Identification, characterization and expression analyses of PC4 genes in Yesso scallop (Patinopecten yessoensis) reveal functional differentiations in response to ocean acidification

Highlights

  • Seven PC4s genes (PyPC4s) were identified in Patinopecten yessoensis genome.
  • Phylogenetic analysis confirmed gene expansion and evolutionary relationship of PyPC4s.
  • PyPC4s showed functional roles in growth and development of Yesso scallop.
  • Expression regulations of PyPC4s showed a time-dependent pattern with functional complementation in response to low pH stress.
  • Our data provide novel clues to inductively functional differentiations of PyPC4s in response to OA.

Abstract

Transcriptional coactivator p15 (PC4), considered a multifunctional chromosome associated protein, is actively involved in transcription regulation, DNA replication, damage repair and chromosome formation. Although studies have reported significant effects of PC4 in most vertebrates and some invertebrates, the complete PC4 gene members are less systematically identified and characterized in scallops. In this study, seven PC4 genes (PyPC4s) were identified in the Yesso scallop Patinopecten yessoensis using whole-genome scanning via bioinformatic analyses. Phylogenetic and protein structural analyses were performed to determine the identities and evolutionary relationships of the seven genes. Expression profiles of PyPC4s were further investigated in embryos/larvae at all developmental stages, healthy adult tissues, and mantles that were exposed to low pH stress (pH 6.5 and 7.5) with different time durations (3, 6, 12 and 24 h). Spatiotemporal expression patterns indicated the functional roles of PyPC4s at all development stages and in healthy adult tissues, with PY-3235.33 demonstrating remarkably high constitutive expressions. Expression regulations (up- and down-regulation) of PyPC4s under low pH stress levels demonstrated a time-dependent pattern with functional complementation and/or enhancement, revealing that PyPC4s exhibited differentiated functions in response to ocean acidification (OA). Collectively, our data offer a novel perspective stating that low pH is a potential inducer leading to functional differentiation of PyPC4s in scallops. The results provide preliminary information on the versatile roles of PC4(s) in bivalves in response to OA.

Zhang J., Liao H., Xun X., Hou X., Zhu X., Xing Q., Huang X., Hu J. & Bao Z., 2022. Identification, characterization and expression analyses of PC4 genes in Yesso scallop (Patinopecten yessoensis) reveal functional differentiations in response to ocean acidification. Aquatic Toxicology 244: 106099. doi: 10.1016/j.aquatox.2022.106099. Article (subscription required).


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