Journal Article

Cross-species analyses implicate <i>Lipin 1</i> involvement in human glucose metabolism

Elina Suviolahti, Karen Reue, Rita M. Cantor, Jack Phan, Massimiliano Gentile, Jussi Naukkarinen, Aino Soro-Paavonen, Laura Oksanen, Jaakko Kaprio, Aila Rissanen, Veikko Salomaa, Kimmo Kontula, Marja-Riitta Taskinen, Päivi Pajukanta and Leena Peltonen

in Human Molecular Genetics

Volume 15, issue 3, pages 377-386
Published in print February 2006 | ISSN: 0964-6906
Published online December 2005 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddi448
Cross-species analyses implicate Lipin 1 involvement in human glucose metabolism

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Recent studies in the mouse have demonstrated that variations in lipin expression levels in adipose tissue have marked effects on adipose tissue mass and insulin sensitivity. In the mouse, lipin deficiency prevents normal adipose tissue development, resulting in lipodystrophy and insulin resistance, whereas excess lipin levels promote fat accumulation and insulin sensitivity. Here, we investigated the effects of genetic variation in lipin levels on glucose homeostasis across species by analyzing lipin transcript levels in human and mouse adipose tissues. A strong negative correlation was observed between lipin mRNA levels and fasting glucose and insulin levels, as well as an indicator of insulin resistance (HOMA-IR), in both mice and humans. We subsequently analyzed the allelic diversity of the LPIN1 gene in dyslipidemic Finnish families, as well as in a case–control sample of obese (n=477) and lean (n=821) individuals. Alleles were defined by genotyping seven single nucleotide polymorphisms (SNPs) of the critical DNA region over the LPIN1 gene. Intragenic SNPs and corresponding allelic haplotypes exhibited associations with serum insulin levels and body mass index (P=0.002–0.04). Both the expression levels in adipose tissue across species and genetic data in human study samples highlight the importance of lipin in glucose homeostasis and imply that allelic variants of this gene have significance in human metabolic traits.

Journal Article.  5930 words.  Illustrated.

Subjects: Genetics and Genomics

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