Suppression and overexpression of adenosylhomocysteine hydrolase-like protein 1 (AHCYL1) influences zebrafish embryo development: a possible role for AHCYL1 in inositol phospholipid signaling.
Adenosylhomocysteine hydrolase-like protein 1 (AHCYL1) is a novel intracellular protein with approximately 50% protein identity to adenosylhomocysteine hydrolase (AHCY), an important enzyme for metabolizing S-adenosyl-l-homocysteine, the by-product of S-adenosyl-l-homomethionine-dependent methylation. AHCYL1 binds to the inositol 1,4,5-trisphosphate receptor, suggesting that AHCYL1 is involved in intracellular calcium release. We identified two zebrafish AHCYL1 orthologs (zAHCYL1A and -B) by bioinformatics and reverse transcription-PCR. Unlike the ubiquitously present AHCY genes, AHCYL1 genes were only detected in segmented animals, and AHCYL1 proteins were highly conserved among species. Phylogenic analysis suggested that the AHCYL1 gene diverged early from AHCY and evolved independently. Quantitative reverse transcription-PCR showed that zAHCYL1A and -B mRNA expression was regulated differently from the other AHCY-like protein zAHCYL2 and zAHCY during zebrafish embryogenesis. Injection of morpholino antisense oligonucleotides against zAHCYL1A and -B into zebrafish embryos inhibited zAHCYL1A and -B mRNA translation specifically and induced ventralized morphologies. Conversely, human and zebrafish AHCYL1A mRNA injection into zebrafish embryos induced dorsalized morphologies that were similar to those obtained by depleting intracellular calcium with thapsigargin. Human AHCY mRNA injection showed little effect on the embryos. These data suggest that AHCYL1 has a different function from AHCY and plays an important role in embryogenesis by modulating inositol 1,4,5-trisphosphate receptor function for the intracellular calcium release.
Cooper
Benjamine J
BJ
Dendritic Cell Program, Mater Medical Research Institute, Brisbane, Queensland 4101, Australia.
Key
Brian
B
Carter
Adrian
A
Angel
Nicola Z
NZ
Hart
Derek N J
DN
Kato
Masato
M
D043383:Adenosylhomocysteinase / Q000737:chemistry*; D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015220:Calcium Channels / Q000378:metabolism; D003001:Cloning, Molecular; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D053496:Inositol 1,4,5-Trisphosphate Receptors; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics* / Q000502:physiology*; D008969:Molecular Sequence Data; D010716:Phosphatidylinositols / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism*; D010802:Phylogeny; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D015027:Zebrafish; D029961:Zebrafish Proteins / Q000235:genetics* / Q000502:physiology*
D015220:Calcium Channels; C506926:ITPR1 protein, human; D053496:Inositol 1,4,5-Trisphosphate Receptors; D047908:Intracellular Signaling Peptides and Proteins; D010716:Phosphatidylinositols; D010743:Phospholipids; D018160:Receptors, Cytoplasmic and Nuclear; D029961:Zebrafish Proteins; C513847:adenosylhomocysteine hydrolase-like protein 1, zebrafish; D043383:Adenosylhomocysteinase