Constitutive Heterochromatin and Nucleolus Organizer Regions in Japanese Brown Frogs, <i>Rana japonica</i> and <i>Rana ornativentris</i>

Occurrence of multiple nucleolus organizer regions and intraspecific karyotype variation in Scaptotrigona xanthotricha Moure (Hymenoptera, Meliponini).

Scaptotrigona xanthotricha has a wide geographic distribution in the Brazilian Atlantic rainforest. One population from southeast and two from northeast Brazil were analyzed and were found to have chromosome polymorphisms. Although the chromosome number 2n = 34 is conserved in this species, karyotypic analysis revealed clear differences between the three populations. Congruent and ubiquitous mu...

Ribosomal Rna in the Nucleolus Organizer

the possible association between constitutive heterochromatin polymorphism and human leukemias

objective: polymorphism of the size of heterochromatin region of chromosomes has been well documented in human genome and it consists of dna sequences that are not transcribed. the prime aim of the present study was to evaluate the heterochromatin polymorphism associated with chromosomes in leukemic patients. materials and methods: the study was conducted on 35 consecutive leukemic patients and...

Nuclear Architecture of Mouse Spermatocytes: Chromosome Topology, Heterochromatin, and Nucleolus.

The nuclear organization of spermatocytes in meiotic prophase I is primarily determined by the synaptic organization of the bivalents that are bound by their telomeres to the nuclear envelope and described as arc-shaped trajectories through the 3D nuclear space. However, over this basic meiotic organization, a spermatocyte nuclear architecture arises that is based on higher-ordered patterns of ...

Activation of Epidermal Growth Factor Receptor (pEGFR) and Expression of Argentophilic Nucleolus Organizer Regions (AgNOR) in Seminomas

Activation of epidermal growth factor receptor (p-EGFR) is one of the triggers in the development of many malignant tumors, and the measurement of Argentophilic Nucleolus Organizer Regions (AgNOR) area is used as a marker of tumor proliferation. Alpha actin smooth muscle (αASM) of Original Research Article Guerra et al.; BJMMR, 13(9): 1-9, 2016; Article no.BJMMR.23933 2 peritubular cells (PT) a...