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{{short description|Control of growth and differentiation processes by deeply conserved genetic mechanisms}}
{{short description|Control of growth and differentiation by deeply conserved genetic mechanisms}}
[[File:PAX6 Phenotypes Washington etal PLoSBiol e1000247.png|right|400px|thumb|''[[pax6]]'' alterations result in similar phenotypic alterations of eye morphology and function across a wide range of species.]]
[[File:PAX6 Phenotypes Washington etal PLoSBiol e1000247.png|right|400px|thumb|''[[pax6]]'' alterations result in similar phenotypic alterations of eye morphology and function across a wide range of species.]]


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{{further|Evolutionary developmental biology}}
{{further|Evolutionary developmental biology}}


In 1822, the French zoologist [[Étienne Geoffroy Saint-Hilaire]] dissected a [[crayfish]], discovering that its body is organised like a vertebrate's, but [[Inversion (evolutionary biology)|inverted belly to back (dorsoventrally)]]:<ref name=Held2>{{cite book |last1=Held |first1=Lewis I. |authorlink=Lewis Held |title=Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo |date=February 2017 |publisher=Cambridge University Press |isbn=978-1316601211 |pages=2–5}}</ref>
In 1822, the French zoologist [[Étienne Geoffroy Saint-Hilaire]] dissected a [[crayfish]], discovering that its body is organised like a vertebrate's, but [[Inversion (evolutionary biology)|inverted belly to back (dorsoventrally)]]:<ref name=Held2>{{cite book |last1=Held |first1=Lewis I. |author-link=Lewis Held |title=Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo |date=February 2017 |publisher=Cambridge University Press |isbn=978-1316601211 |pages=2–5}}</ref>


{{quote|I just found that all the soft organs, that is to say, the principal organs of life are found in crustaceans, and so in insects, in the same order, in the same relationships and with the same arrangement as their analogues in the high vertebrate animals ... What was my surprise, and I may add, my admiration, seeing [such] a rule ...<ref name=Held2/>}}
{{blockquote|I just found that all the soft organs, that is to say, the principal organs of life are found in crustaceans, and so in insects, in the same order, in the same relationships and with the same arrangement as their analogues in the high vertebrate animals ... What was my surprise, and I may add, my admiration, seeing [such] a rule ...<ref name=Held2/>}}


[[File:Genes hox.jpeg|thumb|upright=1.35|[[Homology (biology)|Homologous]] [[hox gene|''hox'' genes]] in such different animals as [[insect]]s and [[vertebrate]]s control [[embryogenesis|embryonic development]] and hence the [[Morphology (biology)|form]] of adult bodies. These genes have been [[conserved sequence|highly conserved]] through hundreds of millions of years of [[evolution]].]]
[[File:Genes hox.jpeg|thumb|upright=1.35|[[Homology (biology)|Homologous]] [[hox gene|''hox'' genes]] in such different animals as [[insect]]s and [[vertebrate]]s control [[embryogenesis|embryonic development]] and hence the [[Morphology (biology)|form]] of adult bodies. These genes have been [[conserved sequence|highly conserved]] through hundreds of millions of years of [[evolution]].]]
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Geoffroy's homology theory was denounced by the leading French zoologist of his day, [[Georges Cuvier]], but in 1994, Geoffroy was shown to be correct.<ref name=Held2/> In 1915, [[Santiago Ramon y Cajal]] mapped the neural connections of the optic lobes of a fly, finding that these resembled those of vertebrates.<ref name=Held2/> In 1978, [[Edward B. Lewis]] helped to found [[evolutionary developmental biology]], discovering that [[homeosis|homeotic genes]] regulated embryonic development in fruit flies.<ref name=Held2/>
Geoffroy's homology theory was denounced by the leading French zoologist of his day, [[Georges Cuvier]], but in 1994, Geoffroy was shown to be correct.<ref name=Held2/> In 1915, [[Santiago Ramon y Cajal]] mapped the neural connections of the optic lobes of a fly, finding that these resembled those of vertebrates.<ref name=Held2/> In 1978, [[Edward B. Lewis]] helped to found [[evolutionary developmental biology]], discovering that [[homeosis|homeotic genes]] regulated embryonic development in fruit flies.<ref name=Held2/>


