Golden apple snail may give insight on human eye regeneration

    Researchers studied the Golden apple snail which has eyes similar to cameras. It has structures like lens, retina and cornea similar to human eyes. These snails are resilient and very invasive in lots of parts of the world. Its regeneration ability is important to research because their eyes are so similar to human eyes. They found that when the snails' eye is removed it takes about a month to fully regenerate. This includes reconnecting to the brain and restoring vision, that part takes a little longer than a few months. 

    The regeneration process happens in phases. Wound healing, which is the first 24 hours, then unspecialized cells migrate, proliferate, and specialize into eye tissues. Over a few weeks the new eyes mature and then become useable. 

      In relation to humans the PAX6 gene, which is crucial for eye development is also essential in these snails, Using CRISPR-Cas9 the PAX6 gene was disabled in snail embryos. When both copies were inactive snails developed without eyes to show how important this gene is. 

    These snails are important to study and do research on because they share key genes with humans. They could be used as a model organism to study eye regeneration. The next steps in research they're taking are to test whether PAX6 also plays a role in regenerating the eye not just in the eye's initial development. The goal is to map out the snail's regeneration program then relates it to human eyes to see if regeneration is at all possible.

    Sources: 

Saey, T. H. (2025, August 6). This snail may hold a secret to human eye regeneration. Science News. https://www.sciencenews.org/article/snail-human-eye-regeneration

This Snail’s Eyes Grow Back: Could They Help Humans do the Same? (2025, August 14). UC Davis. https://www.ucdavis.edu/news/snails-eyes-grow-back-could-they-help-humans-do-same

  

Restoring Vision Loss Caused by Leber Congenital Amaurosis Using Gene Therapy

     The article begins by explaining a unique cause of vision loss in both adults and children. A rare inherited condition called Leber Congenital Amaurosis, more specifically LCA1, is the result of a mutation in the GUCY2D gene. This gene plays a crucial role in producing the proteins that facilitate vision.  LCA1 generally affects people in early childhood. LCA1 affects roughly only 100,000 individuals worldwide. 

    Researchers at the University of Pennsylvania believe they can inject a new unmutated gene into the retinas of adults and children diagnosed with LCA1-- which could improve vision by 100-1,000 times their original vision.  A total of fifteen patients diagnosed with LCA1- twelve children and three adults-- participated in a new study. All subjects had vision equal to or below 20/80 [a normally sighted individual could see an object at eighty feet, whereas these individuals could only see that same object at twenty feet.] 

    A newly developed form of gene therapy called ATSN-101, developed by Atsena Therapeutics, was performed under a phase two trial designed to gauge the treatment's safety and dosages. Hence, the injected therapy was examined under three varying dosages. Three adults received low and medium dosages of ATN-101, once the lower doses were cleared and assessed, three children and three adults received a high dosage of ATN-101. The patients were tested on their ability to navigate through a dimly lit pathway, read eye charts, undergo "light flash" tests performed in dark environments, and other eye performance exams to assess the results.  The end result was an improvement in vision nearly immediately, usually, within a month, improvements were seen, and treatments lasted around a year. Two out of the nine patients' sight improved by 10,000-fold compared to their sight prior to treatments. Any side effects observed using the therapy were generally related to the surgery itself that was used to implant the gene therapy; such as temporary acute hemorrhages in the eye and or temporary eye inflammation. 

I found this article interesting as I had never heard of the condition Leber Congenital Amaurosis or knew what caused this disease; a mutation in a specific gene called LCA1.  This article piqued my interest from the beginning, and after skimming it, I grew more interested in the topic.  I found it particularly interesting when the authors mentioned that a team of researchers had prior success applying gene therapy to correct another form of Leber Congenital Amaurosis caused by a mutation in another gene referred to as CEP290.  Overall, I found the research in this article both enlightening and hopeful, not only as a viable treatment for individuals with this condition but as a reaffirming promise for the field of gene therapy in treating other conditions/diseases in medicine. 

New Look on Life

     A research team from the University of Houston College of Optometry has designed a new strategy for prescribing glasses to individuals with Down syndrome. This strategy involves a newly constructed computer simulation program that fully examines the eyes of the individual. With this extensive examination, the individual's glasses can maximize their ability to see. In order for the strategy to be developed, the researchers needed to identify some of the physical defects Down syndrome does to the eyes. Also, the researchers needed to identify the genes responsible for causing these defects, especially the ones that contribute to eye development and function. The optical defects include "poor focusing abilities, misalignment of the eyes, and reduced visual acuity". Because of these effects, along with the intellectual disabilities, determining an accurate perscription is difficult. The researchers understand this difficulty, which is why they designed the new computer simulation. Their hope is to implement the system and distribute it across the country. In the future, the researchers hope this system will help patients with Down syndrome see better; thus, making them more independent. The new independence will allow these patients to live happier lives as well as make Down syndrome a little easier to live with.
     It is my hope that this system, or something like it, becomes a huge success. I know that people who suffer from Down syndrome do not like to feel dependent on others. With these new glasses, patients can have a sense of independence, and they can begin to live their lives on their own terms. I wish more research was done in this population of people to help them live more fulfilling lives.

Original Article

Learn More About Down Syndrome

New Genetic Test can speed up diagnosis

There are over 200,000 children worldwide that are diagnosed with congenital cataracts every year and with a new blood test emerging December of this year the diagnoses of their illness and the treatment will come much faster than before. In conventional screenings for congenital cataracts the test would screen every gene individually to pinpoint the exact cause of the illness. This conventional screening though effective, is very costly and time consuming because there are over 100 genes with mutations that cause congenital cataracts and it takes 4 weeks just to screen and examine one gene. So sometimes children and their parents would have to wait years in order to receive a diagnosis and treatment plans, but the new genetic blood test can speed up the diagnosis process. With genetic sequencing doctors can look at all the genes at once in parallel with each other which makes the new test cost effective and time friendly. 

Though doctors aren't exactly positive on what the causes are for congenital cataracts in children, they believe that half is due to a genetic mutation and the other half is due to environmental factors that took place during pregnancy. It is also said that cataracts are not a standalone problem but a more complex one that shows its self with other symptoms and diseases such as Warburg Micro syndrome and galactokinase deficiency. These symptoms and diseases often go under diagnosed  because they are subtle in children, but with genetic sequencing and more tests to be conducted each day. Doctors become more knowledgeable on what causes congenital cataracts, how the will grow and progress,what type of treatments patients will undergo and the outcome of those procedures.

Barbuti,Allison. "Genetic Testing Speeds Up Diagnosis for Children with Congenital Cataracts."  http://www.manchester.ac.uk/aboutus/news/display/?id=10662. 16 Sept. 2013. Web. 22 Sept. 2013.   

 I chose this article because I thought it was very interesting and surprising. I didn't realize that there were so many children affected with cataracts each year, nor did I know what types of tests doctors have used in order to diagnose their patients. I find it pretty amazing that with new technology, children are getting the help they need much faster and for a slightly reduced amount of money.