotypes has been analyzed by measuring their morphological features in electron micrographs of microspread spermatocytes. The classification of human XY types (Solari, 1980) has been given stricter definitions. Stepwise splitting of the axes is seen in types 1 and 2. The development of axial branches and lengthening of the X axis is seen in type 3. In the two subtypes a and b of type 4 the net-like filamentous array grows in length to a maximum (average = 59.7 mi… Show more

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Cited by 15 publications
(10 citation statements)
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“…* The notion of SC as a scaffold for conversion of pairing interactions to crossovers explains situations in which SC is discontinuous but each patch of SC either includes a recombination nodule or occurs specifically at positions where chiasmata are subsequently seen (11,78,85 Additional observations support the general notion that axial structure is important for maintaining intersister connections as follows. In Triatoma infestans, autosomes segregate reductionally at meiosis I, while sex chromosomes segregate equationally; autosomes have axial elements and SC, while sex chromosomes have neither feature (39).…”
Section: )mentioning
confidence: 83%
“…* The notion of SC as a scaffold for conversion of pairing interactions to crossovers explains situations in which SC is discontinuous but each patch of SC either includes a recombination nodule or occurs specifically at positions where chiasmata are subsequently seen (11,78,85 Additional observations support the general notion that axial structure is important for maintaining intersister connections as follows. In Triatoma infestans, autosomes segregate reductionally at meiosis I, while sex chromosomes segregate equationally; autosomes have axial elements and SC, while sex chromosomes have neither feature (39).…”
Section: )mentioning
confidence: 83%
“…1984;Schmid et al. 1987;Solari, 1988). In the mole vole Ellobius talpinus, sex-chromosome pairing is initiated from both ends of the acrocentric X and Y chromosomes, resulting in a unique con figuration with tw'o SC segments and an asynapsed interstitial re gion (Bogdanov et al.…”
Section: Discussionmentioning
confidence: 99%
“…Additional association or pairing between the free ends of the sex chromosomes has already been described in pigs (Switonski and Gustavsson, 1986). The same phenomenon has also been observed in human spermatocytes (Chandley et al, 1984;Solari, 1988 It is known that unspecific association between the sex bivalent and autosomal configuration, particularly consisting of rearranged chromosomes (trivalents, quadrivalents, etc), can cause activation of an X chromosome in primary spermatocytes, which is responsible for the arrest of spermatogenesis (Lifschytz and Lindsley, 1972). In the present case, as well as in other cases of inversions described by other authors, no associations between the sex bivalent and the autosomal bivalent carrying an inversion were found.…”
Section: Introductionmentioning
confidence: 53%