Our purpose was to evaluate inherited short tandem repeat polymorphisms of the insulin-like growth factor II receptor gene (IGF2R) in oral cancer risk. The 197 individuals that consented to participate in a hospital-based, case-control study were interviewed with a structured questionnaire and provided blood and saliva. DNA was extracted for genotyping using a PCR-based method. Odds ratios were...

Imprinted gene identification in animals has been limited to eutherian mammals, suggesting a significant role for intrauterine fetal development in the evolution of imprinting. We report herein that M6P/IGF2R is not imprinted in monotremes and does not encode for a receptor that binds IGF2. In contrast, M6P/IGF2R is imprinted in a didelphid marsupial, the opossum, but it strikingly lacks the di...

The insulin-like growth factor type 2 receptor, also known as the cation independent mannose-6-phosphate receptor (Igf2r) is an imprinted gene, which is repressed on the paternally inherited allele in midgestation mouse embryos. We have used a LacZ reporter gene, targeted into the endogenous gene, to investigate the developmental timing, tissue specificity and stability of the repression of the...

In mice, only the paternal allele of the Igf2 gene, encoding insulin-like growth factor II (IGF-II) is expressed due to parental imprinting. Interestingly, the Igf2r gene, which encodes one of the two known receptors (IGF2R) to which IGF-II binds with high affinity is also subject to imprinting, but in a reciprocal fashion. This observation raises the possibility that imprinting of these loci s...

Imprinted maternal-allele-specific expression of the mouse insulin-like growth-factor type 2 receptor (Igf2r) gene depends on a 3.7-kb element named region 2, located in the second intron of the gene. Region 2 carries a maternal-allele-specific methylation imprint and contains an imprinted CpG island promoter (Air) that expresses a noncoding antisense RNA from the paternal inherited allele only...

A CpG island (CGI) lies at the 5' end of the Airn macro non-protein-coding (nc) RNA that represses the flanking Igf2r promoter in cis on paternally inherited chromosomes. In addition to being modified on maternally inherited chromosomes by a DNA methylation imprint, the Airn CGI shows two unusual organization features: its position immediately downstream of the Airn promoter and transcription s...

Cell surface mannose 6-phosphate/insulin-like growth factor II receptors (M6P/IGF2R) bind and target exogenous insulin-like growth factor II (IGF2) to the prelysosomes where it is degraded. Loss of heterozygosity (LOH) for M6P/IGF2R is found in cancers, with mutational inactivation of the remaining allele. We exploited the normal allele-specific differential methylation of the M6P/IGF2R intron ...

The aim of this study is to investigate the relationship between single nucleotide polymorphisms (SNPs) and susceptibility to obesity. A previous study suggested that insulin-like growth factors (IGFs) may affect obesity and that IGFs regulate cellular signals by receptors that include the insulin-like growth factor 1 receptor (IGF1R) and the insulin-like growth factor 2 receptor (IGF2R). In th...

Cattle genetically selected for twin ovulations and births (Twinner) exhibit increased ovarian follicular development, increased ovulation rate, and greater blood and follicular fl uid IGF-1 concentrations compared with contemporary cattle not selected for twins (Control). Experimental objectives were to 1) assess relationships among aromatase (CYP19A1), IGF-1 (IGF1), IGF-2 receptor (IGF2R), an...