Molecular and paleontological evidence for a post-Cretaceous origin of rodents.

The timing of the origin and diversification of rodents remains controversial, due to conflicting results from molecular clocks and paleontological data. The fossil record tends to support an early Cenozoic origin of crown-group rodents. In contrast, most molecular studies place the origin and initi...

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Autores principales:	Shaoyuan Wu, Wenyu Wu, Fuchun Zhang, Jie Ye, Xijun Ni, Jimin Sun, Scott V Edwards, Jin Meng, Chris L Organ
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5ac753a31f73499b9adb7cec31a1f377
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spelling	oai:doaj.org-article:5ac753a31f73499b9adb7cec31a1f3772021-11-18T08:13:06ZMolecular and paleontological evidence for a post-Cretaceous origin of rodents.1932-620310.1371/journal.pone.0046445https://doaj.org/article/5ac753a31f73499b9adb7cec31a1f3772012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23071573/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203The timing of the origin and diversification of rodents remains controversial, due to conflicting results from molecular clocks and paleontological data. The fossil record tends to support an early Cenozoic origin of crown-group rodents. In contrast, most molecular studies place the origin and initial diversification of crown-Rodentia deep in the Cretaceous, although some molecular analyses have recovered estimated divergence times that are more compatible with the fossil record. Here we attempt to resolve this conflict by carrying out a molecular clock investigation based on a nine-gene sequence dataset and a novel set of seven fossil constraints, including two new rodent records (the earliest known representatives of Cardiocraniinae and Dipodinae). Our results indicate that rodents originated around 61.7-62.4 Ma, shortly after the Cretaceous/Paleogene (K/Pg) boundary, and diversified at the intraordinal level around 57.7-58.9 Ma. These estimates are broadly consistent with the paleontological record, but challenge previous molecular studies that place the origin and early diversification of rodents in the Cretaceous. This study demonstrates that, with reliable fossil constraints, the incompatibility between paleontological and molecular estimates of rodent divergence times can be eliminated using currently available tools and genetic markers. Similar conflicts between molecular and paleontological evidence bedevil attempts to establish the origination times of other placental groups. The example of the present study suggests that more reliable fossil calibration points may represent the key to resolving these controversies.Shaoyuan WuWenyu WuFuchun ZhangJie YeXijun NiJimin SunScott V EdwardsJin MengChris L OrganPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 10, p e46445 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shaoyuan Wu Wenyu Wu Fuchun Zhang Jie Ye Xijun Ni Jimin Sun Scott V Edwards Jin Meng Chris L Organ Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
description	The timing of the origin and diversification of rodents remains controversial, due to conflicting results from molecular clocks and paleontological data. The fossil record tends to support an early Cenozoic origin of crown-group rodents. In contrast, most molecular studies place the origin and initial diversification of crown-Rodentia deep in the Cretaceous, although some molecular analyses have recovered estimated divergence times that are more compatible with the fossil record. Here we attempt to resolve this conflict by carrying out a molecular clock investigation based on a nine-gene sequence dataset and a novel set of seven fossil constraints, including two new rodent records (the earliest known representatives of Cardiocraniinae and Dipodinae). Our results indicate that rodents originated around 61.7-62.4 Ma, shortly after the Cretaceous/Paleogene (K/Pg) boundary, and diversified at the intraordinal level around 57.7-58.9 Ma. These estimates are broadly consistent with the paleontological record, but challenge previous molecular studies that place the origin and early diversification of rodents in the Cretaceous. This study demonstrates that, with reliable fossil constraints, the incompatibility between paleontological and molecular estimates of rodent divergence times can be eliminated using currently available tools and genetic markers. Similar conflicts between molecular and paleontological evidence bedevil attempts to establish the origination times of other placental groups. The example of the present study suggests that more reliable fossil calibration points may represent the key to resolving these controversies.
format	article
author	Shaoyuan Wu Wenyu Wu Fuchun Zhang Jie Ye Xijun Ni Jimin Sun Scott V Edwards Jin Meng Chris L Organ
author_facet	Shaoyuan Wu Wenyu Wu Fuchun Zhang Jie Ye Xijun Ni Jimin Sun Scott V Edwards Jin Meng Chris L Organ
author_sort	Shaoyuan Wu
title	Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
title_short	Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
title_full	Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
title_fullStr	Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
title_full_unstemmed	Molecular and paleontological evidence for a post-Cretaceous origin of rodents.
title_sort	molecular and paleontological evidence for a post-cretaceous origin of rodents.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/5ac753a31f73499b9adb7cec31a1f377
work_keys_str_mv	AT shaoyuanwu molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT wenyuwu molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT fuchunzhang molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT jieye molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT xijunni molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT jiminsun molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT scottvedwards molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT jinmeng molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents AT chrislorgan molecularandpaleontologicalevidenceforapostcretaceousoriginofrodents
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Molecular and paleontological evidence for a post-Cretaceous origin of rodents.

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