Characterisation of LGP2 complex multitranscript system in humans: role in the innate immune response and evolution from non-human primates.

Retinoic acid inducible gene I (RIG-I)-like receptors (RLRs), including RIG-I, MDA5 and LGP2, recognize viral RNA to mount an antiviral interferon (IFN) response RLRs share three different protein domains: C-terminal domain, DExD/H box RNA helicase domain, and an N-terminal domain with two tandem repeats (CARDs). LGP2 lacks tandem CARD and is not able to induce an IFN response. However, LGP2 positively enhances MDA5 and negatively regulates RIG-I signaling.

Association between HLA-C alleles and COVID-19 severity in a pilot study with a Spanish Mediterranean Caucasian cohort.

The clinical presentations of COVID-19 may range from an asymptomatic or mild infection to a critical or fatal disease. Several host factors such as elderly age, male gender, and previous comorbidities seem to be involved in the most severe outcomes, but also an impaired immune response that causes a hyperinflammatory state but is unable to clear the infection. In order to get further understanding about this impaired immune response, we aimed to determine the association of specific HLA alleles with different clinical presentations of COVID-19.

HLA in Colombia Wayu from Guajira Peninsula Amerindians: Pacific Ocean relationships.

Wayu Amerindians live around Guajira Peninsula shared by Colombia and Venezuela. Wayu from Colombia have been studied for their HLA profile and these data put in context with both genetic and cultural relatedness to Pacific Islanders. HLA-A*24 and HLA-B*35 (most likely HLA-A*24:02 and HLA-B*35:05) and HLA-DRB1*04:03 and HLA-DQB1*03:02 are shared both by Wayu and other Amerindians and Pacific Islanders in specific high frequency.

The first free Africans in America: HLA study in San Basilio de Palenque (Colombia).

Original San Basilio de Palenque population (North Colombia) fled from Spanish traders that carried them as slaves and they funded in nearby Maria Mountains a fortified town (Palenque). They started helping new Africans brought as slaves to flee and join them. Most of them spoke a Bantu-Congo language and nowadays they speak the only one extant Bantu-Spanish Creole language.