TY - CHAP

T1 - From the twig tips to the deeper branches

T2 - new insights into evolutionary history and phylogeography of Ascaris

AU - Betson, Martha

AU - Nejsum, Peter

AU - Stothard, J. Russell

PY - 2013

Y1 - 2013

N2 - To better understand the epidemiology of ascariasis, molecular genetic methods have been applied to differentiate between worms found infecting people and pigs, and other occasional hosts. Owing to difficulties in applying species concepts, the longstanding debate of the distinction(s) between Ascaris lumbricoides and Ascaris suum continues. From an applied perspective, however, molecular markers help to "tag" and "track" worms during their transmission cycle(s), providing new insights into host range, as well as methods for assessing parasite population dynamics through time and contingent upon disease control. While useful in determining dynamics at the tips of the evolutionary tree, these molecular tools also provide insights into deeper evolutionary branches. Although Ascaris is found throughout the globe, molecular analysis of worms retrieved from sub-Saharan Africa point towards a significant center of genetic diversity, possibly denoting a likely center of evolutionary origin with subsequent parasite diaspora. Resolving these issues precisely, however, requires greater scrutiny of genetic variation within Parascaris and Baylisascaris. © 2013

AB - To better understand the epidemiology of ascariasis, molecular genetic methods have been applied to differentiate between worms found infecting people and pigs, and other occasional hosts. Owing to difficulties in applying species concepts, the longstanding debate of the distinction(s) between Ascaris lumbricoides and Ascaris suum continues. From an applied perspective, however, molecular markers help to "tag" and "track" worms during their transmission cycle(s), providing new insights into host range, as well as methods for assessing parasite population dynamics through time and contingent upon disease control. While useful in determining dynamics at the tips of the evolutionary tree, these molecular tools also provide insights into deeper evolutionary branches. Although Ascaris is found throughout the globe, molecular analysis of worms retrieved from sub-Saharan Africa point towards a significant center of genetic diversity, possibly denoting a likely center of evolutionary origin with subsequent parasite diaspora. Resolving these issues precisely, however, requires greater scrutiny of genetic variation within Parascaris and Baylisascaris. © 2013

UR - http://www.scopus.com/inward/record.url?scp=84882585741&partnerID=8YFLogxK

U2 - 10.1016/B978-0-12-396978-1.00010-0

DO - 10.1016/B978-0-12-396978-1.00010-0

M3 - Book chapter

AN - SCOPUS:84882585741

SN - 9780123969781

SP - 265

EP - 285

BT - Ascaris

A2 - Holland, Celia

PB - Elsevier

ER -