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Molecular evolution of feathers from fossils

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  • Molecular evolution of feathers from fossils

    As revealed in previous threads of mine, scales, hair and feathers have a common evolutionary origin.as do mammary glands. This paper and a few others help elucidate the molecular evolution of feathers. Specifically looking to seen when feathers - rather the keratin - changed to accommodate flight. They find the Anchiornis had both alpha and beta keratin. Modern birds are mostly populated by beta.


    The molecular evolution of feathers with direct evidence from fossils

    Significance


    During the dinosaur–bird transition, feathers of bird ancestors must have been molecularly modified to become biomechanically suitable for flight. We report molecular moieties in fossil feathers that shed light on that transition. Pennaceous feathers attached to the right forelimb of the Jurassic dinosaur Anchiornis were composed of both feather β-keratins and α-keratins, but were dominated by α-keratins, unlike mature feathers of extant birds, which are dominated by β-keratins. Data suggest that the pennaceous feathers of Anchiornis had some, but not all, of the ultrastructural and molecular characteristics of extant feathers, and may not yet have attained molecular modifications required for powered flight. Abstract


    Dinosaur fossils possessing integumentary appendages of various morphologies, interpreted as feathers, have greatly enhanced our understanding of the evolutionary link between birds and dinosaurs, as well as the origins of feathers and avian flight. In extant birds, the unique expression and amino acid composition of proteins in mature feathers have been shown to determine their biomechanical properties, such as hardness, resilience, and plasticity. Here, we provide molecular and ultrastructural evidence that the pennaceous feathers of the Jurassic nonavian dinosaur Anchiornis were composed of both feather β-keratins and α-keratins. This is significant, because mature feathers in extant birds are dominated by β-keratins, particularly in the barbs and barbules forming the vane. We confirm here that feathers were modified at both molecular and morphological levels to obtain the biomechanical properties for flight during the dinosaur–bird transition, and we show that the patterns and timing of adaptive change at the molecular level can be directly addressed in exceptionally preserved fossils in deep time.
    "Kids & Adults love Fairy Tale Ark exhibit" - Ken Ham

  • #2
    All of that seems totally dependent on thinking a unproven theory is true; a theory, btw, which has been proven false many times, and the theory keeps changing every time it is proven false, trying to 'stay' around....

    Comment


    • #3
      Ignoring the nonsense.

      As revealed in previous threads of mine, scales, hair and feathers have a common evolutionary origin.as do mammary glands. This paper and a few others help elucidate the molecular evolution of feathers. Specifically looking to seen when feathers - rather the keratin - changed to accommodate flight. They find the Anchiornis had both alpha and beta keratin. Modern birds are mostly populated by beta.


      The molecular evolution of feathers with direct evidence from fossils

      Significance


      During the dinosaur–bird transition, feathers of bird ancestors must have been molecularly modified to become biomechanically suitable for flight. We report molecular moieties in fossil feathers that shed light on that transition. Pennaceous feathers attached to the right forelimb of the Jurassic dinosaur Anchiornis were composed of both feather β-keratins and α-keratins, but were dominated by α-keratins, unlike mature feathers of extant birds, which are dominated by β-keratins. Data suggest that the pennaceous feathers of Anchiornis had some, but not all, of the ultrastructural and molecular characteristics of extant feathers, and may not yet have attained molecular modifications required for powered flight. Abstract


      Dinosaur fossils possessing integumentary appendages of various morphologies, interpreted as feathers, have greatly enhanced our understanding of the evolutionary link between birds and dinosaurs, as well as the origins of feathers and avian flight. In extant birds, the unique expression and amino acid composition of proteins in mature feathers have been shown to determine their biomechanical properties, such as hardness, resilience, and plasticity. Here, we provide molecular and ultrastructural evidence that the pennaceous feathers of the Jurassic nonavian dinosaur Anchiornis were composed of both feather β-keratins and α-keratins. This is significant, because mature feathers in extant birds are dominated by β-keratins, particularly in the barbs and barbules forming the vane. We confirm here that feathers were modified at both molecular and morphological levels to obtain the biomechanical properties for flight during the dinosaur–bird transition, and we show that the patterns and timing of adaptive change at the molecular level can be directly addressed in exceptionally preserved fossils in deep time.
      "Kids & Adults love Fairy Tale Ark exhibit" - Ken Ham

      Comment


      • #4
        Originally posted by Promethean View Post
        Ignoring the nonsense.

        As revealed in previous threads of mine, scales, hair and feathers have a common evolutionary origin.as do mammary glands. This paper and a few others help elucidate the molecular evolution of feathers. Specifically looking to seen when feathers - rather the keratin - changed to accommodate flight. They find the Anchiornis had both alpha and beta keratin. Modern birds are mostly populated by beta.


