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Alternative RNA Splicing02:18

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
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Making extra teeth: Lessons from a TRPS1 mutation.

Worawan Kunotai1, Panjit Ananpornruedee1, Mark Lubinsky2

  • 1Department of Oral and Maxillofacial Surgery, Chonburi Hospital, Chonburi, Thailand.

American Journal of Medical Genetics. Part A
|October 6, 2016
PubMed
Summary

A novel mutation in the TRPS1 gene was identified in a Thai family with tricho-rhino-phalangeal syndrome type I, leading to supernumerary teeth in the daughters. This finding sheds light on the genetic pathways involved in tooth formation.

Keywords:
Langer-Giedion syndromeWnt signalingexostosisextra teethsupernumerary teethtricho-rhino-phalangeal syndrome

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Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
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Area of Science:

  • Genetics
  • Developmental Biology
  • Oral Medicine

Background:

  • Tricho-rhino-phalangeal syndrome type I (TRPS I) is a rare genetic disorder.
  • Supernumerary teeth, or extra teeth, can occur in individuals with TRPS I.
  • The genetic basis and developmental pathways of supernumerary teeth are not fully understood.

Observation:

  • A Thai mother and her two daughters presented with features of TRPS I.
  • The daughters exhibited significant supernumerary teeth (15 and 18), while the mother had normal dentition.
  • Genetic analysis revealed a novel heterozygous mutation (c.3809_3811delACTinsCATGTTGTG) in the TRPS1 gene in all affected individuals.

Findings:

  • The identified TRPS1 mutation is predicted to alter the protein's Ikaros-like zinc finger domain, impacting its repressive function.
  • Literature review suggests that supernumerary tooth formation involves key genes like APC and RUNX2.
  • The Wnt signaling pathway appears to be a crucial final mediator in the development of supernumerary teeth.

Implications:

  • This study identifies a novel TRPS1 mutation associated with supernumerary teeth in TRPS I.
  • It highlights the complex genetic interactions, including APC, RUNX2, and Wnt signaling, in tooth development.
  • Understanding these pathways may inform future diagnostic and therapeutic strategies for dental anomalies.