A case report: Alport syndrome and growth hormone deficiency associated with a new COL4A4 mutation.

Background: Alport syndrome (AS) is a rare progressive hereditary kidney disease that is clinically principally associated with hematuria, proteinuria, and progressive renal dysfunction. This condition not only impairs renal function but also potentially affects auditory and ocular health, significantly impacting the patient's quality of life.

Case description: This article reports a young girl with AS, combined with dwarfism attributable to growth hormone (GH) deficiency, diagnosed at Wenzhou People's Hospital in 2019. The clinical data and diagnostic steps were retrospectively analyzed. Genetic testing showed that she carried a new mutation in the COL4A4 gene, c.2317_2318delAG (p.R773Gfs*14), classified as "pathogenic" under the criteria of the American College of Medical Genetics and Genomics (ACMG), confirming her AS diagnosis. Significantly, the patient's height was more than two standard deviations (SDs) below the average for children of her race, sex, and age. The peak GH level post-stimulation was below 5 ng/mL, coupled with a growth rate of less than 5 cm/year, leading to the diagnosis of GH deficiency. Consequently, recombinant human GH (rhGH) therapy was initiated.

Conclusions: After a year of rhGH treatment, we observed a notable increase in her height, without any adverse effects like elevated intracranial pressure, hypothyroidism, or worsening kidney function.