Identification of Siglec-1 null individuals infected with HIV-1

Identification of Siglec-1 null individuals infected with HIV-1

Online publication: 11/08/2016 Journal: Nature Communications

Abstract:

Siglec-1/CD169 is a myeloid-cell surface receptor critical for HIV-1 capture and infection of bystander target cells. To dissect the role of SIGLEC1 in natura, we scan a large population genetic database and identify a loss-of-function variant (Glu88Ter) that is found in ∼1% of healthy people. Exome analysis and direct genotyping of 4,233 HIV-1-infected individuals reveals two Glu88Ter homozygous and 97 heterozygous subjects, allowing the analysis of ex vivo and in vivo consequences of SIGLEC1 loss-of-function. Cells from these individuals are functionally null or haploinsufficient for Siglec-1 activity in HIV-1 capture and trans-infection ex vivo. However, Siglec-1 protein truncation does not have a measurable impact on HIV-1 acquisition or AIDS outcomes in vivo. This result contrasts with the known in vitro functional role of Siglec-1 in HIV-1 trans-infection. Thus, it provides evidence that the classical HIV-1 infectious routes may compensate for the lack of Siglec-1 in fuelling HIV-1 dissemination within infected individuals.

Authors: Javier Martinez-Picado, Paul J. McLaren, Itziar Erkizia, Maureen P. Martin, Susana Benet, Margalida Rotger, Judith Dalmau, Dan Ouchi, Steven M. Wolinsky, Sudhir Penugonda, Huldrych F. Günthard, Jacques Fellay, Mary Carrington, Nuria Izquierdo-Useros and Amalio Telentic

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