Brooding fathers, not siblings, take up nutrients from embryos
Brooding fathers, not siblings, take up nutrients from embryos
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DOI：
10.1098/rspb.2009.1767
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发表时间：
2010-03-22
影响因子：
4.7
通讯作者：
Kvarnemo, Charlotta
中科院分区：
文献类型：
--
作者：
Sagebakken, Gry;Ahnesjo, Ingrid;Kvarnemo, Charlotta
众所周知，许多具有胎盘状结构的动物为胚胎提供营养和氧气。然而，我们在这里证明了营养物质可以通过另一种方式从胚胎传递到父母。这项研究是在一种名为Syngnathus typhle的管鱼身上进行的，雄性管鱼在育儿袋里孵化受精卵数周。早期的研究发现，在育雏期间，胚胎数量会减少，但这些“减少”的胚胎中的营养物质的命运尚不清楚。在这项研究中，我们考虑的是：(i)育雏雄性吸收营养，（ii）兄弟姐妹吸收营养，或（iii）两者兼而有之。雄性与两组雌性交配，其中一组有放射性标记的卵（使用c -14标记的氨基酸），因此育儿袋中大约一半的卵被标记。这使我们能够追踪这些胚胎对营养的吸收。我们检测到c -14标记的氨基酸转移到雄性育儿袋，肝脏和肌肉组织。然而，我们没有检测到任何显著的c -14标记的氨基酸吸收在育儿袋中未标记的同父异母兄弟姐妹。因此，据我们所知，我们首次表明，雄性通过其父亲的育儿袋吸收来自胚胎的营养。
It is well known that many animals with placenta-like structures provide their embryos with nutrients and oxygen. However, we demonstrate here that nutrients can pass the other way, from embryos to the parent. The study was done on a pipefish, Syngnathus typhle, in which males brood fertilized eggs in a brood pouch for several weeks. Earlier research has found a reduction of embryo numbers during the brooding period, but the fate of the nutrients from these 'reduced' embryos has been unknown. In this study, we considered whether (i) the brooding male absorbs the nutrients, (ii) siblings absorb them, or (iii) a combination of both. Males were mated to two sets of females, one of which had radioactively labelled eggs (using C-14-labelled amino acids), such that approximately half the eggs in the brood pouch were labelled. This allowed us to trace nutrient uptake from these embryos. We detected that C-14-labelled amino acids were transferred to the male brood pouch, liver and muscle tissue. However, we did not detect any significant C-14-labelled amino-acid absorption by the non-labelled half-siblings in the brood pouch. Thus, we show, to our knowledge, for the first time, that males absorb nutrients derived from embryos through their paternal brood pouch.