Isolation and expression analysis of the canine insulin-like factor 3 gene.
The insulin-like factor 3 (INSL3 or relaxin-like factor) is a hormone produced mainly in gonadal tissues in males and females. Deletion of INSL3 or its receptor in male mice leads to the undescended testes, or cryptorchidism. Here we describe an isolation and analysis of full-length canine INSL3 gene. The INSL3 gene is composed of two exons within a small genomic region. Putative translation of the isolated cDNA yields 132 amino acid preproINSL3 that has the domain structure characteristic for the insulin-relaxin peptide superfamily with a well-conserved receptor-binding domain. Northern blot hybridization showed stronger expression of INSL3 in testis than in ovary. Reverse transcription-polymerase chain reaction analysis of the INSL3 expression revealed a minor splice variant of INSL3 potentially encoding 105 amino acids peptide. We established that the medium, conditioned with recombinant canine INSL3, produced from the full-length cDNA, but not from the minor splice variant, activated human GREAT/LGR8 receptor in vitro. In addition to the functional allele of INSL3, genomic DNA of one of the analyzed dogs contained an intronless nonexpressed pseudogene of INSL3. We isolated canine INSL3 promoter and showed that its activity was strongly mediated by steroidogenic factor-1 in vitro. Using site-specific mutagenesis, we identified a well-conserved steroidogenic factor-1 binding site within canine INSL3 promoter.
Truong
Anne
A
Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030, USA.
Bogatcheva
Natalia V
NV
Schelling
Claude
C
Dolf
Gaudenz
G
Agoulnik
Alexander I
AI
D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D015139:Blotting, Southern; D004247:DNA / Q000096:biosynthesis / Q000302:isolation & purification; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology; D004285:Dogs; D005091:Exons / Q000235:genetics; D051717:Fushi Tarazu Transcription Factors; D015723:Gene Library; D007328:Insulin; D008969:Molecular Sequence Data; D010802:Phylogeny; D011401:Promoter Regions, Genetic / Q000235:genetics; D011506:Proteins / Q000235:genetics* / Q000502:physiology*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D054339:Steroidogenic Factor 1; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology; D015854:Up-Regulation / Q000502:physiology
D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D051717:Fushi Tarazu Transcription Factors; D007328:Insulin; C084797:Leydig insulin-like protein; C515057:NR5A1 protein, human; D011506:Proteins; D012333:RNA, Messenger; D054339:Steroidogenic Factor 1; D014157:Transcription Factors; D004247:DNA