What is Familial Partial Lipodystrophy

Familial Partial Lipodystrophy is a rare genetic disorder characterized by the progressive loss of subcutaneous fat from specific areas of the body, such as the limbs and trunk, often accompanied by the redistribution of fat to the face, neck, or abdomen. This condition frequently leads to significant metabolic complications, including severe insulin resistance, diabetes mellitus, and high triglyceride levels.

What are the symptoms and body systems affected by Familial Partial Lipodystrophy?

In Familial Partial Lipodystrophy, the body’s inability to store fat in typical adipose tissue forces it to accumulate in ectopic sites (like the liver or muscles), which disrupts metabolic health. Patients often experience:

• Loss of fat in the arms, legs, and buttocks.


• Excessive fat accumulation in the face, neck, or intra-abdominal region.


• Severe insulin resistance leading to early-onset Type 2 diabetes.


• Hypertriglyceridemia, which increases the risk of pancreatitis.


• Acanthosis nigricans (dark, velvety skin patches in body folds).

How is Familial Partial Lipodystrophy classified and what causes it?

Familial Partial Lipodystrophy is primarily caused by genetic mutations, most commonly in the LMNA gene (Dunnigan variety) or the PPARG gene. These mutations affect the function of adipocytes (fat cells), preventing them from storing energy correctly. While Familial Partial Lipodystrophy is often inherited in an autosomal dominant pattern, the severity of symptoms can vary significantly even among family members.

Who is typically affected by Familial Partial Lipodystrophy?

The prevalence of Familial Partial Lipodystrophy is estimated to be between 1 in 100,000 and 1 in 1,000,000, though it is likely underdiagnosed. Onset typically occurs during puberty, when visible changes in body fat distribution become apparent. While Familial Partial Lipodystrophy affects both genders, women often experience more pronounced metabolic complications and physical changes due to the hormonal influences on fat distribution.

How does it differ from other lipodystrophies?

Unlike generalized lipodystrophy, where fat loss is total, Familial Partial Lipodystrophy is distinguished by its specific, localized pattern of fat loss. Currently, 27 people with Familial Partial Lipodystrophy have joined the DiseaseMaps community to share their lived experiences and navigate the complexities of this rare diagnosis.

Next steps

• Consult an endocrinologist with experience in metabolic or lipid disorders.


• Undergo genetic testing to confirm the specific mutation type.


• Monitor blood glucose and lipid panels regularly to manage metabolic risks.


• Join the DiseaseMaps.org community to connect with others living with this condition.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Familial Partial Lipodystrophy


• Orphanet: Familial Partial Lipodystrophy


• OMIM (Online Mendelian Inheritance in Man): Lipodystrophy, Familial Partial


• Lipodystrophy United: Patient support and education resources