In 1997, the term deep homology first appeared in a paper by [[Neil Shubin]], Cliff Tabin, and [[Sean B. Carroll]], describing the apparent relatedness in genetic regulatory apparatuses which indicated evolutionary similarities in disparate animal features.<ref name="Shubin Tabin Carroll 1997">{{cite journal | last=Shubin | first=Neil | last2=Tabin | first2=Cliff | last3=Carroll | first3=Sean | title=Fossils, genes and the evolution of animal limbs | journal=Nature | publisher=Springer Nature | volume=388 | issue=6643 | year=1997 | doi=10.1038/41710 | pages=639–648 | url=https://pdfs.semanticscholar.org/e9fd/04bdfae57145375564321602c405bb0cbaa4.pdf}}</ref>
In 1997, the term deep homology first appeared in a paper by [[Neil Shubin]], Cliff Tabin, and [[Sean B. Carroll]], describing the apparent relatedness in genetic regulatory apparatuses which indicated evolutionary similarities in disparate animal features.<ref name="Shubin Tabin Carroll 1997">{{cite journal | last1=Shubin | first1=Neil | last2=Tabin | first2=Cliff | last3=Carroll | first3=Sean | s2cid=2913898 | title=Fossils, genes and the evolution of animal limbs | journal=Nature | publisher=Springer Nature | volume=388 | issue=6643 | year=1997 | doi=10.1038/41710 | pages=639–648 | pmid=9262397| bibcode=1997Natur.388..639S | doi-access=free }}</ref>


==A different kind of homology==
==Difference from ordinary homology==


Whereas ordinary [[homology (biology)|homology]] is seen in the pattern of structures such as limb bones of mammals that are evidently related, deep homology can apply to groups of animals that have quite dissimilar anatomy: vertebrates (with [[endoskeleton]]s made of [[bone]] and [[cartilage]]) and arthropods (with [[exoskeleton]]s made of [[chitin]]) nevertheless have limbs that are constructed using similar recipes or "algorithms".<ref name="Shubin Tabin Carroll 1997"/><ref name=Carroll66>{{cite book |last=Carroll |first=Sean B. |authorlink=Sean B. Carroll |title=Endless Forms Most Beautiful |titlelink=Endless Forms Most Beautiful (book) |date=2006 |publisher=Weidenfeld & Nicolson |isbn=0-297-85094-6 |pages=28, 66–69}}</ref><ref>{{cite book |chapter=Homologous Pathways of Development |chapterurl=https://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=dbio&part=A5439 |author=Gilbert, Scott F. |authorlink=Scott F. Gilbert |title=Developmental biology |publisher=Sinauer Associates |location=Sunderland, Mass |year=2000 |pages= |isbn=0-87893-243-7 |edition=6th |url=https://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=dbio}}</ref><ref>{{cite book |last1=Held |first1=Lewis I. |authorlink=Lewis Held |title=Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo |date=February 2017 |publisher=Cambridge University Press |isbn=978-1316601211 |pages=viii and throughout}}</ref>
Whereas ordinary [[homology (biology)|homology]] is seen in the pattern of structures such as limb bones of mammals that are evidently related, deep homology can apply to groups of animals that have quite dissimilar anatomy: vertebrates (with [[endoskeleton]]s made of [[bone]] and [[cartilage]]) and arthropods (with [[exoskeleton]]s made of [[chitin]]) nevertheless have limbs that are constructed using similar recipes or "algorithms".<ref name="Shubin Tabin Carroll 1997"/><ref name=Carroll66>{{cite book |last=Carroll |first=Sean B. |author-link=Sean B. Carroll |title=Endless Forms Most Beautiful |title-link=Endless Forms Most Beautiful (book) |date=2006 |publisher=Weidenfeld & Nicolson |isbn=0-297-85094-6 |pages=28, 66–69}}</ref><ref>{{cite book |chapter=Homologous Pathways of Development |chapter-url=https://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=dbio&part=A5439 |author=Gilbert, Scott F. |author-link=Scott F. Gilbert |title=Developmental biology |publisher=Sinauer Associates |location=Sunderland, Mass |year=2000 |isbn=0-87893-243-7 |edition=6th |url=https://archive.org/details/developmentalbio00gilb |url-access=registration }}</ref><ref>{{cite book |last1=Held |first1=Lewis I. |author-link=Lewis Held |title=Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo |date=February 2017 |publisher=Cambridge University Press |isbn=978-1316601211 |pages=viii and throughout}}</ref>


