leptotene


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leptotene

 [lep´to-tēn]
the stage of meiosis in which the chromosomes are threadlike in shape.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lep·to·tene

(lep'tō-tēn),
Early stage of prophase in meiosis in which the chromosomes contract and become visible as long filaments well separated from each other.
Synonym(s): leptonema
[lepto- + G. tainia, band, tape]
Farlex Partner Medical Dictionary © Farlex 2012

lep·to·tene

(lep'tō-tēn)
Early stage of prophase in meiosis in which the chromosomes contract and become visible as long filaments well separated from each other.
[lepto- + G. tainia, band, tape]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

leptotene

the first stage of PROPHASE 1 of MEIOSIS in which each chromosome resembles a thin thread as it emerges from INTERPHASE. The chromosomes have divided into CHROMATIDS but these are not usually visible at this stage.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
4: Effects of CBZ, IPR and CCK on the chronology of meiosis Primary spermatocytes stained with an anti-SCP3 antibody were selected to evaluate the respective percentages of leptotene, zygotene, pachytene and diplotene stages of the meiotic prophase.
With SCP3, which visualizes the axial elements and the lateral elements of the SC, we evaluated the respective frequencies of the three leptotene, zygotene and pachytene stages in patients and controls, and assessed the frequencies of the main types of meiotic abnormalities observed at the pachytene stage.
Microscope analysis: Nuclei of the first meiotic prophase at leptotene, zygotene and pachytene stages were analyzed using a Zeiss Axioskop epifluorescent photomicroscope equipped with propidium iodide, fluorescein isothiocyanate, and 4,6-diamidino-2-phenyllindole filters (Carl Zeiss, MC80, Oberkochen, Germany) equipped with an epifluorescent system.
Statistical analysis: Mann-Withney test was used in order to evaluate the frequencies of leptotene, zygotene, and pachytene stages, and the staging of pachytene cells in controls and patients.
Respective frequencies of leptotene, zygotene and pachytene stages: In the controls, the frequency of leptotene stage (Fig.1A-B) varied from 1 to 4.50 per cent with a mean of 2.30 per cent, the frequency of zygotene stage (Fig.1C) varied from 0.50 to 2.50 per cent with a mean of 1.45 per cent, while the frequency of pachytene stage (Fig.
In patients, the frequency of leptotene stages varied from 2 to 11.50 per cent with a mean of 7.95 per cent, the frequency of zygotene stages varied from 3.50 to 23 per cent with a mean of 9.75 per cent, and the frequency of pachytene stages varied from 57 to 92.50 per cent with a mean of 75.30 per cent (Table II).
In meiosis the process is divided into six stages: preleptotene, leptotene, zygotene, pachytene, diplotene, and diakinesis.
The chromatin appears as a very dense cluster in the leptotene spermatocyte.