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The elongation factor 1 alpha 1 (EEF1A1), an isoform of EEF1A, is one of the most abundant cytoplasmic proteins and an important component of the translational machinery. We investigated the relative expression, alternative polyadenylation (APA), and changes in poly(A) tail length of EEF1A1 mRNA in the endometrial caruncle (CAR) and intercaruncle (ICAR) at early and mid-gestation in Japanese Black cattle. The relative EEF1A1 mRNA expression levels in the CAR were the highest on Gestation day 20 and were significantly decreased at mid-gestation. The expression levels in the ICAR were significantly higher than those in the CAR, and the gestation stage had no significant impact. Four different EEF1A1 transcripts with distinct 3' untranslated regions (UTRs) (proximal and distal types) and poly(A) tails (medium and short types) of different lengths were identified. The EEF1A1 mRNAs with distal 3' UTR and medium-length poly(A) tails were specific from the CAR of uterus horn at early gestation. RNA-sequencing data analyses revealed that the HSF1, MZF1, E47, SRF, GATA2, GATA3, GATA6, HNF-3 beta (FOXA2), CPSF1, and Ataxin-2 genes might affect the EEF1A1 gene expression or poly(A) length.
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