Tay-Sachs Disease

It is a hereditary disorder where the congenital absence of the Hex-A enzyme, which is responsible for breaking down waste fat molecules (GM2 gangliosides) in the body, allows these toxic lipids to accumulate in brain cells, systematically destroying the central nervous system.

It is transmitted via an autosomal recessive pattern. For a child to be born with the disease, both the mother and the father must carry and pass down this silent genetic mutation to their offspring.

At birth, the infant appears completely healthy. Between 3 and 6 months of age, neurodevelopment stalls. The baby loses previously acquired milestones such as rolling over, sitting, or smiling. A pathognomonic symptom is an exaggerated, abnormal startle reflex in response to sudden loud noises.

This is the most typical diagnostic sign of the disease. When an ophthalmologist performs a fundoscopic examination, they observe a bright red spot (cherry-red spot) directly in the center of the macula, which contrasts sharply against the surrounding retinal pallor caused by lipid accumulation.

Following the clinical eye examination, diagnosis is confirmed through a blood test demonstrating absent or near-zero levels of the Hexosaminidase-A (Hex-A) enzyme in the serum or white blood cells, alongside specific molecular Genetic testing.

No, unfortunately, there is no definitive cure. The disease progresses very rapidly, leading to severe seizures (epilepsy), blindness, paralysis, and loss of the ability to swallow. The majority of affected infants succumb to severe respiratory infections before reaching 4 to 5 years of age. Treatment is strictly palliative, aimed solely at keeping the child comfortable.