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General Transcription Factors

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Transcription Factors

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Transcription Factors

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

TGF - β Signaling Pathway

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...

Pleiotropy

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

mTOR Signaling and Cancer Progression

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...

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Related Experiment Video

Updated: Jul 16, 2026

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

Published on: August 20, 2019

Tob genes in development and homeostasis.

Shunji Jia¹, Anming Meng

¹Protein Science Laboratory of the Ministry of Education, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing, China. jshj00@mail.tsinghua.edu.cn

Developmental Dynamics : an Official Publication of the American Association of Anatomists

|February 17, 2007

Summary

Tob proteins, crucial for cell proliferation inhibition, are key regulators in various biological processes. These proteins play vital roles in reproduction, development, and immune responses, primarily acting as transcriptional repressors.

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Area of Science:

Molecular Biology
Cell Biology
Developmental Biology

Background:

The Btg/Tob protein family is characterized by a conserved N-terminal region responsible for inhibiting cell proliferation.
Tob1 and Tob2 proteins form a subfamily with distinct C-terminal regions compared to BTG proteins.
Gene duplication events have led to Tob1 and Tob2 loci in mammals, birds, and amphibians, contrasting with a single Tob locus in invertebrates and fish.

Purpose of the Study:

To elucidate the diverse roles and mechanisms of Tob proteins across different species and biological contexts.
To highlight the significance of Tob proteins in key physiological and developmental processes.

Main Methods:

Comparative genomics to analyze Tob gene loci distribution across species.
Expression pattern analysis in oocytes, sperm, embryos, and adult tissues.
Literature review of recent findings on Tob protein functions in various biological pathways.

Main Results:

Tob genes are widely expressed, including in reproductive cells, early embryos, and diverse adult tissues.
Tob proteins are implicated in critical processes such as spermatogenesis, embryonic patterning, bone formation, T-cell activation, and cognitive functions.
Emerging evidence suggests Tob proteins function predominantly as transcriptional repressors within multiple signaling pathways.

Conclusions:

Tob proteins are evolutionarily conserved regulators with essential functions spanning from reproduction to complex physiological processes.
The primary mechanism of Tob action involves transcriptional repression, impacting various signaling cascades.
Further research into Tob protein functions can reveal novel therapeutic targets for developmental and degenerative diseases.