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Plants and animals sometimes take genes from bacteria study of algae suggests

first_img Plants and animals sometimes take genes from bacteria, study of algae suggests Debashish Bhattacharya Email By Elizabeth PennisiJan. 29, 2019 , 4:45 PM Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe In 2015, after analyses of millions of protein sequences across many species, William Martin, a biologist at the University of Dusseldorf (UD) in Germany, and colleagues concluded in Nature that there is no significant ongoing transfer of prokaryotic genes into eukaryotes. Martin believes any such transfers only occurred episodically early in the evolution of eukaryotes, as they internalized the bacteria that eventually became organelles such mitochondria or chloroplasts. If bacterial genes were continually moving into eukaryotes and being put to use, Martin says, a pattern of such gene accumulation should be discernible within the eukaryotic family tree, but there is none.Debashish Bhattacharya, an evolutionary genomicist at Rutgers University in New Brunswick, New Jersey, and UD plant biochemist Andreas Weber took a closer look at a possible case of bacteria-to-eukaryote gene transfer that Martin has challenged. The initial sequencing of genomes from two species of red algae called Cyanidiophyceae had indicated that up to 6% of their DNA had a prokaryotic origin. These so-called extremophiles, which live in acidic hot springs and even inside rock, can’t afford to maintain superfluous DNA. They appear to contain only genes needed for survival. “When we find a bacterial gene, we know it has an important function or it wouldn’t last” in the genome, Bhattacharya says.He and Weber turned to a newer technology that deciphers long pieces of DNA. The 13 red algal genomes they studied contain 96 foreign genes, nearly all of them sandwiched between typical algal genes in the DNA sequenced, which makes it unlikely they were accidentally introduced in the lab. “At the very least, this argument that [putative transferred genes are] all contamination should finally be obsolete,” says Gerald Schoenknecht, a plant physiologist at Oklahoma State University in Stillwater.The transferred genes seem to transport or detoxify heavy metals, or they help the algae extract nourishment from the environment or cope with high temperature and other stressful conditions. “By acquiring genes from extremophile prokaryotes, these red algae have adapted to more and more extreme environments,” Schoenknecht says. Martin says the new evidence doesn’t persuade him. “They go to great lengths to find exactly what I say they should find if [horizontal gene transfer to eukaryotes] is real, but they do not find it,” he asserts. Others argue that gene transfer to eukaryotes is so rare, and the pressure to get rid of any but the most important borrowed genes is so strong, that transferred genes might not accumulate over time as Martin expects.Of course, Roger says, “What’s happening in red algae might not be happening in animals like us.” Humans and all other multicellular eukaryotes, including plants, have specialized reproductive cells, such as sperm or eggs or their stem cells, and only bacterial genes picked up by those cells could be passed on.Despite this obstacle, several insect researchers say they see evidence of such gene transfer. John McCutcheon, a biologist at Montana State University in Missoula who studies mealy bugs, is one. “I’ve moved beyond asking ‘if [the bacterial genes] are there,’ to how they work,” he says. The red algae, he adds, “is a very clear case.”center_img Algae found in thermal springs and other extreme environments have heated up a long-standing debate: Do eukaryotes—organisms with a cell nucleus—sometimes get an evolutionary boost in the form of genes transferred from bacteria? The genomes of some red algae, single-celled eukaryotes, suggest the answer is yes. About 1% of their genes have foreign origins, and the borrowed genes may help the algae adapt to their hostile environment.The new research, posted last week as a preprint on bioRxiv, has not persuaded the most vocal critic of the idea that eukaryotes regularly receive beneficial bacterial DNA. But other scientists have been won over. The group provides a “fairly nice, rock-solid case for horizontal gene transfer” into eukaryotes, says Andrew Roger, a protist genomicist at Dalhousie University in Halifax, Canada.Many genome studies have shown that prokaryotes—bacteria and archaea—liberally swap genes among species, which influences their evolution. The initial sequencing of the human genome suggested our species, too, has picked up microbial genes. But further work demonstrated that such genes found in vertebrate genomes were often contaminants introduced during sequencing. Sign up for our daily newsletter Get more great content like this delivered right to you! Country To thrive in extreme environments like thermal springs, unicellular red algae (green) have taken in bacteria genes. Click to view the privacy policy. Required fields are indicated by an asterisk (*)last_img read more

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