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https://doi.org/10.14300/mnnc.2020.15069

Epidemiological and clinical features of «Middle-Urals» variant L138ins in cystic fibr

[Reviews]
Vera Vladislavovna Shadrina; Stanislav Aleksandrovich Krasovsky; Elena Ivanovna Kondratieva; Evgeny Grigorievich Furman;

The article presents a literature review of L138ins variant in the CFTR gene. L138ins is rare variant in patients with cystic fibrosis (CF) in the world. However, it is a frequent variant in CF patients in different regions of Russia, mostly in the Middle Urals. L138ins variant clinically forms «mild» phenotype in patients with CF. Newborn screening was positive but false-negative cases of neonatal screening were also noted. There have been cases of men infertility and the preserving reproductive function in women. According to the literature data, the residual function of CFTR in the culture of bronchial or nasal epithelial cells was low. A good response was obtained on the CFTR corrector lumacaftor and the combination of lumacaftor/ivacaftor in cell culture from CF patients with an L138ins variant.

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Keywords: cystic fibrosis, mild phenotype, CFTR, L138ins