Detection of a novel HLA-B allele, HLA-B*39:119, in a Chinese individual

HLA-B*39:119 allele differs from HLA-B*39:01:01:01 by a single nucleotide substitution at position 488.

A study of HLA-B*15:02 in 9 different Chinese ethnics: Implications for carbamazepine related SJS/TEN

BACKGROUND

HLA-B*15:02 is a known biomarker for carbamazepine (CBZ)-induced Stevens-Johnson syndrome and toxic epidermal necrolysis (SJS/TEN) in some ethnic populations. The US FDA recommends B*15:02 screening for Asian and other populations with a high prevalence of B*15:02 prior to treatment with CBZ to prevent drug-related SJS/TEN.

MATERIALS AND METHODS

A total of 1607 blood samples were collected from volunteer blood donors who were ethnic minorities living in the Yunnan province of southwestern China, including 153 Yi, 193 Naxi, 167 Miao, 156 Lisu, 166 Derung, 211 Bai, 184 Hani, 198 Dai, and 179 Zhuang. The genetic diversity of the HLA-B*15:02 genes in the ethnic minority samples was examined using sequence based typing at high resolution.

RESULTS

The allele frequencies of HLA-B*15:02 in the Yi, Naxi, Miao, Lisu, Derung, Bai, Hani, Dai, and Zhuang populations were 4.25%, 4.4%, 5.09%, 5.77%, 6.33%, 7.82%, 8.15%, 9.6%, and 15.36%, respectively. The frequencies of HLA-B*15:02 carriers in the Yi, Naxi, Miao, Lisu, Derung, Bai, Hani, Dai, and Zhuang populations were 8.5%, 8.8%, 9.58%, 10.9%, 12.65%, 15.64%, 16.3%, 18.69%, and 28.49%, respectively.

CONCLUSION

The HLA-B*15:02 allele frequencies indicated that the prevalence of B*15:02 was different among the different ethnic populations. Because the number of carriers of B*15:02 was high in some ethnic populations, larger studies are required to confirm these findings. The Zhuang population had the highest frequency of B*15:02 in this study. More attention should be paid to CBZ-induced SJS/TEN in Chinese minority populations.

HLA-B*46:40:02, a novel HLA-B*46 allele identified in a Chinese individual by sequence-based typing

HLA-B*46:40:02 has one synonymous nucleotide change from HLA-B*46:40:01 in codon 23, exon 2 (ATT>ATC).

HLA-B*58:63, a novel allele identified by sequence-based typing in a Chinese bone marrow voluntary donor

HLA-B*58:63 differs from HLA-B*58:01:01 by one nucleotide at position 248 resulting in a single amino acid change.

Identification of a novel HLA-A*24 allele, A*24:289, in a Chinese individual

The new allele, A*24:289 is different to A*24:03:01 at codons 151, 152 and 156 at exon 3.

Prevalence of post-traumatic stress disorder among adolescents after the Wenchuan earthquake in China

BACKGROUND

The Wenchuan earthquake was a catastrophic earthquake in China. The aim of this study is to explore longitudinally the rates of post-traumatic stress disorder (PTSD) and depression in adolescents after the Wenchuan earthquake, and to identify independent predictors of PTSD.

METHOD

PTSD and depression symptoms among adolescents at 6, 12 and 18 months after the Wenchuan earthquake were investigated using the PTSD Checklist Civilian Version and the Beck Depression Inventory (BDI). Subjects in this study included 548 high school student survivors in a local boarding high school.

RESULTS

The rates of PTSD symptoms were 9.7%, 1.3% and 1.6% at the 6-, 12- and 18-month follow-ups, respectively. BDI scores were found to be the best predictor of severity of PTSD at 6, 12 and 18 months. Gender was another variable contributing significantly to PTSD at 6 and 12 months after the earthquake. In the 12-month follow-up, home damage was found to be a predictor of severity of PTSD symptoms. Being a child with siblings was found to be a predictor of severity of PTSD symptoms at 12 and 18 months after the earthquake.

CONCLUSIONS

PTSD symptoms changed gradually at various stages after the earthquake. Depression symptoms were predictive of PTSD symptoms in the 18-month follow-up study. Other predictors of PTSD symptoms included female gender and being a child with siblings. The results of this study may be helpful for further mental health interventions for adolescents after earthquakes.