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Volume 270,
Number 27,
Issue of July 07, pp. 16385-16394, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
Molecular
Cloning, Characterization, and Genetic Mapping of the cDNA Coding for a
Novel Secretory Protein of Mouse
DEMONSTRATION OF ALTERNATIVE SPLICING IN SKIN AND CARTILAGE
Jayant
Bhalerao
,
Przemko
Tylzanowski
,
Jane
D.
Filie
,
Christine A.
Kozak
,
Joseph
Merregaert
A novel 85-kDa protein secreted by the mouse stro-mal osteogenic
cell line MN7 was identified using two-dimensional polyacrylamide gel
electrophoresis (Mathieu, E., Meheus, L., Raymackers, J., and
Merregaert, J.(1994) J. Bone Miner. Res. 9, 903-913).
Degenerate primers were used to isolate the cDNA coding for this
protein. The full-length cDNA clone is 1.9 kilobases (kb) and codes for
a protein of 559 amino acid residues. The DNA and deduced amino acid
sequences have no counterparts in public data bases, but a structural
similarity involving typical cysteine doublets can be observed to serum
albumin family proteins and to Endo16 (a calcium-binding protein of sea
urchin). Northern blot analysis revealed the presence of a 1.9-kb
transcript in various tissues, and a shorter transcript of 1.5 kb,
derived by alternative splicing in tail, front paw and skin of
embryonic mice. The gene for the p85 protein, termed Ecm1 (for
extracellular matrix protein 1), is a single-copy gene, which was
localized to the region on mouse chromosome 3 known to contain at least
one locus associated with developmental disorders of the skin, soft
coat (soc). Alternative splicing may serve as a mechanism for
generating functional diversity in the Ecm1 gene.

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Copyright © 1995 by the American Society for Biochemistry and Molecular Biology.
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