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Characterization of porcine dentin sialoprotein (DSP) and dentin sialophosphoprotein (DSPP) cDNA clones
Author(s) -
Yamakoshi Yasuo,
Hu Jan C.C.,
Liu Shengxi,
Zhang Chuhua,
Oida Shinichiro,
Fukae Makoto,
Simmer James P.
Publication year - 2003
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1034/j.1600-0722.2003.00009.x
Subject(s) - dentin sialophosphoprotein , complementary dna , coding region , microbiology and biotechnology , polyadenylation , biology , open reading frame , genetics , gene , messenger rna , peptide sequence , biochemistry , alkaline phosphatase , enzyme
Dentin sialophosphoprotein (DSPP) is a chimeric glycoprotein with dentin sialoprotein (DSP) on its N ‐terminus and dentin phosphoprotein (DPP) on its C ‐terminus. We have constructed and screened a unidirectional cDNA library derived from the pulp organ of developing pig teeth, and isolated cDNA clones encoding DSP‐only, as well as two DSPP clones with alternative sequences in their 3′ coding regions. The DSP‐only transcript has an open reading frame of 386 codons, and is generated through the use of a polyadenylation signal within intron 4, immediately following the DSP coding region. the use of this polyadenylation signal deletes the DPP coding region and places a TGA translation termination signal as the fourth codon following the exon 4‐encoded segment. The DSPP cDNAs contain open reading frames of 593 and 600 codons. Northern blots hybridized to radiolabeled DSP probes showed bands at 1.4, 2.5, 4.4, and 4.8 kb. Cloning and characterization of reverse transcriptase polymerase chain reaction products confirmed the existence of mRNA encoding pDSP 386 , pDSPP 593 , and pDSPP 600 in vivo , but also suggested that DNA sequence redundancies in the DSPP coding region make it prone to cloning artifacts.