Ultrastructure of Gene Transcription in Spermatocytes of Trichosia pubescens Morgante, 1969 (Diptera: Sciaridae)

Abstract In spread preparations of whole spermatocytes of Trichosia pubescens the ribosomal transcription units could be identified by virtue of their “Christmas-tree-like” morphology. The ultrastructural features of these matrices are similar to those described in other eucaryotes. However, in contrast to the previously described systems the “spacer” unit between these matrix units is very small or non-existent at all. In addition, axial fibers displaying much longer lateral fibrils, irregularly spaced, and not as closely packed as in the ribosomal cistrons, were found. These are likely to represent active nonribosomal transcription. In a few instances these lateral fibrils show a gradual increase in their length.

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Activator protein-1 is necessary for angiotensin-II stimulation of human adrenocorticotropin receptor gene transcription

European Journal of Biochemistry ◽

10.1046/j.1432-1033.2001.02055.x ◽

2001 ◽

Vol 268 (6) ◽

pp. 1802-1810

Author(s):

Danielle Naville ◽

Estelle Bordet ◽

Marie-Claude Berthelon ◽

Philippe Durand ◽

Martine Begeot

Keyword(s):

Angiotensin Ii ◽

Gene Transcription ◽

Receptor Gene ◽

Activator Protein 1 ◽

Activator Protein ◽

Stimulation Of

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Regulation of neuronal cholecystokinin gene transcription

CrossRef Listing of Deleted DOIs ◽

10.1080/003655101317095437 ◽

2001 ◽

Vol 61 (7) ◽

pp. 61-67 ◽

Cited By ~ 9

Author(s):

Thomas V. O. Hansen ◽

Finn C. Nielsen

Keyword(s):

Gene Transcription

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Trimming the Christmas Tree or Lighting Menorah Candles Together May Strengthen Your Marriage

PsycEXTRA Dataset ◽

10.1037/e307032004-001 ◽

2001 ◽

Author(s):

Keyword(s):

Christmas Tree

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Q-mediated late gene transcription of bacteriophage λ: RNA start point and RNase III processing sites in vivo

Virology ◽

10.1016/s0042-6822(88)90119-5 ◽

1988 ◽

Vol 167 (2) ◽

pp. 568-577 ◽

Cited By ~ 1

Author(s):

D DANIELS ◽

M SUBBARAO ◽

F BLATTNER ◽

H LOZERON

Keyword(s):

Gene Transcription ◽

Late Gene ◽

Bacteriophage Λ ◽

Rnase Iii

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Lithium increases cAMP responsive element (CRE)/CRE binding protein directed gene transcription in vitro by enhancing transactivation of transcription

Experimental and Clinical Endocrinology & Diabetes ◽

10.1055/s-2004-819108 ◽

2004 ◽

Vol 112 (S 1) ◽

Author(s):

U Böer ◽

J Eglins ◽

W Knepel

Keyword(s):

Gene Transcription ◽

Binding Protein ◽

Transcription In Vitro ◽

Responsive Element

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GENE ACTIVATION IN MAMMARY CELLS

Acta Endocrinologica ◽

10.1530/acta.0.071s346 ◽

1972 ◽

Vol 71 (2_Suppla) ◽

pp. S346-S368 ◽

Cited By ~ 4

Author(s):

Roger W. Turkington ◽

Nobuyuki Kadohama

Keyword(s):

Cell Differentiation ◽

Gene Transcription ◽

Hormonal Regulation ◽

Gene Activation ◽

Milk Proteins ◽

Mouse Mammary Gland ◽

Nuclear Proteins ◽

Mammary Cells ◽

Alveolar Cells ◽

Mammary Cell

ABSTRACT Hormonal activation of gene transcription has been studied in a model system, the mouse mammary gland in organ culture. Transcriptive activity is stimulated in mammary stem cells by insulin, and in mammary alveolar cells by prolactin and insulin. Studies on the template requirement for expression of the genes for milk proteins demonstrate that DNA methylation has an obligatory dependence upon DNA synthesis, but is otherwise independent from hormonal regulation of mammary cell differentiation. Incorporation of 5-bromo-2′deoxyuridine into DNA selectively inhibits expression of the genes for specific milk proteins. Undifferentiated mammary cells activate the synthesis of specific acidic nuclear proteins when stimulated by insulin. Several of these induced acidic nuclear proteins are undetectable in unstimulated undifferentiated cells, but appear to be characteristic components of the nuclei of differentiated cells. These results indicate that mammary cell differentiation is associated with a change in acidic nuclear proteins, and they provide evidence to support the concept that acidic nuclear proteins may be involved in the regulation of gene transcription and of mammary cell differentiation.

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INFLUENCE OF METYRAPONE ON PLASMA CONCENTRATIONS OF TESTOSTERONE AND ANDROSTENEDIONE IN MAN

Acta Endocrinologica ◽

10.1530/acta.0.0680576 ◽

1971 ◽

Vol 68 (3) ◽

pp. 576-584 ◽

Cited By ~ 5

Author(s):

K. O. Nilsson ◽

B. Hökfelt

Keyword(s):

Body Weight ◽

Male Patient ◽

Gradual Increase ◽

Plasma Concentrations ◽

Plasma Testosterone ◽

Testosterone Levels ◽

Basal Plasma ◽

Normal Males ◽

A Minor ◽

Secondary Hypogonadism

ABSTRACT Metyrapone was administered either orally, 750 mg every four h, in a total of six doses, or intravenously 30 mg per kg body weight as a four h infusion. In three males with normal endocrine functions, metyrapone given orally or intravenously induced a fall in plasma testosterone and an elevation of androstenedione within 2–8 h. When metyrapone was administered to a patient given dexamethasone to suppress endogenous ACTH production, the androstenedione levels did not alter whereas the testosterone levels showed a slight, transient decrease. In two normal females metyrapone administration was followed by a marked increase in plasma androstenedione whereas testosterone showed only a minor, gradual increase. In one male patient with Addison's disease the basal plasma testosterone was normal whereas the level of androstenedione was low. Following metyrapone intravenously, there was a slight suppression of plasma testosterone but no change in the androstenedione concentration. In one patient with primary hypogonadism, two with secondary hypogonadism and two with Klinefelter's syndrome the plasma testosterone was low under basal conditions and did not change following metyrapone. Basal plasma androstenedione was within the range for normal males and increased markedly following metyrapone in all the cases.

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