Within the [[metazoa]], [[homeotic gene]]s control differentiation along major [[body axis|body axes]], and [[pax genes]] (especially [[PAX6]]) help to control the development of the [[eye]] and other [[sensory organ]]s. The deep homology applies across widely separated groups, such as in the eyes of [[mammals]] and the structurally quite different [[compound eye]]s of [[insects]].<ref name=Carroll66/>
Within the [[metazoa]], [[homeotic gene]]s control differentiation along major [[body axis|body axes]], and [[pax genes]] (especially [[PAX6]]) help to control the development of the [[eye]] and other [[sensory organ]]s. The deep homology applies across widely separated groups, such as in the eyes of [[mammals]] and the structurally quite different [[compound eye]]s of [[insects]].<ref name=Carroll66/>


Similarly, [[hox gene]]s help to form an animal's segmentation pattern. HoxA and HoxD, that regulate finger and toe formation in mice, control the development of [[Actinopterygii|ray fins]] in [[zebrafish]]; these structures had until then been considered non-homologous.<ref>{{Cite news |url=https://www.nytimes.com/2016/08/18/science/from-fins-into-hands-scientists-discover-a-deep-evolutionary-link.html |title=From Fins Into Hands: Scientists Discover a Deep Evolutionary Link |last=Zimmer |first=Carl |authorlink=Carl Zimmer|date=2016-08-17 |newspaper=[[The New York Times]] |access-date=21 October 2016}}</ref>
Similarly, [[hox gene]]s help to form an animal's segmentation pattern. HoxA and HoxD, that regulate finger and toe formation in mice, control the development of [[Actinopterygii|ray fins]] in [[zebrafish]]; these structures had until then been considered non-homologous.<ref>{{Cite news |url=https://www.nytimes.com/2016/08/18/science/from-fins-into-hands-scientists-discover-a-deep-evolutionary-link.html |title=From Fins Into Hands: Scientists Discover a Deep Evolutionary Link |last=Zimmer |first=Carl |author-link=Carl Zimmer|date=2016-08-17 |newspaper=[[The New York Times]] |access-date=21 October 2016}}</ref>


There is a possible deep homology among animals that use acoustic communication, such as songbirds and humans, which may share unmutated versions of the [[FOXP2]] gene.<ref>{{cite journal |title=Evo-Devo, Deep Homology and FoxP2: Implications for the Evolution of Speech and Language |author1=Scharff, Petri |author2=Constance, Jane |journal=Philos. Trans. Royal Soc. B |date=July 2011 |volume=366 |issue=1574 |pages=2124–2140 |doi=10.1098/rstb.2011.0001|pmc=3130369 }}</ref>
There is a possible deep homology among animals that use acoustic communication, such as songbirds and humans, which may share functional versions of the [[FOXP2]] gene.<ref>{{cite journal |title=Evo-Devo, Deep Homology and FoxP2: Implications for the Evolution of Speech and Language |author1=Scharff, Petri |author2=Constance, Jane |journal=Philos. Trans. R. Soc. B |date=July 2011 |volume=366 |issue=1574 |pages=2124–2140 |doi=10.1098/rstb.2011.0001|pmc=3130369 |pmid=21690130}}</ref>


== In cancer stem cells ==
⚫
==Algorithm==
In modern day [[biology]], the depth of understanding deep homology has evolved into focusing on the [[Molecular biology|molecular]] and [[Genetics|genetic mechanisms]] and functions rather than simple [[Morphology (biology)|morphology]]. [[Cancer stem cell]]s (CSCs) are a population of cells within a tumor that have the ability to self-renew and differentiate into different cell types, similar to normal [[stem cell]]s. The stem cell theory of cancer suggests that there is a subpopulation of cells, referred to as cancer stem cells, that have certain characteristics that make them unique among other types of cells within a cancer. The traits that are included in CSCs are that they multiply indefinitely, are resistant to [[chemotherapy]], and are proposed to be responsible for relapse after therapy.<ref>{{Cite web |title=Department of Cancer Biology - Cancer Stem Cells |url=https://www.mayo.edu/research/departments-divisions/department-cancer-biology/research/cancer-stem-cells |access-date=2023-04-10 |website=Mayo Clinic |language=en}}</ref>


