* Iran sanctions expected to tighten oil market
* But global markets ease on U.S.-China trade row
* China excludes U.S. crude from tariffs; uncertainty remains
* Trade disputes pulls down emerging market currencies
* Weaker currencies make dollar-traded oil more expensive (Adds currency concerns, comment, updates prices)
SINGAPORE, Aug 10 (Reuters) - Oil prices edged up on on Friday on worries that renewed U.S. sanctions against Iran will tighten supplies, although the escalating trade dispute between Washington and Beijing restricted gains.
Front-month Brent crude oil futures were at $72.21 per barrel at 0444 GMT, up 14 cents, or 0.2 percent from their last close.
U.S. West Texas Intermediate (WTI) crude futures were up by 6 cents at $66.87 a barrel.
Despite the possibility of a slowdown in economic growth due to escalating trade tensions, oil markets are for now relatively tight, analysts said, mostly because of sanctions on Iranian oil exports the United States plans to implement in November.
Although other powers, including the European Union, China and India oppose sanctions, many are expected to bow to American pressure.
"We do not believe that sanctions have been fully priced into Brent, leaving room for a significant run-up in prices towards the end of the year," BMI Research said.
Analysts expect the drop-off in Iranian crude exports to range between 500,000 barrels per day (bpd) and 1.3 million bpd, with buyers in Japan, South Korea and India already dialing back orders.
The reduction will depend on whether major buyers of Iranian oil in Asia receive sanctions waivers that would still allow some imports.
It was also not clear whether China, the biggest buyer of Iranian crude, will bow to Washington's pressure.
Beyond Iran sanctions, the escalating trade dispute between Washington and Beijing was weighing on global markets.
On a weekly basis, Brent is set for a 1.5 percent fall, while WTI is heading for a drop of around 2.5 percent.
"The market seems to be focused on fears of reduced demand from China, partially due to the effects of the trade wars between China and the United States," said William O'Loughlin, investment analyst at Australia's Rivkin Securities.
In the latest round, China said it would impose additional tariffs of 25 percent on $16 billion worth of U.S. imports.
Although crude was dropped off the list, replaced by refined products, many analysts say Chinese imports of American crude will still drop significantly.
"Already we are hearing that Chinese refiners are holding back on U.S. crude, despite escaping tariffs," ANZ bank said in a note on Friday.
Growing global trade tensions have also led to a slump in the currencies of major emerging economies such as India, Turkey and China.
These devaluations have made imports of oil, which is traded in U.S. dollars, more expensive, potentially denting demand.
"The major devaluation of many emerging market currencies relative to the U.S. dollar means that in local terms oil is higher than what we see on the screen," U.S. investment bank Jefferies said on Friday. (Reporting by Henning Gloystein in Singapore; Additional reporting by Gary McWilliams in Houston; Editing by Tom Hogue and Richard Pullin)