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Am J Hum Genet. 2012 Jul 13;91(1):15-26. doi: 10.1016/j.ajhg.2012.05.002. Epub 2012 Jun 7.

TMEM165 deficiency causes a congenital disorder of glycosylation.

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Centre National de la Recherche Scientifique UMR, Structural and Functional Glycobiology Unit, University of Lille, Institut Fédératif de Recherche, Villeneuve D'Ascq, France.


Protein glycosylation is a complex process that depends not only on the activities of several enzymes and transporters but also on a subtle balance between vesicular Golgi trafficking, compartmental pH, and ion homeostasis. Through a combination of autozygosity mapping and expression analysis in two siblings with an abnormal serum-transferrin isoelectric focusing test (type 2) and a peculiar skeletal phenotype with epiphyseal, metaphyseal, and diaphyseal dysplasia, we identified TMEM165 (also named TPARL) as a gene involved in congenital disorders of glycosylation (CDG). The affected individuals are homozygous for a deep intronic splice mutation in TMEM165. In our cohort of unsolved CDG-II cases, we found another individual with the same mutation and two unrelated individuals with missense mutations in TMEM165. TMEM165 encodes a putative transmembrane 324 amino acid protein whose cellular functions are unknown. Using a siRNA strategy, we showed that TMEM165 deficiency causes Golgi glycosylation defects in HEK cells.

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