leptotene


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leptotene

(ˈlɛptəʊˌtiːn)
n
(Biochemistry) the first stage of the prophase of meiosis during which the nuclear material becomes resolved into slender single-stranded chromosomes
[C20: from lepto- + -tene, from Greek tainia band, filament]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.leptotene - the first stage of the prophase of meiosis
prophase - the first stage of meiosis
synapsis - the side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis
phase, stage - any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected"
References in periodicals archive ?
At the stages of meiotic prophase I (i.e., leptotene, zygotene and pacyhtene), the sex chromosomes were positively heteropycnotic and large X1 and X2 associated with each other.
Type A spermatogonia at the basal lamina of seminiferous tubules, as well as primary spermatocytes in the leptotene and pachytene stages of prophase I, were also observed in the seminiferous epithelium.
CA, cortical alveoli; AF, atretic follicle; BM, basement membrane; F, follicle cell; FG, full-grown oocyte; LO, leptotene oocytes; N, nucleus; NU, perinuclear nucleoli; OF, ovarian follicle; OG, oogonium; OL, ovarian lumen; PF, prefollicle cells; PG, primary growth oocyte; PO, pachytene oocyte; SG, secondary growth oocyte; Y, yolk globule; ZP, zona pellucida.
During the leptotene stage of prophase I, DSB formation occurs alongside the development of the axial element, a proteinaceous axis comprising various proteins including cohesin [145].
Tight junction not only establishes a specialized microenvironment for spermatogenesis but also permits the regular passage of preleptotene and leptotene spermatocytes across the BTB for further development [7].
Primary spermatocytes, stained with the anti-SCP3 antibody, were selected to evaluate the respective percentages of leptotene, zygotene, pachytene and diplotene stages.
The preleptotene spermatocytes enter prophase I of meiosis, transform into leptotene, zygotene, pachytene and diplotene cells, which then quickly finish meiosis I forming secondary spermatocytes.
Early prophasic Leptotene, Oogonia enter into meiosis, stage (CN) zygotene, giving rise to oocytes.