Genetic variants that are unrelated to the IOP are associated with a family history of glaucoma and play a role in the onset of primary open-angle glaucoma (POAG). Genetic variants that are related to the IOP are associated with the age at which glaucoma is diagnosed and are associated with disease progression.

What is known about POAG, the most prevalent form of glaucoma, is that increased IOP and myopia are risk factors for damage to the optic nerve in POAG.

Related: Stent offers IOP stability more than three years after surgery

A family history of glaucoma is a major risk factor for development of POAG, in light of which, therefore, genetic factors are thought to be important in the disease pathogenesis and a few genes mutations have been identified as causing POAG, according to Fumihiko Mabuchi, MD, PhD, professor, Department of Ophthalmology, Faculty of Medicine, University of Yamanashi, Kofu, Japan.

Myopia has been shown to be a risk factor for POAG in several studies. However, it can be difficult to diagnose true POAG in myopic patients and controversy exists over whether it is real risk factor.

Myopic optic discs are notoriously difficult to assess, and myopic patients may have visual field defects unrelated to any glaucomatous process.

The prevalence of POAG increases with age, even after compensating for the association between age and IOP.

Related: Preservative-free tafluprost/timolol lowers IOP well, glaucoma study shows

Part of the storyDr. Mabuchi and his and colleagues, recounted that these factors are only part of the story.

According to Dr. Mabuchi and his colleagues, cases of POAG caused by these gene mutations account for several percent of all POAG cases, and most POAG is presumed to be a polygenic disease.

Recent genetic analyses, the investigators explained, have reported genetic variants that predispose patients to development of POAG and the additive effect of these variants on POAG, which are classified as two types.

The first genetics variants are associated with IOP elevation.

Related: Sustained-release implant offers long-term IOP control, preserved visual function

Here is the original post:
Genetic variants linked with onset, progression of POAG - Ophthalmology Times