=== Life cycle of cancer ===
⚫
In 2010, a team led by [[Edward Marcotte]] developed an [[algorithm]] that identifies deeply homologous genetic modules in unicellular organisms, plants, and animals based on [[phenotype]]s (such as traits and developmental defects). The technique aligns phenotypes across organisms based on [[Homology (biology)#Orthology|orthology]] (a type of homology) of genes involved in the phenotypes.<ref>{{cite news |author=Zimmer, Carl |authorlink=Carl Zimmer |url=https://www.nytimes.com/2010/04/27/science/27gene.html?hp=&pagewanted=all |title=The Search for Genes Leads to Unexpected Places |work=The New York Times |date=April 26, 2010}}</ref><ref name="McGary2010">{{cite journal |author1=McGary, K. L. |author2=Park, T. J. |author3=Woods, J. O. |author4=Cha, H. J. |author5=Wallingford, J. B. |author6=Marcotte, E. M. |authorlink6=Edward Marcotte |title=Systematic discovery of nonobvious human disease models through orthologous phenotypes |journal=Proceedings of the National Academy of Sciences |volume=107 |issue=14 |pages=6544–9 |date=April 2010 |pmid=20308572 |doi=10.1073/pnas.0910200107 |url=http://www.marcottelab.org/paper-pdfs/PNAS_Phenologs_2010.pdf |pmc=2851946}}</ref>
The [[Unicellular organism|unicellular life cycle]] of cancer and [[Entamoeba]] is uniquely similar, and thus contradicts the [https://www.worldscientific.com/doi/abs/10.1142/9789811223495_0012 molecular phylostratigraphic theory] for the origin of cancer. This deep relationship between the two cell systems is supported by the "amoeba model", which provides a greater understanding of the biology of cancer from the evolutionary perspective.<ref name=":0">{{Cite journal |last=Niculescu |first=Vladimir F. |date=April 4, 2022 |title=Cancer genes and cancer stem cells in tumorigenesis: Evolutionary deep homology and controversies |journal=Genes & Diseases |volume=9 |issue=5 |pages=1234–1247 |doi=10.1016/j.gendis.2022.03.010 |pmid=35873035 |pmc=9293697 }}</ref> The G + S life cycle of [[Entamoeba]] is the closest common ancestor than compared to any other life cycle of unicellular organisms. Similarly, both cell systems, [[amoeba]] and [[cancer]], use the deep homologous G + S gene module that was evolved by a common ancestor. Some parallels that they share are too close for coincidence including:


* A reproductive asexual germ-line capable of forming [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3220357/ germ-line stem cells] (GSCs, referred to as CSCs in cancer) and a somatic cell line without reproductive GSC function;
⚫
== References ==
* [[Germ cell|Germ]] and [[Soma (cell body)|soma cells]] that proliferate through asymmetric and symmetric cell cycles and can interconvert by transitioning from germ to soma (GST) and from soma to germ (SGT); both processes are referred to as MET and EMT in cancer;
⚫
{{reflist|30em}}
* Oxygen-sensitive germlines that irreversibly lose their reproductive function due to irreparable DNA damage caused by excess oxygen;
* DNA damage repair (DDR) mechanisms to repair [[DNA replication]] and [[polyploidization]] defects and maintain genomic integrity of nascent GSCs/CSCs;
* DNA DSB repair mechanisms via MGRS and PGCC structures, with or without [[Cell fusion|homologous cell fusion]].<ref name=":0" />

MGRSs are also known in medical terms as “pre-existing Polypoid Giant Cancer Cells (PGCCs)” and are frequently observed in untreated cancers.{{citation needed|date=May 2023}} In cancer, the reproductive [[Germline|germ-line]] cycle starts with a precursor cell. This cell will then polyploidize within a cell envelope. This cancer germ-line undergoes a process of development that is similar to the Entamoeba germline. A significant trace of deep homology can be found in mammalian germ-line stem cells. Based on a previous hypothesis, the germ-line is the common ancestor in somatic stem cell lineages. Daughter GSCs are the only stem cells that have the capability of passing genetic information throughout generations.<ref name=":0" />

⚫
==Algorithm==

⚫
In 2010, a team led by [[Edward Marcotte]] developed an [[algorithm]] that identifies deeply homologous genetic modules in unicellular organisms, plants, and animals based on [[phenotype]]s (such as traits and developmental defects). The technique aligns phenotypes across organisms based on [[Homology (biology)#Orthology|orthology]] (a type of homology) of genes involved in the phenotypes.<ref>{{cite news |author=Zimmer, Carl |author-link=Carl Zimmer |url=https://www.nytimes.com/2010/04/27/science/27gene.html?hp=&pagewanted=all |title=The Search for Genes Leads to Unexpected Places |work=The New York Times |date=April 26, 2010}}</ref><ref name="McGary2010">{{cite journal |author1=McGary, K. L. |author2=Park, T. J. |author3=Woods, J. O. |author4=Cha, H. J. |author5=Wallingford, J. B. |author6=Marcotte, E. M. |author-link6=Edward Marcotte |title=Systematic discovery of nonobvious human disease models through orthologous phenotypes |journal=Proceedings of the National Academy of Sciences |volume=107 |issue=14 |pages=6544–9 |date=April 2010 |pmid=20308572 |doi=10.1073/pnas.0910200107 |url=http://www.marcottelab.org/paper-pdfs/PNAS_Phenologs_2010.pdf |pmc=2851946|bibcode=2010PNAS..107.6544M |doi-access=free }}</ref>


