EFL1 mutations impair eIF6 release to cause Shwachman-Diamond syndrome.

Tan S, Kermasson L, Hoslin A, Jaako P, Faille A, Acevedo-Arozena A, Lengline E, Ranta D, Poirée M, Fenneteau O, Ducou le Pointe H, Fumagalli S, Beaupain B, Nitschké P, Bôle-Feysot C, de Villartay JP, Bellanné-Chantelot C, Donadieu J, Kannengiesser C, Warren AJ, Revy P.

Source : Blood

2019 Nov 1

Pmid : 31151987

Abstract

Shwachman-Diamond syndrome (SDS) is a recessive disorder typified by bone marrow failure and predisposition to hematological malignancies. SDS is predominantly caused by deficiency of the allosteric regulator Shwachman-Bodian-Diamond syndrome that cooperates with elongation factor-like GTPase 1 (EFL1) to catalyze release of the ribosome antiassociation factor eIF6 and activate translation. Here, we report biallelic mutations in EFL1 in 3 unrelated individuals with clinical features of SDS. Cellular defects in these individuals include impaired ribosomal subunit joining and attenuated global protein translation as a consequence of defective eIF6 eviction. In mice, Efl1 deficiency recapitulates key aspects of the SDS phenotype. By identifying biallelic EFL1 mutations in SDS, we define this leukemia predisposition disorder as a ribosomopathy that is caused by corruption of a fundamental, conserved mechanism, which licenses entry of the large ribosomal subunit into translation.

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