Mutations in LMF1 cause combined lipase deficiency and severe hypertriglyceridemia.

Abstract:

:Hypertriglyceridemia is a hallmark of many disorders, including metabolic syndrome, diabetes, atherosclerosis and obesity. A well-known cause is the deficiency of lipoprotein lipase (LPL), a key enzyme in plasma triglyceride hydrolysis. Mice carrying the combined lipase deficiency (cld) mutation show severe hypertriglyceridemia owing to a decrease in the activity of LPL and a related enzyme, hepatic lipase (HL), caused by impaired maturation of nascent LPL and hepatic lipase polypeptides in the endoplasmic reticulum (ER). Here we identify the gene containing the cld mutation as Tmem112 and rename it Lmf1 (Lipase maturation factor 1). Lmf1 encodes a transmembrane protein with an evolutionarily conserved domain of unknown function that localizes to the ER. A human subject homozygous for a deleterious mutation in LMF1 also shows combined lipase deficiency with concomitant hypertriglyceridemia and associated disorders. Thus, through its profound effect on lipase activity, LMF1 emerges as an important candidate gene in hypertriglyceridemia.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Péterfy M,Ben-Zeev O,Mao HZ,Weissglas-Volkov D,Aouizerat BE,Pullinger CR,Frost PH,Kane JP,Malloy MJ,Reue K,Pajukanta P,Doolittle MH

doi

10.1038/ng.2007.24

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

1483-7

issue

12

eissn

1061-4036

issn

1546-1718

pii

ng.2007.24

journal_volume

39

pub_type

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