Siglecs(Sialic acid-binding immunoglobulin-type lectins) are cell surface proteins that bind sialic acid. They are found primarily on the surface of immune cells and are a subset of the I-type lectins. There are 14 different mammalian Siglecs, providing an array of different functions based on cell surface receptor-ligand interactions.
CD22, or cluster of differentiation-22, is a molecule belonging to the SIGLEC family of lectins. It is found on the surface of mature B cells and to a lesser extent on some immature B cells. Generally speaking, CD22 is a regulatory molecule that prevents the overactivation of the immune system and the development of autoimmune diseases.
Sialoadhesin (SIGLEC-1) is a cell adhesion molecule found on the surface of macrophages. It is found in especially high amounts on macrophages of the spleen, liver, lymph node, bone marrow, colon, and lungs.
CD33 or Siglec-3 is a transmembrane receptor expressed on cells of myeloid lineage. It is usually considered myeloid-specific, but it can also be found on some lymphoid cells.
Beta-galactoside alpha-2,6-sialyltransferase 1 is an enzyme that in humans is encoded by the ST6GAL1 gene.
Sialic acid-binding Ig-like lectin 7 is a protein that in humans is encoded by the SIGLEC7 gene. SIGLEC7 has also been designated as CD328.
Sialic acid-binding Ig-like lectin 12, or Siglec-XII, is a protein that in humans, is encoded by the SIGLEC12 gene.
Sialic acid-binding Ig-like lectin 5 is a protein that in humans is encoded by the SIGLEC5 gene. SIGLEC5 has also been designated CD170.
Sialic acid-binding Ig-like lectin 9 is a protein that in humans is encoded by the SIGLEC9 gene.
Sialic acid-binding Ig-like lectin 8 is a protein that in humans is encoded by the SIGLEC8 gene. This gene is located on chromosome 19q13.4, about 330 kb downstream of the SIGLEC9 gene. Within the siglec family of transmembrane proteins, Siglec-8 belongs to the CD33-related siglec subfamily, a subfamily that has undergone rapid evolution.
Alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase 1 is an enzyme that in humans is encoded by the ST6GALNAC1 gene. This enzyme adds a N-acetylneuraminic acid to an O-linked N-acetylgalactosamine (GalNAc) on a peptide/proteins with an α2-6 linkage to produce the sialyl-Tn antigen. It has been shown that the enzyme prefers threonine over serine containing GalNAc residues.
Sialic acid-binding Ig-like lectin 10 is a protein that in humans is encoded by the SIGLEC10 gene. Siglec-G is often referred to as the murine paralog of human Siglec-10
Ajit Varki is a physician-scientist who is distinguished professor of medicine and cellular and molecular medicine, founding co-director of the Glycobiology Research and Training Center at the University of California, San Diego (UCSD), and founding co-director of the UCSD/Salk Center for Academic Research and Training in Anthropogeny (CARTA). He is also executive editor of the textbook Essentials of Glycobiology and distinguished visiting professor at the Indian Institute of Technology in Madras and the National Center for Biological Sciences in Bangalore. He is a specialist advisor to the Human Gene Nomenclature Committee.
The word, sialome, is a junction of the Greek word for saliva (sialos) and the suffix used in molecular biology to reference a totality of some sort, -ome. The name relating to its role in biochemistry.
C-type lectin domain family 10 member A (CLEC10A) also designated as CD301 is a protein that in humans is encoded by the CLEC10A gene. CLEC10A is part of the C-type lectin superfamily and binds to N-Acetylgalactosamine (GalNAc). It is mainly expressed on myeloid cells and also on oocytes and very early stages of embryogenesis. CLEC10A is used as a marker of the CD1c+ dendritic cell subgroup, also called cDC2. The actions of CLEC10A are diverse, depending on the ligand and environment.
Bone metastasis, or osseous metastatic disease, is a category of cancer metastases that result from primary tumor invasions into bones. Bone-originating primary tumors such as osteosarcoma, chondrosarcoma, and Ewing sarcoma are rare; the most common bone tumor is a metastasis. Bone metastases can be classified as osteolytic, osteoblastic, or both. Unlike hematologic malignancies which originate in the blood and form non-solid tumors, bone metastases generally arise from epithelial tumors and form a solid mass inside the bone. Primary breast cancer patients are particularly vulnerable to develop bone metastases. Bone metastases, especially in a state of advanced disease, can cause severe pain, characterized by a dull, constant ache with periodic spikes of incident pain.
Immune checkpoints are regulators of the immune system. These pathways are crucial for self-tolerance, which prevents the immune system from attacking cells indiscriminately. However, some cancers can protect themselves from attack by stimulating immune checkpoint targets.
Translational glycobiology or applied glycobiology is the branch of glycobiology and glycochemistry that focuses on developing new pharmaceuticals through glycomics and glycoengineering. Although research in this field presents many difficulties, translational glycobiology presents applications with therapeutic glycoconjugates, with treating various bone diseases, and developing therapeutic cancer vaccines and other targeted therapies. Some mechanisms of action include using the glycan for drug targeting, engineering protein glycosylation for better efficacy, and glycans as drugs themselves.
Sialic acid-binding Ig-like lectin 6 is a protein that in humans is encoded by the SIGLEC6 gene. The gene was originally named CD33L (CD33-like) due to similarities between these genes but later became known as OB-BP1 due to its ability to bind to this factor and, finally, SIGLEC6 as the sixth member of the SIGLEC family of receptors to be identified. The protein has also been given the CD designation CD327.
GlycoRNAs are small non-coding RNAs with sialylated glycans.
