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Related Experiment Videos

Cloning, characterization, and tissue expression pattern of mouse tuftelin cDNA

M MacDougall1, D Simmons, A Dodds

  • 1University of Texas Health Science Center at San Antonio, School of Dentistry, Department of Pediatric Dentistry, 78284-7888, USA.

Journal of Dental Research
|December 5, 1998
PubMed
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Tuftelin protein research clarifies its amino acid sequence and expression. This enamel protein is found in multiple tissues, not just ameloblasts, with variations in mRNA detected.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Tuftelin is a protein implicated in enamel crystal nucleation.
  • Previous studies on bovine tuftelin cDNA and genomic clones presented conflicting reading frames, affecting the derived amino acid sequence.

Purpose of the Study:

  • To isolate and characterize full-length mouse and partial porcine tuftelin cDNA clones.
  • To resolve discrepancies in the bovine tuftelin amino acid sequence and investigate its expression patterns.

Main Methods:

  • Isolation and characterization of full-length mouse and partial porcine tuftelin cDNA clones.
  • Sequence comparison across bovine, mouse, and porcine species.
  • Northern blot analysis and RT-PCR for gene expression studies.

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Main Results:

  • A 2572-nucleotide mouse tuftelin cDNA clone was characterized, predicting a 390-amino acid protein.
  • Sequence comparisons supported a revised bovine tuftelin sequence and suggested re-assignment of the translation initiation codon.
  • Tuftelin is expressed in multiple tissues (kidney, lung, liver, testis) with two RNA messages (2.6 and 3.2 kb); alternative splicing was identified in kidney tuftelin mRNA.

Conclusions:

  • The study clarifies the tuftelin protein sequence, resolving frame-shift ambiguities.
  • Tuftelin expression is not limited to ameloblasts, indicating broader physiological roles.
  • Identification of alternative splicing suggests complex regulation of tuftelin function.