        The molecular evolution of feathers with direct evidence from fossils

        Significance


        During the dinosaur–bird transition, feathers of bird ancestors must have been molecularly modified to become biomechanically suitable for flight. We report molecular moieties in fossil feathers that shed light on that transition. Pennaceous feathers attached to the right forelimb of the Jurassic dinosaur Anchiornis were composed of both feather β-keratins and α-keratins, but were dominated by α-keratins, unlike mature feathers of extant birds, which are dominated by β-keratins. Data suggest that the pennaceous feathers of Anchiornis had some, but not all, of the ultrastructural and molecular characteristics of extant feathers, and may not yet have attained molecular modifications required for powered flight. Abstract


        Dinosaur fossils possessing integumentary appendages of various morphologies, interpreted as feathers, have greatly enhanced our understanding of the evolutionary link between birds and dinosaurs, as well as the origins of feathers and avian flight. In extant birds, the unique expression and amino acid composition of proteins in mature feathers have been shown to determine their biomechanical properties, such as hardness, resilience, and plasticity. Here, we provide molecular and ultrastructural evidence that the pennaceous feathers of the Jurassic nonavian dinosaur Anchiornis were composed of both feather β-keratins and α-keratins. This is significant, because mature feathers in extant birds are dominated by β-keratins, particularly in the barbs and barbules forming the vane. We confirm here that feathers were modified at both molecular and morphological levels to obtain the biomechanical properties for flight during the dinosaur–bird transition, and we show that the patterns and timing of adaptive change at the molecular level can be directly addressed in exceptionally preserved fossils in deep time.
        Shubin goes into detail about this in Your Inner Fish.
        When evil is powerful, good men are silenced.

        Comment


        • #5
          Originally posted by Jethro77 View Post
          All of that seems totally dependent on thinking a unproven theory is true; a theory, btw, which has been proven false many times, and the theory keeps changing every time it is proven false, trying to 'stay' around....
          Nope. Not even close.
          When evil is powerful, good men are silenced.

          Comment


          • #6
            Originally posted by Jethro77 View Post
            All of that seems totally dependent on thinking a unproven theory is true; a theory, btw, which has been proven false many times, and the theory keeps changing every time it is proven false, trying to 'stay' around....
            Show just one example please.

            With all the conflicting religious beliefs in the world, they can’t all be right. But they can all be wrong.
            Herb Silverman.

            Comment


            • #7
              Good article.

              Here is another news article showing the close association between the scales of reptiles and feathers of birds. Both reptiles and birds descended from a common ancestor.

              ”Researchers from the University of Southern California analysed the complete DNA of developing chicks and alligators to identify differences in key genes involved in scale or feather formation.

              They placed these unique chicken feather genes within alligator eggs, carefully turning them on or off underneath their growing skin to reawaken an ancient programming that can turn scales into feathers.

              Professor Cheng-Ming Choung, lead author of the study, said: 'We now have a potential molecular explanation for these hypothesised missing links.'

              https://www.dailymail.co.uk/sciencet...-feathers.html


              We shall not injure God by remaining ignorant of Him, but shall deprive ourselves of His friendship.

              Comment


              • #8
                Originally posted by docphin View Post
                Good article.

                Here is another news article showing the close association between the scales of reptiles and feathers of birds. Both reptiles and birds descended from a common ancestor.

                ”Researchers from the University of Southern California analysed the complete DNA of developing chicks and alligators to identify differences in key genes involved in scale or feather formation.

                They placed these unique chicken feather genes within alligator eggs, carefully turning them on or off underneath their growing skin to reawaken an ancient programming that can turn scales into feathers.

                Professor Cheng-Ming Choung, lead author of the study, said: 'We now have a potential molecular explanation for these hypothesised missing links.'

                https://www.dailymail.co.uk/sciencet...-feathers.html

                A fabulators delight.

                Weasel words.

                We want a demonstration. Not speculation.

                Your post shows complete failure.

                God doesn't believe such flagrant speculation.

                Comment


                • #9
                  Originally posted by Nouveau View Post

                  A fabulators delight.

                  Weasel words.
                  Hey Scientist Nouveau, tell everyone how you determined the "Ph" of ocean water.

                  Originally posted by Nouveau View Post
                  I ask you again what the Ph is of the ocean and it is clear you are not educated enough to understand the question.
                  Last edited by Tim H; 01-31-19, 11:33 PM.
                  "Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science." - Charles Darwin

                  Comment


                  • #10
                    Originally posted by Tim H View Post

                    Hey Scientist Nouveau, tell everyone how you determined the "Ph" of ocean water.



                    he used his hard earned pHd

                    "Kids & Adults love Fairy Tale Ark exhibit" - Ken Ham

                    Comment


                    • #11
                      Originally posted by Nouveau View Post

                      God doesn't believe such flagrant speculation.
                      Listen to nouveau:

                      We want a demonstration of your god. Not speculation.

                      Your post shows complete failure.

                      "Kids & Adults love Fairy Tale Ark exhibit" - Ken Ham

                      Comment


                      • #12
                        Feathers from nonfeathered involves an increase in information. It does not involve activation of information already there. So what would be the natural source of the increase in information for the appearance of feathers even if happening via small steps?
                        Last edited by lightbeamrider; 02-01-19, 01:16 AM.

                        Comment


                        • #13
                          Originally posted by lightbeamrider View Post
                          Feathers from nonfeathered involves an increase in information. It does not involve activation of information already there. So what would be the natural source of the increase in information for the appearance of feathers even if happening via small steps?
                          mutations.
                          When evil is powerful, good men are silenced.

                          Comment


                          • #14
                            Originally posted by D Laurier View Post

                            mutations.
                            mutation goddess

                            Comment


                            • #15
                              Originally posted by Nouveau View Post

                              mutation goddess
                              Please support the notion that your "mutation goddess" exists
                              When evil is powerful, good men are silenced.

                              Comment

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