biology

Lipoprotein lipase deficiency

Lipoprotein lipase deficiency is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lipoprotein lipase deficiency rather than just read about it. In short: Lipoprotein lipase deficiency is a genetic disorder in which a person has a defective gene for lipoprotein lipase, which leads to very high triglycerides, which in turn causes stomach pain and deposits of fat under the skin, and which can lead to problems with the pancreas and liver, which in turn can lead to diabetes. The disorder occurs only if a child inherits the defective gene from both parents (it is autosomal…

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Reference excerpt

Lipoprotein lipase deficiency is a genetic disorder in which a person has a defective gene for lipoprotein lipase, which leads to very high triglycerides, which in turn causes stomach pain and deposits of fat under the skin, and which can lead to problems with the pancreas and liver, which in turn can lead to diabetes. The disorder occurs only if a child inherits the defective gene from both parents (it is autosomal recessive). It is managed by restricting fat in the diet to less than 20 g/day.

Signs and symptoms The disease often presents in infancy with colicky pain, failure to thrive, and other symptoms and signs of the chylomicronemia syndrome. In women, the use of estrogens or first pregnancy are also well known trigger factors for initial manifestation of LPLD. At all ages, the most common clinical manifestation is recurrent abdominal pain and acute pancreatitis. The pain may be epigastric, with radiation to the back, or it may be diffuse, with the appearance of an emergent acute abdomen. Other typical symptoms are eruptive xanthomas (in about 50% of patients), lipaemia retinalis, and hepatosplenomegaly.

Complications Patients with LPLD are at high risk of acute pancreatitis, which can be life-threatening and can lead to chronic pancreatic insufficiency and diabetes.

Diagnosis Lab tests show massive accumulation of chylomicrons in the plasma and corresponding severe hypertriglyceridemia. Typically, the plasma in a fasting blood sample appears creamy (plasma lactescence). Familial LPL deficiency should be considered in anyone with severe hypertriglyceridemia and the chylomicronemia syndrome. The absence of secondary causes of severe hypertriglyceridemia (e.g., diabetes, alcohol, estrogen-, glucocorticoid-, antidepressant-, or isotretinoin-therapy, certain antihypertensive agents, and paraproteinemic disorders) increases the possibility of LPL deficiency. In this instance, besides LPL, other loss-of-function mutations in genes that regulate catabolism of triglyceride-rich lipoproteins (e.g., ApoC2, ApoA5, LMF-1, GPIHBP-1, GPD1) should also be considered. The diagnosis of familial lipoprotein lipase deficiency is finally confirmed by the detection of either homozygous or compound heterozygous pathogenic gene variants in LPL with either low or absent lipoprotein lipase enzyme activity. Lipid measurements · Milky, lipemic plasma revealing severe hyperchylomicronemia; · Severely elevated fasting plasma triglycerides (>2000 mg/dL); LPL enzyme · Low or absent LPL activity in post-heparin plasma; · LPL mass level reduced or absent in post-heparin plasma; Molecular genetic testing The LPL gene is located on the short (p) arm of chromosome 8 at position 22. More than 220 mutations in the LPL gene have been found to cause familial lipoprotein lipase deficiency so far.

Treatment Treatment of LPLD has two different objectives: immediate prevention of pancreatitis attacks and long-term reduction of cardiovascular disease risk. Olezarsen (Tryngolza) was approved for medical use in the United States in December 2024.

Gene therapy In 2012, the European Commission approved alipogene tiparvovec (Glybera), a gene therapy for adults with familial LPLD (confirmed by genetic testing) and having severe or multiple pancreatitis attacks despite dietary fat restrictions. It is the first gene therapy to receive marketing authorization in the European Union; it was priced at about $1 million per treatment, and as of 2016, only one person had been treated with it commercially. A total of 31 people were treated with Glybera, most for free in clinical trials before it was taken off the market.

Incidence The disorder affects about 1 out of 1,000,000 people; however, epidemiological data are limited, and there are regional differences due to founder effect (e.g., in Canada) or intermarriage.

See also Primary hyperlipoproteinemia Familial apoprotein CII deficiency List of cutaneous conditions

References

Further reading Gaudet, D; de Wal, J; Tremblay, K; Déry, S; van Deventer, S; Freidig, A; Brisson, D; Méthot, J (June 2010). "Review of the clinical development of alipogene tiparvovec gene therapy for lipoprotein lipase deficiency". Atherosclerosis. Supplements. 11 (1): 55–60. doi:10.1016/j.atherosclerosissup.2010.03.004. PMID 20427244. "LPL gene". NIH Genetics Home Reference. February 2015. Hegele, RA; et al. (August 2014). "The polygenic nature of hypertriglyceridaemia: implications for definition, diagnosis, and management". The Lancet. Diabetes & Endocrinology. 2 (8): 655–66. doi:10.1016/S2213-8587(13)70191-8. PMC 4201123. PMID 24731657.

External links

Illustrations

Worked examples

Example 1 — a first encounter with Lipoprotein lipase deficiency

Start with the simplest possible case. Write down what Lipoprotein lipase deficiency claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lipoprotein lipase deficiency before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lipoprotein lipase deficiency ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lipoprotein lipase deficiency

In research: Lipoprotein lipase deficiency appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lipoprotein lipase deficiency in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lipoprotein lipase deficiency is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lipid metabolism disorders, Rare diseases, Skin conditions resulting from errors in metabolism, so understanding it makes those chapters shorter.
In everyday life: Look for Lipoprotein lipase deficiency outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lipoprotein lipase deficiency in 20 minutes

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Frequently asked questions

What is Lipoprotein lipase deficiency in simple terms?

Why does Lipoprotein lipase deficiency matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lipoprotein lipase deficiency?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lipoprotein lipase deficiency.