M 1 1 9 ▁and ▁the ▁Han ▁Chinese ▁populations ▁of ▁southern ▁China , ▁as ▁well ▁as ▁between ▁this ▁ha p lo group ▁and ▁the ▁Tai – K ada i - spe aking ▁populations ▁of ▁southern ▁China ▁and ▁S out heast ▁Asia . ▁The ▁distribution ▁of ▁Tai – K ada i ▁languages ▁in ▁Th ailand ▁and ▁other ▁parts ▁of ▁S out heast ▁Asia ▁outside ▁of ▁China ▁has ▁long ▁been ▁believed , ▁for ▁reasons ▁of ▁traditional ▁lingu istic ▁ge ography , ▁to ▁reflect ▁a ▁recent ▁invasion ▁of ▁S out heast ▁Asia ▁by ▁Tai – K ada i - spe aking ▁populations ▁origin ating ▁from ▁sout he astern ▁China , ▁and ▁the ▁somewhat ▁elev ated ▁frequency ▁of ▁H ap lo group ▁O - M 1 1 9 ▁among ▁the ▁Tai – K ada i ▁populations , ▁couple d ▁with ▁a ▁high ▁frequency ▁of ▁H ap lo group ▁O - M 9 5 , ▁which ▁is ▁a ▁gen etic ▁characteristic ▁of ▁the ▁Aust ro asi atic - spe aking ▁pe op les ▁of ▁S out heast ▁Asia , ▁suggests ▁that ▁the ▁gen etic ▁signature ▁of ▁the ▁Tai – K ada i ▁pe op les ' ▁aff inity ▁with ▁populations ▁of ▁sout he astern ▁China ▁has ▁been ▁weak ened ▁due ▁to ▁extensive ▁assim ilation ▁of ▁the ▁earlier ▁Aust ro asi atic ▁residents ▁of ▁the ▁lands ▁which ▁the ▁Tai – K ada i ▁pe op les ▁inv aded . ▁Also , ▁it ▁has ▁been ▁noted ▁that ▁H ap lo group ▁O - M 1 1 9 ▁line ages ▁among