Rare Gene Change Tied to Floppy Baby Syndrome

A baby who looks floppy from the start can catch parents off guard. That soft, limp feeling is often the first sign that something unusual is going on. In some cases, it points to a rare genetic condition called HADDTS. This condition affects how the body grows and develops. Early clues can help doctors look for the right answers sooner. Parents might notice the infant struggles to lift the head or seems unusually relaxed.

The problem is linked to a specific change in a gene named CTBP1. A single DNA letter flips from C to T, which swaps one amino acid for another at position 342. This change makes the protein act in a dominant negative way, meaning it interferes with the healthy version. People with this mutation may have low muscle tone, trouble balancing, and delayed speech. Facial features can look different, tooth enamel may be weak, and many deal with ongoing constipation. Brain scans often reveal cerebellar atrophy, a part of the brain that helps coordinate movement. These symptoms can look different in every child.

This case is the 18th of its kind ever recorded, and the first from Poland. Finding the exact cause can be tricky because the signs vary widely. Modern genetic tests that scan the whole genome are changing that, allowing doctors to match a patient's features to a specific mutation. By tracing the path from genotype to phenotype, families can get a clearer diagnosis and better support. The more researchers learn about these rare changes, the easier it becomes to help affected individuals.

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