== See also ==
== See also ==
* {{annotated link|Body plan}}
* {{annotated link|Body plan}}

⚫
== References ==
⚫
{{reflist|30em}}


[[Category:Evolution by phenotype]]
[[Category:Evolution by phenotype]]

Latest revision as of 22:24, 21 August 2024

pax6 alterations result in similar phenotypic alterations of eye morphology and function across a wide range of species.

In evolutionary developmental biology, the concept of deep homology is used to describe cases where growth and differentiation processes are governed by genetic mechanisms that are homologous and deeply conserved across a wide range of species.

History

[edit]
Further information: Evolutionary developmental biology

In 1822, the French zoologist Étienne Geoffroy Saint-Hilaire dissected a crayfish, discovering that its body is organised like a vertebrate's, but inverted belly to back (dorsoventrally):[1]

I just found that all the soft organs, that is to say, the principal organs of life are found in crustaceans, and so in insects, in the same order, in the same relationships and with the same arrangement as their analogues in the high vertebrate animals ... What was my surprise, and I may add, my admiration, seeing [such] a rule ...[1]

Homologous hox genes in such different animals as insects and vertebrates control embryonic development and hence the form of adult bodies. These genes have been highly conserved through hundreds of millions of years of evolution.

Geoffroy's homology theory was denounced by the leading French zoologist of his day, Georges Cuvier, but in 1994, Geoffroy was shown to be correct.[1] In 1915, Santiago Ramon y Cajal mapped the neural connections of the optic lobes of a fly, finding that these resembled those of vertebrates.[1] In 1978, Edward B. Lewis helped to found evolutionary developmental biology, discovering that homeotic genes regulated embryonic development in fruit flies.[1]

In 1997, the term deep homology first appeared in a paper by Neil Shubin, Cliff Tabin, and Sean B. Carroll, describing the apparent relatedness in genetic regulatory apparatuses which indicated evolutionary similarities in disparate animal features.[2]

Difference from ordinary homology

[edit]

Whereas ordinary homology is seen in the pattern of structures such as limb bones of mammals that are evidently related, deep homology can apply to groups of animals that have quite dissimilar anatomy: vertebrates (with endoskeletons made of bone and cartilage) and arthropods (with exoskeletons made of chitin) nevertheless have limbs that are constructed using similar recipes or "algorithms".[2][3][4][5]

Within the metazoa, homeotic genes control differentiation along major body axes, and pax genes (especially PAX6) help to control the development of the eye and other sensory organs. The deep homology applies across widely separated groups, such as in the eyes of mammals and the structurally quite different compound eyes of insects.[3]

Similarly, hox genes help to form an animal's segmentation pattern. HoxA and HoxD, that regulate finger and toe formation in mice, control the development of ray fins in zebrafish; these structures had until then been considered non-homologous.[6]

There is a possible deep homology among animals that use acoustic communication, such as songbirds and humans, which may share functional versions of the FOXP2 gene.[7]

In cancer stem cells

[edit]

In modern day biology, the depth of understanding deep homology has evolved into focusing on the molecular and genetic mechanisms and functions rather than simple morphology. Cancer stem cells (CSCs) are a population of cells within a tumor that have the ability to self-renew and differentiate into different cell types, similar to normal stem cells. The stem cell theory of cancer suggests that there is a subpopulation of cells, referred to as cancer stem cells, that have certain characteristics that make them unique among other types of cells within a cancer. The traits that are included in CSCs are that they multiply indefinitely, are resistant to chemotherapy, and are proposed to be responsible for relapse after therapy.[8]

Life cycle of cancer

[edit]

The unicellular life cycle of cancer and Entamoeba is uniquely similar, and thus contradicts the molecular phylostratigraphic theory for the origin of cancer. This deep relationship between the two cell systems is supported by the "amoeba model", which provides a greater understanding of the biology of cancer from the evolutionary perspective.[9] The G + S life cycle of Entamoeba is the closest common ancestor than compared to any other life cycle of unicellular organisms. Similarly, both cell systems, amoeba and cancer, use the deep homologous G + S gene module that was evolved by a common ancestor. Some parallels that they share are too close for coincidence including:

