Familial hypertriglyceridemia/polygenic hypertrigliceridemia

When Blood Is Thicker Than Water: A Case of Acute Pancreatitis Secondary to Familial Hypertriglyceridemia

Hypertriglyceridemia is one of the major causes of acute pancreatitis in addition to gallstones and alcohol use. These etiologies are often associated with underlying comorbidities. Acute pancreatitis secondary to hypertriglyceridemia is associated with an increase in clinical severity and further complications. We present a case of a 56-year-old man with a past medical history of hypertension, diabetes mellitus, and familial hypertriglyceridemia who was diagnosed with acute pancreatitis secondary to hypertriglyceridemia. The patient presented with 9/10 pressure across the abdomen radiating to the sternum. Labs revealed elevated triglyceride count > 8000 mg/dL and cholesterol > 705 mg/dL. Abdominal CT showed fat stranding along the anterior aspect of the pancreatic head. The patient was managed with IV fluids, nil per os (NPO), and statin management for hypertriglyceridemia. Seven days later, triglycerides decreased to 658 mg/dL, and abdominal pain resolved. This case highlights an unusual presentation of acute pancreatitis and demonstrates the importance of understanding the spectrum of etiologies for this condition.

The Genetic Spectrum of Familial Hypertriglyceridemia in Oman

Familial hypertriglyceridemia (F-HTG) is an autosomal disorder that causes severe elevation of serum triglyceride levels. It is caused by genetic alterations in LPL, APOC2, APOA5, LMF1, and GPIHBP1 genes. The mutation spectrum of F-HTG in Arabic populations is limited. Here, we report the genetic spectrum of six families of F-HTG of Arab ancestry in Oman. Methods: six Omani families affected with triglyceride levels >11.2 mmol/L were included in this study. Ampli-Seq sequencing of the selected gene panels was performed. Whole-exome sequencing and copy number variant analysis were also performed in cases with negative exome results. Three novel pathogenic missense variants in the LPL gene were identified, p.M328T, p.H229L, and p.S286G, along with a novel splice variant c.1322+15T > G. The LPL p.H229L variant existed in double heterozygous mutation with the APOA5 gene p.V153M variant. One family had a homozygous mutation in the LMF1 gene (c.G107A; p.G36D) and a heterozygous mutation in the LPL gene (c.G106A; p.D36N). All affected subjects did not have a serum deficiency of LPL protein. Genetic analysis in one family did not show any pathogenic variants even after whole-exome sequencing. These novel LPL and APOA5 mutations are not reported in other ethnic groups. This suggests that patients with F-HTG in Oman have a founder effect and are genetically unique. This warrants further analysis of patients of F-HTG in the Middle East for preventative and counseling purposes to limit the spread of the disease in a population of high consanguinity.