Biomaterial Database

Restriction fragment length polymorphism of HLA-DQ and -DR allogenotypes in normal southern Chinese. 1993

P K Li, and A S Poon, and B R Hawkins, and V T Yeung, and Y H Bo, and K N Lai

Department of Medicine, Prince of Wales Hospital, Chinese University of Hong Kong.

We have examined the Taq I restriction fragment length polymorphism (RFLP) of the MHC class II regions of 96 normal Southern Chinese with respect to the HLA-DRB, -DQA, and -DQB genes. The data were compared with the DR and DQ serotyping. RFLP correlates well with the serological typing of the DR types of Chinese. Variants are seen in DR2 and DR12. The variant in DR12 with a 10 kb at the upper band (DR12b) is not found in Caucasoids and is more frequent in Chinese (19.4% of the alleles). With the help of DQA and DQB RFLP the assignment of genotyping of DRB types is facilitated. Some of the linkage disequilibrium patterns among DRB, DQA and DQB are different from Caucasoids. This is particularly obvious in the DR2 and DR5 haplotypes. In the 96 Southern Chinese, the 3 commonest haplotype frequencies are: DR12b, DQ alpha 1b, DQ beta 3b (18.3%); DR9, DQ alpha 3, DQ beta 3a (15.7%); DR4, DQ alpha 3, DQ beta 3a (14.2%). The various DR beta, DQ alpha. DQ beta genes can be accurately defined in Chinese by RFLP. Polymerase chain reactions using sequence-specific primers were performed to confirm the various HLA-DRB and -DQB alleles. The use of RFLP is important in the study of HLA matching and HLA-disease association in Southern Chinese.

UI	MeSH Term	Description	Entries
D009626	Terminology as Topic	Works about the terms, expressions, designations, or symbols used in a particular science, discipline, or specialized subject area.	Etymology,Nomenclature as Topic,Etymologies
D012150	Polymorphism, Restriction Fragment Length	Variation occurring within a species in the presence or length of DNA fragment generated by a specific endonuclease at a specific site in the genome. Such variations are generated by mutations that create or abolish recognition sites for these enzymes or change the length of the fragment.	RFLP,Restriction Fragment Length Polymorphism,RFLPs,Restriction Fragment Length Polymorphisms
D004247	DNA	A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).	DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D005838	Genotype	The genetic constitution of the individual, comprising the ALLELES present at each GENETIC LOCUS.	Genogroup,Genogroups,Genotypes
D006683	HLA-DQ Antigens	A group of the D-related HLA antigens found to differ from the DR antigens in genetic locus and therefore inheritance. These antigens are polymorphic glycoproteins comprising alpha and beta chains and are found on lymphoid and other cells, often associated with certain diseases.	HLA-DC Antigens,HLA-MB Antigens,HLA-DC,HLA-DQ,HLA-DS,HLA-DS Antigens,HLA-LB,HLA-LB Antigens,HLA-MB,Antigens, HLA-DC,Antigens, HLA-DQ,Antigens, HLA-DS,Antigens, HLA-LB,Antigens, HLA-MB,HLA DC Antigens,HLA DQ Antigens,HLA DS Antigens,HLA LB Antigens,HLA MB Antigens
D006684	HLA-DR Antigens	A subclass of HLA-D antigens that consist of alpha and beta chains. The inheritance of HLA-DR antigens differs from that of the HLA-DQ ANTIGENS and HLA-DP ANTIGENS.	HLA-DR,Antigens, HLA-DR,HLA DR Antigens
D006723	Hong Kong	The former British crown colony located off the southeast coast of China, comprised of Hong Kong Island, Kowloon Peninsula, and New Territories. The three sites were ceded to the British by the Chinese respectively in 1841, 1860, and 1898. Hong Kong reverted to China in July 1997. The name represents the Cantonese pronunciation of the Chinese xianggang, fragrant port, from xiang, perfume and gang, port or harbor, with reference to its currents sweetened by fresh water from a river west of it.	Kowloon,New Territories,Hongkong
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D016133	Polymerase Chain Reaction	In vitro method for producing large amounts of specific DNA or RNA fragments of defined length and sequence from small amounts of short oligonucleotide flanking sequences (primers). The essential steps include thermal denaturation of the double-stranded target molecules, annealing of the primers to their complementary sequences, and extension of the annealed primers by enzymatic synthesis with DNA polymerase. The reaction is efficient, specific, and extremely sensitive. Uses for the reaction include disease diagnosis, detection of difficult-to-isolate pathogens, mutation analysis, genetic testing, DNA sequencing, and analyzing evolutionary relationships.	Anchored PCR,Inverse PCR,Nested PCR,PCR,Anchored Polymerase Chain Reaction,Inverse Polymerase Chain Reaction,Nested Polymerase Chain Reaction,PCR, Anchored,PCR, Inverse,PCR, Nested,Polymerase Chain Reactions,Reaction, Polymerase Chain,Reactions, Polymerase Chain
D044465	White People	Persons having origins in any of the white racial groups of Europe, the Middle East, or North Africa. Note that OMB category WHITE is available for the United States population groups. Race and ethnicity terms, as used in the federal government, are self-identified social construct and may include terms outdated and offensive in MeSH to assist users who are interested in retrieving comprehensive search results for studies such as in longitudinal studies.	European Continental Ancestry Group,White Person,Caucasian Race,Caucasoid Race,Caucasian Races,Caucasoid Races,People, White,Person, White,Race, Caucasian,Race, Caucasoid,White Peoples,White Persons