  • A reproductive asexual germ-line capable of forming germ-line stem cells (GSCs, referred to as CSCs in cancer) and a somatic cell line without reproductive GSC function;
  • Germ and soma cells that proliferate through asymmetric and symmetric cell cycles and can interconvert by transitioning from germ to soma (GST) and from soma to germ (SGT); both processes are referred to as MET and EMT in cancer;
  • Oxygen-sensitive germlines that irreversibly lose their reproductive function due to irreparable DNA damage caused by excess oxygen;
  • DNA damage repair (DDR) mechanisms to repair DNA replication and polyploidization defects and maintain genomic integrity of nascent GSCs/CSCs;
  • DNA DSB repair mechanisms via MGRS and PGCC structures, with or without homologous cell fusion.[9]

MGRSs are also known in medical terms as “pre-existing Polypoid Giant Cancer Cells (PGCCs)” and are frequently observed in untreated cancers.[citation needed] In cancer, the reproductive germ-line cycle starts with a precursor cell. This cell will then polyploidize within a cell envelope. This cancer germ-line undergoes a process of development that is similar to the Entamoeba germline. A significant trace of deep homology can be found in mammalian germ-line stem cells. Based on a previous hypothesis, the germ-line is the common ancestor in somatic stem cell lineages. Daughter GSCs are the only stem cells that have the capability of passing genetic information throughout generations.[9]

Algorithm

[edit]

In 2010, a team led by Edward Marcotte developed an algorithm that identifies deeply homologous genetic modules in unicellular organisms, plants, and animals based on phenotypes (such as traits and developmental defects). The technique aligns phenotypes across organisms based on orthology (a type of homology) of genes involved in the phenotypes.[10][11]

See also

[edit]
  • Body plan – Set of morphological features common to members of a phylum of animals

References

[edit]
  1. ^ a b c d e Held, Lewis I. (February 2017). Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo. Cambridge University Press. pp. 2–5. ISBN 978-1316601211.
  2. ^ a b Shubin, Neil; Tabin, Cliff; Carroll, Sean (1997). "Fossils, genes and the evolution of animal limbs". Nature. 388 (6643). Springer Nature: 639–648. Bibcode:1997Natur.388..639S. doi:10.1038/41710. PMID 9262397. S2CID 2913898.
  3. ^ a b Carroll, Sean B. (2006). Endless Forms Most Beautiful. Weidenfeld & Nicolson. pp. 28, 66–69. ISBN 0-297-85094-6.
  4. ^ Gilbert, Scott F. (2000). "Homologous Pathways of Development". Developmental biology (6th ed.). Sunderland, Mass: Sinauer Associates. ISBN 0-87893-243-7.
  5. ^ Held, Lewis I. (February 2017). Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo. Cambridge University Press. pp. viii and throughout. ISBN 978-1316601211.
  6. ^ Zimmer, Carl (2016-08-17). "From Fins Into Hands: Scientists Discover a Deep Evolutionary Link". The New York Times. Retrieved 21 October 2016.
  7. ^ Scharff, Petri; Constance, Jane (July 2011). "Evo-Devo, Deep Homology and FoxP2: Implications for the Evolution of Speech and Language". Philos. Trans. R. Soc. B. 366 (1574): 2124–2140. doi:10.1098/rstb.2011.0001. PMC 3130369. PMID 21690130.
  8. ^ "Department of Cancer Biology - Cancer Stem Cells". Mayo Clinic. Retrieved 2023-04-10.
  9. ^ a b c Niculescu, Vladimir F. (April 4, 2022). "Cancer genes and cancer stem cells in tumorigenesis: Evolutionary deep homology and controversies". Genes & Diseases. 9 (5): 1234–1247. doi:10.1016/j.gendis.2022.03.010. PMC 9293697. PMID 35873035.
  10. ^ Zimmer, Carl (April 26, 2010). "The Search for Genes Leads to Unexpected Places". The New York Times.
  11. ^ McGary, K. L.; Park, T. J.; Woods, J. O.; Cha, H. J.; Wallingford, J. B.; Marcotte, E. M. (April 2010). "Systematic discovery of nonobvious human disease models through orthologous phenotypes" (PDF). Proceedings of the National Academy of Sciences. 107 (14): 6544–9. Bibcode:2010PNAS..107.6544M. doi:10.1073/pnas.0910200107. PMC 2851946. PMID 20308572.
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