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2017 ; 18
(1
): 388
Nephropedia Template TP
gab.com Text
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English Wikipedia
Insights into the ancestral organisation of the mammalian MHC class II region
from the genome of the pteropid bat, Pteropus alecto
#MMPMID28521747
Ng JHJ
; Tachedjian M
; Wang LF
; Baker ML
BMC Genomics
2017[May]; 18
(1
): 388
PMID28521747
show ga
BACKGROUND: Bats are an extremely successful group of mammals and possess a
variety of unique characteristics, including their ability to co-exist with a
diverse range of pathogens. The major histocompatibility complex (MHC) is the
most gene dense and polymorphic region of the genome and MHC class II (MHC-II)
molecules play a vital role in the presentation of antigens derived from
extracellular pathogens and activation of the adaptive immune response.
Characterisation of the MHC-II region of bats is crucial for understanding the
evolution of the MHC and of the role of pathogens in shaping the immune system.
RESULTS: Here we describe the relatively contracted MHC-II region of the
Australian black flying-fox (Pteropus alecto), providing the first detailed
insight into the MHC-II region of any species of bat. Twelve MHC-II genes,
including one locus (DRB2) located outside the class II region, were identified
on a single scaffold in the bat genome. The presence of a class II locus outside
the MHC-II region is atypical and provides evidence for an ancient class II
duplication block. Two non-classical loci, DO and DM and two classical, DQ and DR
loci, were identified in P. alecto. A putative classical, DPB pseudogene was also
identified. The bat's antigen processing cluster, though contracted, remains
highly conserved, thus supporting its importance in antigen presentation and
disease resistance. CONCLUSIONS: This detailed characterisation of the bat MHC-II
region helps to fill a phylogenetic gap in the evolution of the mammalian class
II region and is a stepping stone towards better understanding of the immune
responses in bats to viral, bacterial, fungal and parasitic infections.
|*Genomics
[MESH]
|*Phylogeny
[MESH]
|Animals
[MESH]
|Chiroptera/*genetics
[MESH]
|Conserved Sequence
[MESH]
|Evolution, Molecular
[MESH]
|Histocompatibility Antigens Class II/*genetics
[MESH]