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Kidd Blood Group System

Gene locus - SLC14A1


The protein carrying the antigen for the Kidd blood group is a product of a single gene, SLC14A1 (Solute carrier family 14, member 1; previously known as JK,HUT11) of the urea-transporter gene family. It is an integral membrane glycoprotein with 10 membrane-spanning domains. As a urea transporter it may play a role in preserving the osmotic stability and deformability of the erythrocyte. The erythroid transporter gene bears 61% sequence identity to the human kidney urea transporter.

The genes

The gene is organized in 11 exons distributed over 30 kb. The mature 45-kd protein is encoded by exons 4-11. Chromosomal location of the SLC14A1 gene is 18q12-q21.

Function of proteins

Urea transporter

Tissue distribution

erythocytes, white blood cells(?), kidney medulla (information still incomplete due to the existence of homologs)

Disease association

Individuals lacking the expression of the Kidd blood antigen show a lack or reduced carrier-mediated urea transport and decreased ability for urine concentration (Sands et al. PMID 1498276)

About the alleles

Among the documented variant alleles of SLC14A1 the majority encode the JK null phenotype and may fail to express the protein on the red cell surface. This phenotype is rare in world population, but has been observed in Asia, Polynesia, Finland and Japan.Red cells of Jk(a-b-) individuals are resistant to lysis by 2M urea, and that finding can be used as a screening test for this phenotype. The two alleles that encode the common antigens JKA and JKB ( also known as JK 01 and JK 02, respectively) differ at nucleotide 838 ( JKA , GAC=D , JKB, AAC=N); because of some discrepancies in the reference sequences used in different publications the numbering of nucleotides may also differ; here the JKB sequence acc. no. NM_015865.1 (version1 ) is used as reference.Note that for a number of alleles, the publication record does not always include sequencing results of the epitopic region (JKAvsJKB)

When searching for a particular allele, use "name" if DNA alteration is known or, if you wish to search by phenotype or the designation used by author, use "alias" (see "Details").

Other database IDs and links

NCBI genes Uniprot ID Genbank proteins Gene nomenclature database ID Genbank nucleic acids
NM_015865.6 for the JKA allele of SLC14A`
NCBI dbSNP for single nucleotide polymorphisms OMIM ID - at Online Mendelian Inheritance in Man


New PubMed entries with the terms Kidd and blood from the last 30 days.
NCBI Book Sections with the terms Kidd and blood.


Marion E. Reid
New York Blood Center
310 East 67 St
New York, N.Y.10021

OO Blumenfeld

Contributors for specific alleles are listed with the alleles.


Updated 2014-09-06 02:23:45.223
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