Gene/Protein Disease Symptom Drug Enzyme Compound
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Here we report on a patient with findings of acrocephaly, craniosynostosis, low frontal hairline, ptosis of eyelids, deviated nasal septum, broad great toes, moderate hallux valgus, bilateral symmetrical complete soft tissue syndactyly of toes 2 and 3, and partial soft tissue syndactyly of toes 4 and 5 consistent with the diagnosis of Saethre-Chotzen syndrome. Additionally, the patient had some unusual findings as part of generalized dysfunction of the renal tubules including hypophosphatemia with renal phosphate wasting, normocalcemic hypercalciuria, hypomagnesemia with renal magnesium wasting, low-molecular-weight proteinuria, decreased serum PTH levels, osteopenia, and nephrolithiasis. In the light of these findings, the diagnosis of incomplete renal Fanconi syndrome was made. In conclusion, on the basis of the present findings, it is difficult to say whether renal tubular dysfunction are somehow connected to the Saethre-Chotzen syndrome or not. Therefore, we consider that this is probably just a coincident. However, further studies may show the connection between renal tubular dysfunction and Saethre-Chotzen syndrome.
Nephron 2002 Oct
PMID:Saethre-Chotzen syndrome presenting with incomplete renal Fanconi syndrome. 1221 32

Focal segmental glomerulosclerosis (FSGS) is caused by various etiologies, with mitochondrial dysfunction being one of the causes. FSGS is known to be associated with mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS), which is a subclass of mitochondrial disease. However, it has rarely been reported in other mitochondrial disease subclasses. Here, we reported a 20-year-old man diagnosed with FSGS associated with chronic progressive external ophthalmoplegia (CPEO) due to mitochondrial DNA (mtDNA) 3243A>G mutation. He presented with left ptosis, short stature, mild sensorineural deafness, and cardiac conduction block. A renal biopsy sample showed segmental sclerosis and adhesions between capillaries and Bowman's capsule, indicating FSGS. Electron microscopy demonstrated abnormal aggregated mitochondria in podocytes, and the basement membrane and epithelial cells of Bowman's capsule. Skeletal muscle biopsy also showed accumulation of abnormal mitochondria. mtDNA analysis identified heteroplasmic mtDNA 3243A>G mutation with no large-scale deletions. From these findings, we diagnosed the case as CPEO with multi-organ involvement including FSGS. Our report demonstrates that CPEO, as well as MELAS, can be associated with FSGS. Because mitochondrial disease presents with a variety of clinical symptoms, atypical cases with non-classical manifestations are observed. Thus, mitochondrial disease should be considered as an underlying cause of FSGS with systemic manifestations even with atypical phenotypes.
Nephron 2018
PMID:Focal Segmental Glomerulosclerosis Associated with Chronic Progressive External Ophthalmoplegia and Mitochondrial DNA A3243G Mutation. 2919 Jun 34