The Q359K/T360K mutation causes cystic fibrosis in Georgian Jews

M. Mei-Zahav*, P. Stafler, H. Senderowitz, L. Bentur, G. Livnat, M. Shteinberg, N. Orenstein, L. Bazak, D. Prais, H. Levine, M. Gur, N. Khazanov, L. Simhaev, H. Eliyahu, M. Cohen, M. Wilschanski, H. Blau, H. Mussaffi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The Q359K/T360K mutation, described in Jewish CF patients of Georgian decent, is of questionable clinical significance. Methods: Clinical records of patients with the Q359K/T360K mutation from three CF centers were studied for phenotypic expression and putative mechanism of dysfunction. Computer models of mutant CFTR were constructed. Results: Nine patients (4 homozygous) of Georgian Jewish origin were included. Age at diagnosis was 9.4 (0.25–38.2) years, median (range). Sweat chloride was 106 ± 13 meq/L, mean ± SD. Nasal Potential Difference performed in three, was abnormal. All had pulmonary symptoms since early childhood and bronchiectasis. Median FEV1 was 88 (40–121)%. Five had chronic mucoid P. aeruginosa. Homozygous patients were pancreatic insufficient. Enzyme supplementation was initiated at 3.8 (1–14.7) years, median (range). Structural models hint at possible interference of this mutation with transmembrane chloride transport. Conclusion: In our cohort, the Q359K/T360K mutation resulted in a severe CF phenotype, although with residual early CFTR function. The CFTR2 database should consider defining this mutation as CF-causing.

Original languageEnglish
Pages (from-to)e41-e45
JournalJournal of Cystic Fibrosis
Volume17
Issue number5
DOIs
StatePublished - Sep 2018

Funding

FundersFunder number
Cystic Fibrosis Foundation TherapeuticsSENDER13XX0

    Keywords

    • Georgian Jews
    • Q359K/T360K mutation
    • Structural models of CFTR

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