leptotene

(ˈlɛptəʊˌtiːn)

(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]

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Noun

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"

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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.

A New Diploid Number and Sex Chromosome System for the Family Hersiliidae from the Mediterranean Region of Turkey

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.

Characterization of Seminiferous Epithelium Stages in the Wild Javan Muntjac (Muntiacus muntjak muntjak) Using the Tubular Morphology Method

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.

Ovarian histology and fecundity in the evaluation of the reproduction of the invasive species Serrasalmus marginatus (Characidae) on a neotropical floodplain/Histologia ovariana e fecundidade na avaliacao da reproducao da especie invasora Serrasalmus marginatus (Characidae) em uma planicie de inundacao neotropical

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].

Physiological Roles of DNA Double-Strand Breaks

Primary spermatocytes, stained with the anti-SCP3 antibody, were selected to evaluate the respective percentages of leptotene, zygotene, pachytene and diplotene stages.

Ex vivo assessment of testicular toxicity induced by carbendazim and iprodione, alone or in a mixture

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.

A review on medicinal plants used for improvement of spermatogenesis

Early prophasic Leptotene, Oogonia enter into meiosis, stage (CN) zygotene, giving rise to oocytes.

Cellular development of the germinal epithelium during the gametogenic cycle of the golden mussel Limnoperna fortunei (Bivalvia: Mytilidae)