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OJVRTM
Online Journal of Veterinary Research©
Volume 22 (5):356-361, 2018.
Effect of
aryl alkyl amine-N-acetyl-transferase gene polymorphism on melatonin in
non-seasonal ewes
Saad Akram
Hatif1, Laith Sofian Younis2
1College
of Veterinary Medicine, University of Baghdad, 2College of
Veterinary Medicine, University of Tikrit,
Iraq
ABSTRACT
Hatif SA, Younis
LS., Effect of aryl alkyl amine-N-acetyl-transferase gene polymorphism on
melatonin in non-seasonal ewes, Onl J Vet Res 22 (5):356-361, 2018. Jugular blood was
taken from 20 Awasi ewes lambing out of season during
October, November and December 2016 for amplification and sequencing of Ovis aries
AA-NAT gene. We also collected 40 blood samples for plasma melatonin at 3:00 PM
and 9:00 PM from 20 non-seasonal ewes which had had estrus during the previous Spring. Two primer amplified regions of the AA-NAT gene were
compared with BLAST to confirm the gene and PCR-RFLP was used to detect
polymorphisms. Melatonin in plasma was measured with an ELISA kit. Results
showed a missense mutation in exon III A 1672 R that made a change in arginine to
arginine C glycine and histidine to arginine & histidine and in C 1690 Y from alanine to valine and
alanine. Two silent mutations (C 1676 T and A 1721 G) showed no change in amino
acids. AG and GG Ovis aries AA-NAT genotypes appeared as single
nucleotide polymorphisms (SNP) A 1665 R and A 1665 G. SNP A 1665 R may enhance
AA-NAT, melatonin levels and reproduction. We found significant differences
(P<0.05) in plasma melatonin levels between GG (31.034 ± 2.06 pg/ml) and AG (27.0715 ± 1.52 pg/ml) genotypes.
Key words: AA-NAT gene, Polymorphism, melatonin ewes.
Raw data files supplied as appendix tables at end of
document.
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