Association of MICA gene polymorphisms with liver fibrosis in schistosomiasis patients in the Dongting Lake region
Braz. j. med. biol. res
;
45(3): 222-229, Mar. 2012. ilus, tab
Article
in English
| LILACS
| ID: lil-618053
ABSTRACT
Major histocompatibility complex class I chain-related A (MICA) is a highly polymorphic gene located within the MHC class I region of the human genome. Expressed as a cell surface glycoprotein, MICA modulates immune surveillance by binding to its cognate receptor on natural killer cells, NKG2D, and its genetic polymorphisms have been recently associated with susceptibility to some infectious diseases. We determined whether MICA polymorphisms were associated with the high rate of Schistosoma parasitic worm infection or severity of disease outcome in the Dongting Lake region of Hunan Province, China. Polymerase chain reaction-sequence specific priming (PCR-SSP) and sequencing-based typing (SBT) were applied for high-resolution allele typing of schistosomiasis cases (N = 103, age range = 36.2-80.5 years, 64 males and 39 females) and healthy controls (N = 141, age range = 28.6-73.3 years, 73 males and 68 females). Fourteen MICA alleles and five short-tandem repeat (STR) alleles were identified among the two populations. Three (MICA*01201/02, MICA*017 and MICA*027) showed a higher frequency in healthy controls than in schistosomiasis patients, but the difference was not significantly correlated with susceptibility to S. japonicum infection (Pc > 0.05). In contrast, higher MICA*A5 allele frequency was significantly correlated with advanced liver fibrosis (Pc < 0.05). Furthermore, the distribution profile of MICA alleles in this Hunan Han population was significantly different from those published for Korean, Thai, American-Caucasian, and Afro-American populations (P < 0.01), but similar to other Han populations within China (P > 0.05). This study provides the initial evidence that MICA genetic polymorphisms may underlie the severity of liver fibrosis occurring in schistosomiasis patients from the Dongting Lake region.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Polymorphism, Genetic
/
Schistosomiasis
/
Histocompatibility Antigens Class I
/
Liver Cirrhosis
Type of study:
Etiology study
/
Incidence study
/
Observational study
/
Prognostic study
/
Risk factors
Limits:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
Country/Region as subject:
Asia
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
2012
Type:
Article
Affiliation country:
China
Institution/Affiliation country:
Central Blood Bank in Yueyang/CN
/
Central South University/CN
Similar
MEDLINE
...
LILACS
LIS