英紙ネイチャーか米紙サイエンスにチンパンジーの遺伝子は人間とは全く違うと言うような論文が掲載された記憶があります

Pennisi E.

Evolutionary genetics. Jumbled DNA separates chimps and humans.

Science. 2002 Oct 25;298(5594):719-21.

PMID: 12399553

http://www.sciencemag.org/cgi/content/summary/298/5594/719b

また、ご質問の話題については、こちらのサイトで比較的詳しい解説がなされています。

（上記の記事も引用されています）

http://www.hannity.com/forum/showthread.php?t=7910

For almost 30 years, researchers have asserted that the DNA of humans and chimps is at least 98.5% identical. Now research reported here last week at the American Society for Human Genetics meeting suggests that the two primate genomes might not be quite as similar after all. A closer look has uncovered nips and tucks of homologous sections of DNA that weren’t noticed in previous studies (298:719, emp. added).

He compared 779,000 bases of chimp DNA with the sequences of the human genome, both found in the public repository GenBank. Single-base changes accounted for 1.4% of the differences between the human and chimp genomes, and insertions and deletions accounted for an additional 3.4%, he reported in the 15 October [2002] Proceedings of the National Academy of Sciences. Locke’s and Frazer’s groups didn’t commit to any new estimates of the similarity between the species, but both agree that the previously accepted 98.5% mark is too high (298:721, emp. added).

Science、Natureではないですが、こちらの文献もどうぞ。

Britten, Roy J. (2002), “Divergence between Samples of Chimpanzee and Human DNA Sequences is 5%, Counting Intels,” Proceedings of the National Academy of Sciences, 99:13633-13635, October 15.

既に基本的見解はコメントで書いておきましたが、一応関連しそうな論文をあげておきます。

Genetic evidence for complex speciation of humans and chimpanzees

Nick Patterson, Daniel J. Richter, Sante Gnerre, Eric S. Lander and David Reich

〈Nature, vol. 441, no. 7097 June 29, 2006　1103〉