| My man’s got a bad case of cystic fibrosis
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| A hella pessimistic prognosis
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| He started out like «why god, why god?
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| Why did that song have to shuffle on my iPod?»
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| Feelin' like he got struck with a left He did the sensible thing and read a
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| textbook
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| And discovered an inherited disease
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| That can only be understood evolutionarily
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| He’s got a gene called CFTR
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| With one deletion in a phenylalanine part
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| One less amino acid,
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| fantastic
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| Hell-a-common,
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| one in thirty white people have it
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| Carry one copy and you don’t even notice
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| Inherit two copies and catch a diagnosis
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| An autosomal recessive disorder,
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| one of more than
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| Four thousand genetic diseases recorded
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| And my man got the shorter side of the stick
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| So he started askin' questions like «why does it exist?»
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| What kind of sadistic joke is cystic fibrosis?
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| Now this is what he sings when he’s feelin' hopeless
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| I live my life,
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| I love my friends,
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| I eat my food
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| Sometimes I just don’t understand the things I do
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| A wise man told me:
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| «look deeper inside you»
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| So now I take the gene’s eye view |
| It turns out my man’s got a special mutation
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| That goes back more than six hundred generations
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| CFTR is just one of twenty thousand
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| Protein-coding genes that have been accounted
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| Knock one out and it makes a vast difference
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| He can’t breathe right,
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| and he’s got no vas deferens
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| That’s infertility without medical help
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| So how did this gene spread itself so well
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| That one in every thirty caucasian people have it?
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| He found the answer:
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| heterozygote advantage
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| Two copies gives you cystic fibrosis
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| One copy protects you from tuberculosis
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| Mendelian diseases can spread because carriers
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| Get resistance to parasites like various
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| Malarias, just check out thalassemia
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| It’s common in the tropics like sickle cell anemia
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| My man’s mutation protected his ancestors
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| In times of pandemic it spread and became prevalent
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| So evolution sacrificed him for his relatives
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| And now this is what he sings when he’s feelin' sick
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| I live my life,
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| I love my friends,
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| I eat my food
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| Sometimes I just don’t understand the things I do
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| A wise man told me: |
| «look deeper inside you»
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| So now I take the gene’s eye view
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| My man studied evolution up to his eyeballs
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| Until at least he could say
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| «hey, this isn’t my fault»
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| It’s all about trade offs and average benefits
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| Across populations;
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| sometimes it’s genetic drift
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| Or founder effects,
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| it’s not always adaptive
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| Sometimes mutations just randomly happen
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| Sex chromosomally x-linked recessives
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| Only affect men and yeah,
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| that’s kinda sexist
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| Some are autosomal dominant like Huntington’s
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| Which only kicks in after reproduction’s done
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| So selection can’t eliminate it
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| Maybe human ingenuity can though;
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| it’s innovative
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| Some disorders are so rare they’re orphaned
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| And never get a piece of the research portion
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| My man’s only one in three thousand
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| But in 2015 you can be one in three hundred thousand
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| And still be counted by patient advocates
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| Genetic research is takin' massive steps
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| My man’s gettin' hitched and family planning
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| With his new gene’s eye view understanding
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| I live my life,
|
| I love my friends,
|
| I eat my food
|
| Sometimes I just don’t understand the things I do |
| A wise man told me:
|
| «look deeper inside you»
|
| So now I take the gene’s eye view
|
| I live my life,
|
| I love my friends,
|
| I eat my food
|
| Sometimes I just don’t understand the things I do
|
| A wise man told me: «look deeper inside you»
|
| So now I take the gene’s eye view |