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It's no secret that naked mole-rats, wrinkled, nearly hairless rodents with long buck teeth protruding from their mouths, are not the most attractive animals on Earth. But what these creatures lack in beauty, they make up for in a miscellany of extraordinary characteristics that are intriguing zoologists and medical researchers around the world.
Found in the wild in Kenya, Ethiopia and Somalia, naked mole-rats live in colonies of around 70-80 members, with some home to as many as 300 animals. Highly social, these colonies are ruled by one queen and follow a strict hierarchy. Members oversee different jobs, such as those who bring back the underground parts of plants, such as bulbs, roots and tubers, which they eat, alongside faeces.
One of their most unique features is that it's hard to tell exactly how old a naked mole-rat is, as they show limited signs of physical decline. Whereas humans might become progressively wrinkled, grey, or more susceptible to chronic diseases, \"the standard signs of ageing you would expect to see in most mammals don't really seem to occur\", says Smith. There are no significant changes in cardiac function, body composition, bone quality or metabolism.
One experiment at the University of Cambridge saw researchers analyse 79 different cell lines, grown from the intestine, kidney, pancreas, lung and skin tissues of 11 individual naked mole-rats. Researchers infected the cells with modified viruses to introduce cancer-causing genes. To their surprise, the infected naked mole-rats cells began to multiply rapidly. This confirmed that it's the environment of the naked mole-rat's body that prevents cancer from developing, rather than a cell-level trait.
The jury may still be out, but what we do know is that \"cancer is fundamentally the result of a mutation, which causes cells to proliferate in an uncontrolled manner\", says Smith. \"Compared to lots of other species, naked mole-rats have very slow mutation rates.\" Animals with shorter lifespans typically have faster mutation rates but, unusually, mole-rats' mutation rates are on the same level as those of longer-lived mammals, such as giraffes. A slower mutation rate means the animal is less likely to develop mutations and get cancer in a given period of time.
Perhaps the strangest of the naked mole-rat's quirks is that it is impervious to pain. \"This is probably a result of evolutionary adaptation to [their] high carbon dioxide environment,\" explains Smith.
In many inflammatory diseases, such as rheumatoid arthritis, the areas of tissue swelling can often become acidic and can cause pain. Yet, \"the naked mole-rat doesn't feel acid as being painful, not in the way that lemon juice or vinegar splashed over cut skin feels painful\", says Smith.
Alongside the Damaraland mole rat, naked mole-rats are one of only two examples of eusocial mammals that live in colonies of overlapping generations where only one female is responsible for breeding and the rest work together to raise the brood.
Usually, there is one fertile pair per colony and the rest of the animals don't go through puberty, Helfer explains. However, if a naked mole-rat is removed from its colony, it will promptly start making sex steroids and the animal experiences puberty.
''Humans have a long phase of pre-puberty of around eight to 12 years,'' she says. ''When a child goes into puberty this triggers hormones in the brain, which lead to the production of sex hormones and allows the reproductive tract to mature.'' This mirrors the progression of puberty among naked mole-rats when subordinate females are isolated from the queen (the dominant female) in a colony.
In contrast, mice and rats go through puberty particularly quickly, within two weeks of birth, so they are a poor template for studying sex hormones. Helfer and other scientists are increasingly looking to naked mole-rats to investigate the influence of sex hormones, specifically oestrogen and testosterone, and sex chromosomes.
The naked mole-rats Helfer keeps at Bradford University fascinate her due to their ''incredible intelligence'' and a few ''bonkers'' habits. Inside their highly organised colonies, they have nesting chambers for sleeping and toilet rooms for keeping their habitats clean, she says. When pups were born, she was stunned to see the colony had created a \"nursery\", for rearing young naked mole-rats.
Another way naked mole-rats cooperate as a colony is through sustainable farming. Meal times involve bringing back large tubers such as sweet potatoes to their burrows, with each meal weighing up to 50kg (110lb), to gnaw at with other members of the colony. The mole-rats remove the poisonous outer layers of the plant, eat their meal, and then plug the regions they have eaten with soil, allowing the tuber to regenerate and become another meal down the line.
As biologically mind-boggling as naked mole-rats are, they aren't the simplest species to look after and work with, meaning that relatively few research groups worldwide study this incredible species.
Smith's naked-mole rat colony, if they live to their natural age, are likely to transcend his career. \"Very few people in the world have lots of naked mole-rats aged over 30 years. For example, the animals that were born in my colonies last week won't reach their maximum life span until after I've retired,\" he says.
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Technical Abstract: Li-2 is a monogenic, dominant mutant characterized by only short fuzz fibers on mature seeds in cotton. We observed an abnormal phenotype associated with Li-2 with individual plants with branches producing different types of fibers in the same plant. We used Li-2 in partial diallel crosses with FM 966 (normal seeds with both lint and fuzz fibers), MD17 (an USA fiberless line), 177 (another Chinese fiberless line), and 181 (naked seed with only lint fiber line). We did not observe the abnormal phenotypes among the crosses with any other genotypes except Li-2 suggesting the presence of a novel allele in Li-2 causing this abnormal phenotype. We also observed different proportions of such abnormal phenotype in different generations (F1, F2, BC1F1) among the crosses of Li-2. We detected the following proportion of abnormal plants with seeds producing different types of fibers in different branches of the same plant: Li-2 (22%), FM966 x Li-2 (F1 42%, F2 1%, BC1F1 5%), MD17 x Li-2 (F1 38%, F2 2%, BC1F1 0.4%), 177 x Li-2 (F1 33%, F2 2%, BC1F1 2%), and 181 x Li-2 (F1 40%, F2 1%, BC1F1 3%). We observed this abnormal phenotype in both field and greenhouse conditions. This abnormal phenotype could be caused by different genetic effects including low penetrance or a tansposable element or some other cytogenetic abnormalities. 59ce067264
https://sr.therapieplatz-jetzt.org/forum/fragen-antworten/s2e2-a-smith-in-the-hand