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Main Authors:	Qu, Meng, Zhang, Yingyi, Woltering, Joost, Liu, Yali, Liu, Zixuan, Wan, Shiming, Jiang, Han, Yu, Haiyan, Chen, Zelin, Wang, Xin, Zhang, Zhixin, Qin, Geng, Schneider, Ralf, Meyer, Axel, Lin, Qiang
Format:	Artículo científico
Language:	en
Published:	Proceedings of the National Academy of Sciences of the United States of America 2025
Subjects:	Animals Symbiosis Anthozoa Smegmamorpha Genome
Online Access:	https://pubmed.ncbi.nlm.nih.gov/40854139/
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Symbiosis with and mimicry of corals were facilitated by immune gene loss and body remodeling in the pygmy seahorse. Qu, Meng Zhang, Yingyi Woltering, Joost Liu, Yali Liu, Zixuan Wan, Shiming Jiang, Han Yu, Haiyan Chen, Zelin Wang, Xin Zhang, Zhixin Qin, Geng Schneider, Ralf Meyer, Axel Lin, Qiang Animals Symbiosis Anthozoa Smegmamorpha Genome A remarkable example of symbiosis involves the pygmy seahorse (). It lives obligatorily on gorgonian corals, mimicking their polyps with pink coloration and skin protuberances. Unique for seahorses, pygmy seahorses retain juvenile paedomorphic stunted snouts, resembling the coral's polyps. We analyzed the tiny seahorse's genome revealing the genomic bases of several adaptations to their mutualistic life including substantial reductions in conserved noncoding elements that are associated with genes in the vicinity of those CNEs that are known to play a role in growth and metamorphosis-related pathways. Comparative RNA- and ATAC-Seq analyses during their ontogeny suggest that their stunted snout might result from craniofacial remodeling associated with defunctionalization. This is consistent also with findings from in situ hybridization and CRISPR experiments. Their immune system shows extremely low numbers of MHC genes and additional considerable losses of other immune-related genes. This is likely facilitated by the host coral's antimicrobial metabolites and by the earlier evolution of male pregnancy that requires immunotolerance.

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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