Structure and evolution of the human prosaposin chromosomal gene.

Abstract:

:The gene for prosaposin was characterized by sequence analysis of chromosomal DNA to gain insight into the evolution of this locus that encodes four highly conserved sphingolipid activator proteins or saposins. The 13 exons ranged in size from 57 to 1200 bp, while the introns were from 91 to 3812 bp in length. The regions encoding saposins A, B, and D each had three exons, while that for saposin C had only two. This sequence included the regions that encode the carboxy terminus of the signal peptide, the four mature prosaposin proteins, and the 3' untranslated region. Primer extension studies indicated that over 99% of the coding sequence was contained in these 19,985 bp. Use of PCR and reverse PCR techniques indicated that the most 5' coding approximately 140 bp contained large introns and at least two small exons. Analyses of the intronic positions in the saposin regions indicated that this gene evolved from an ancestral gene by two duplication events and at least one gene rearrangement involving a double crossover after introns had been inserted into the gene.

journal_name

Genomics

journal_title

Genomics

authors

Rorman EG,Scheinker V,Grabowski GA

doi

10.1016/0888-7543(92)90247-p

subject

Has Abstract

pub_date

1992-06-01 00:00:00

pages

312-8

issue

2

eissn

0888-7543

issn

1089-8646

pii

0888-7543(92)90247-P

journal_volume

13

pub_type

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