Killer cell immunoglobulin-like receptors (KIRs) are transmembrane glycoproteins expressed by natural killer cells and subsets of T cells. The KIR genes are polymorphic and highly homologous and they are found in a cluster on chromosome 19q13.4 within the 1 Mb leukocyte receptor complex (LRC). The gene content of the KIR gene cluster varies among haplotypes, although several 'framework' genes are found in all haplotypes (KIR3DL3, KIR3DP1, KIR3DL4, KIR3DL2). The KIR proteins are classified by the number of extracellular immunoglobulin domains (2D or 3D) and by whether they have a long (L) or short (S) cytoplasmic domain. KIR proteins with the long cytoplasmic domain transduce inhibitory signals upon ligand binding via an immune tyrosine-based inhibitory motif (ITIM), while KIR proteins with the short cytoplasmic domain lack the ITIM motif and instead associate with the TYRO protein tyrosine kinase binding protein to transduce activating signals. The ligands for several KIR proteins are subsets of HLA class I molecules; thus, KIR proteins are thought to play an important role in regulation of the immune response. This gene is one of the 'framework' loci that is present on all haplotypes. Alternate alleles of this gene are represented on multiple alternate reference loci (ALT_REF_LOCs). Alternative splicing results in multiple transcript variants, some of which may not be annotated on the primary reference assembly. [provided by RefSeq, Jul 2016].
Description
The RefSeq Genes track shows known human protein-coding and
non-protein-coding genes taken from the NCBI RNA reference sequences
collection (RefSeq). The data underlying this track are updated weekly.
Please visit the Feedback for Gene and Reference Sequences (RefSeq) page to
make suggestions, submit additions and corrections, or ask for help concerning
RefSeq records.
For more information on the different gene tracks, see our Genes FAQ.
Display Conventions and Configuration
This track follows the display conventions for
gene prediction tracks.
The color shading indicates the level of review the RefSeq record has
undergone: predicted (light), provisional (medium), reviewed (dark).
The item labels and display colors of features within this track can be
configured through the controls at the top of the track description page.
- Label: By default, items are labeled by gene name. Click the
appropriate Label option to display the accession name instead of the gene
name, show both the gene and accession names, or turn off the label
completely.
- Codon coloring: This track contains an optional codon coloring
feature that allows users to quickly validate and compare gene predictions.
To display codon colors, select the genomic codons option from the
Color track by codons pull-down menu. For more information about this
feature, go to the
Coloring Gene Predictions and Annotations by Codon page.
- Hide non-coding genes: By default, both the protein-coding and
non-protein-coding genes are displayed. If you wish to see only the coding
genes, click this box.
Methods
RefSeq RNAs were aligned against the human genome using BLAT. Those
with an alignment of less than 15% were discarded. When a single RNA
aligned in multiple places, the alignment having the highest base identity
was identified. Only alignments having a base identity level within 0.1% of
the best and at least 96% base identity with the genomic sequence were kept.
Credits
This track was produced at UCSC from RNA sequence data generated by scientists
worldwide and curated by the NCBI
RefSeq project.
References
Kent WJ.
BLAT - the BLAST-like alignment tool.
Genome Res. 2002 Apr;12(4):656-64.
PMID: 11932250; PMC: PMC187518
Pruitt KD, Brown GR, Hiatt SM, Thibaud-Nissen F, Astashyn A, Ermolaeva O, Farrell CM, Hart J,
Landrum MJ, McGarvey KM et al.
RefSeq: an update on mammalian reference sequences.
Nucleic Acids Res. 2014 Jan;42(Database issue):D756-63.
PMID: 24259432; PMC: PMC3965018
Pruitt KD, Tatusova T, Maglott DR.
NCBI Reference Sequence (RefSeq): a curated non-redundant sequence database of genomes, transcripts and proteins.
Nucleic Acids Res. 2005 Jan 1;33(Database issue):D501-4.
PMID: 15608248; PMC: PMC539979
US Server