HLA-DRB1*13:99, a novel HLA-DRB1*13 allele identified by sequence-based typing

The new allele DRB1*13:99 showed one nucleotide difference with DRB1*13:02:01 at codon 51 (ACG/AAG).     

A novel HLA-DRB1*13 allele (DRB1*1357) identified by polymerase chain reaction with sequence-specific primers and direct sequencing

We describe the identification of a new DRB1*13 allele, DRB1*1357*, found in two Austrian Caucasian individuals. The novel allele was initially suspected because analysis with sequence-specific primers resulted in an unusual pattern of amplification. Thereafter, exon 2 was further characterized by sequence-based typing. The nucleotide sequence of DRB1*1357 is identical to DRB1*1319 except for a single substitution in codon 47 (TAC to TTC) leading to a change from phenylalanine to tyrosine.     

Identification of a new HLA-DRB4 allele (DRB4*01033) by PCR-SSP and direct sequencing

In this report, we describe the identification of a novel DRB4*01 allele, DRB4*01033, found in two Spanish Caucasian individuals. The new allele was detected during routine HLA typing by an unusual pattern of amplification obtained by polymerase chain reaction using sequence-specific primers (PCR-SSP) that did not match with any of the previously described DRB4 alleles. In order to establish the polymorphism responsible for this pattern exons 2 and 3 of the DRB4 locus were amplified and directly sequenced. The new DRB4*01 allele is identical to DRB4*0103101 except for a single nucleotide substitution in codon 78 (TAC-->TAT). This nucleotide change does not cause an amino acid change as both triplets code for a tyrosine.     

Characterization of a new HLA-DRB1*01 allele (HLA-DRB1*010203) in a Caucasian Italian family by using sequence-based typing

We report the identification of an HLA-DRB1*01 nucleotide sequence variant in three members of a Caucasian Italian family by using sequence-based typing. The nucleotide sequence of exon 2 observed in the new allele is identical to that of HLA-DRB1*010201 except in position 189 (codon 34) where the adenine of the consensus was replaced by a guanine and it was designated officially as HLA-DRB1*010203* by the WHO Nomenclature Committee.     

Direct sequencing of a HLA-DRB gene by polymerase chain reaction: sequence variation in DRw8 specificity

The nucleotide sequence of a HLA-DRB gene with a predominant subtype of DRw8 specificity in Japanese (DR8.1) was determined with single-stranded DNA enzymatically amplified by polymerase chain reaction (PCR). The sequence differs at a single amino acid from both of the published DRw8/Dw8.1 and DRw8/Dw8.2 sequences: isoleucine67(AUC) instead of phenylalanine67(TTC) in DRw8/Dw8.1 and serine57(AGC) instead of aspartic acid57(GAT) in DRw8/Dw8.2. On the other hand the DR8.1 and DRw8/Dw8.3 have the same amino acid sequence although one silent nucleotide substitution has occurred between the two sequences. These results indicate that Japanese DR8.1 specificity corresponds to DRw8/Dw8.3. Furthermore, an oligonucleotide probe specific for this sequence was synthesized and hybridized with 33 HLA-typed controls. This probe clearly distinguished the particular subtype from other DRw8 subtypes and specificities.     

Characterization of a new HLA-DRB3 allele,DRB3*0217, by direct sequencing

We report the identification of a novel DRB3*02 using sequence-based typing (SBT). This new allele, officially named DRB3*0217, was detected while performing HLA high resolution typing of a bone marrow recipient and his siblings. DNA sequencing demonstrated the presence of a nucleotide substitution in exon 2 at position 199 where a C was substituted by a T. This point mutation at codon 67 (CTC-->TTC) has resulted in an amino acid substitution from Leucine to Phenylalanine.     

A new HLA-DRB1*11 allele, DRB1*1144, identified by cloning and sequencing

We report here the identification of a novel DRB1*11 allele, DRB1*1144, identified during sequence-based HLA-DRB1 typing. Molecular cloning and direct sequencing confirmed that the new allele is identical to DRB1*110401 at exon 2, except for a single nucleotide substitution (GTG-->GCG) changing codon 38 from Valine to Alanine.     

A novel HLA-DR13 allele (DRB11314) identified by single-strand conformation polymorphism analysis and confirmed by direct sequencing

A novel variant of the HLA-DR13 group is described. The new allele was found in a DR 10, 13 heterozygous patient of Turkish origin, two HLA genotypically identical children of the patient typed as DR11, 13, and one child typed as DR13, 13. DR13 subtyping of the patient was initially performed by SSCP analysis of PCR-amplified DNA, using the 11th IHWS primers DRBAMP-3 and DRBAMP-B. Due to an unusual SSCP banding pattern, the PCR product was subjected to solid-phase sequencing. The sequence of the new allele, DRB1^*1314, is different from that of DRB 1^*1307 by a single nucleotide substitution in codon 47, with T replacing consensus A. This results in a single amino acid change of tryptophan to phenylalanine in the first domain of the DRβ chain.     

A novel HLA-DRB1 allele, DRB1*0832, identified by sequence-based typing method

Human leukocyte antigen-DRB1*0832 may have arisen by gene conversion from a DRB1*080302 backbone, leading to amino acid changes at codons 26, 28, 30, 32, 37, and 38.     

HLA-DRB1*0908, a new allele was identified by sequence-based typing in a Korean individual

A new human leukocyte antigen DRB1*0908 differs from GTC to AGC in DRB1*090102 at codon 57 with a coding change, valine to serine.     

A new DRB1*15 allele (DRB1*1506) identified by sequence-based typing

A new DRB1*15 allele (DRB1*1506) was detected during the studies of the 12th International Histocompatibility Workshop within the Allele and Haplo-type Society #11 which studied the DR2 and DR51 antigens. The new allele was found in four unrelated Asian Indian individuals by sequence-based typing. It has a base substitution from T to C in codon 50 at a previously considered conserved position.     

A new HLA-DRB allele (DRB1*15014) identified in a Caucasian individual

Polymerase chain reaction with sequence specific primers subtyping of a DRB1*15 allele in a male 11-year-old German Caucasian and his father revealed a reaction pattern that did not agree with any known specificity, thus suggesting the existence of a novel allele. Sequence-based typing after allelic separation revealed the new allele human leukocyte antigen (HLA)-DRB1*15014. The sequence pattern of HLA-DRB1*15014 might have been generated as a result of two independent recombinations, most likely over several generations.     

A novel HLA-DRB1*12 allele, DRB1*12:16:02, identified by sequence-based typing

The novel allele DRB1*12:16:02 allele showed two single nucleotide differences with HLA-DRB1*12:16:01 at nucleotides 303 G>C and 321 C>T in exon 2.