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Asian Journal of Development Matters
Vol 3 (1), January 2009, 79-85Special Article
Anthropology and Genomics: Reconsideration
Parvathi Kumara Reddy Thavanati1* & A Chandrasekar
2
1Instituto de Genetica, Departmento de Biologia Molecular y Genomica, Universidad de
Guadalajara, Guaadalajara. Jal. Mexico.2
Anthropological Survey of India, SouthernRegional Centre, Mysore, India.
Introduction
Anthropology is a science, which
deals with the study of human beings. It triesto understand the socio-cultural and biological
aspects of humans in a comprehensive
perspective. Strictly speaking in this subjectwe study about ourselves. Anthropology is
neither dead nor dying as pointed out by
earlier scholars (Basu and Biswas, 1980;
Danda, 1981; Reddy et al., 1993; Rao, 1998),
but is progressively growing and developingwith its central theme of study of human
origin, evolution, migration and spread, and
finding the causes of human variations inspace and time. The sluggish or worthless
anthropologists who entered the discipline
accidentally are, unfortunately, trying to
triangulate it due to their non-contributiveefforts in the discipline.1
Anthropology is often defined as
being "holistic" and based on a "four-field"
approach. There is an ongoing dispute on thisview; supporters (Shore, 1999) consider
anthropology holistic in two senses: it isconcerned with all human beings across timesand places, and with all dimensions of
humanity (evolutionary, biophysical,
sociopolitical, economic, cultural,psychological, etc.); also many academic
programs following this approach take a
"four-field" approach to anthropology that
encompasses physical anthropology,
archeology, linguistics, and culturalanthropology or social anthropology. The
ROAD TRUST 2009
definition of anthropology as holistic and the
"four-field" approach are disputed by some
leading anthropologists, (Robert, 2002; RobinFox 1991.) that consider those as artifacts
from 19th century social evolutionary thought
that inappropriately impose scientificpositivism upon cultural anthropology. (Segal,
et al 2005) While originating in the US, both
the four-field approach and debates
concerning it have been exported
internationally under American academicinfluence (Smart 2006). 2
The four fields are:
Biological or physical anthropologyseeks to understand the physical human
being through the study of human
evolution and adaptability, population
genetics, and primatology. Subfields or
related fields include anthropometrics,forensic anthropology, osteology, and
nutritional anthropology.
Socio-cultural anthropology is the
investigation, often through long term,
intensive field studies (includingparticipant-observation methods), of the
culture and social organization of a
particular people: language, economicand political organization, law and
conflict resolution, patterns of
consumption and exchange, kinship andfamily structure, gender relations,
Address for correspondence* Profesory Y Investigador
Email: [email protected]
http://en.wikipedia.org/wiki/Holismhttp://en.wikipedia.org/wiki/Physical_anthropologyhttp://en.wikipedia.org/wiki/Archeologyhttp://en.wikipedia.org/wiki/Linguisticshttp://en.wikipedia.org/wiki/Cultural_anthropologyhttp://en.wikipedia.org/wiki/Cultural_anthropologyhttp://en.wikipedia.org/wiki/Social_anthropologyhttp://en.wikipedia.org/wiki/Holismhttp://en.wikipedia.org/wiki/Sociocultural_evolutionhttp://en.wikipedia.org/wiki/Positivismhttp://en.wikipedia.org/wiki/Cultural_anthropologyhttp://pzacad.pitzer.edu/~dsegal/http://en.wikipedia.org/wiki/Biological_anthropologyhttp://en.wikipedia.org/wiki/Evolutionhttp://en.wikipedia.org/wiki/Adaptationhttp://en.wikipedia.org/wiki/Population_geneticshttp://en.wikipedia.org/wiki/Population_geneticshttp://en.wikipedia.org/wiki/Primatologyhttp://en.wikipedia.org/wiki/Anthropometricshttp://en.wikipedia.org/wiki/Forensic_anthropologyhttp://en.wikipedia.org/wiki/Osteologyhttp://en.wikipedia.org/w/index.php?title=Nutritional_anthropology&action=edithttp://en.wikipedia.org/wiki/Kinshiphttp://en.wikipedia.org/wiki/Kinshiphttp://en.wikipedia.org/w/index.php?title=Nutritional_anthropology&action=edithttp://en.wikipedia.org/wiki/Osteologyhttp://en.wikipedia.org/wiki/Forensic_anthropologyhttp://en.wikipedia.org/wiki/Anthropometricshttp://en.wikipedia.org/wiki/Primatologyhttp://en.wikipedia.org/wiki/Population_geneticshttp://en.wikipedia.org/wiki/Population_geneticshttp://en.wikipedia.org/wiki/Adaptationhttp://en.wikipedia.org/wiki/Evolutionhttp://en.wikipedia.org/wiki/Biological_anthropologyhttp://pzacad.pitzer.edu/~dsegal/http://en.wikipedia.org/wiki/Cultural_anthropologyhttp://en.wikipedia.org/wiki/Positivismhttp://en.wikipedia.org/wiki/Sociocultural_evolutionhttp://en.wikipedia.org/wiki/Holismhttp://en.wikipedia.org/wiki/Social_anthropologyhttp://en.wikipedia.org/wiki/Cultural_anthropologyhttp://en.wikipedia.org/wiki/Cultural_anthropologyhttp://en.wikipedia.org/wiki/Linguisticshttp://en.wikipedia.org/wiki/Archeologyhttp://en.wikipedia.org/wiki/Physical_anthropologyhttp://en.wikipedia.org/wiki/Holism7/28/2019 TPK Reddy
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Parvathi Kumara Reddy Thavanati & A Chandrasekar 80
childrearing and socialization, religion,
mythology, symbolism, etc.
Linguistic anthropology seeks to
understand the processes of human
communications, verbal and non-verbal,variation in language across time and
space, the social uses of language, and therelationship between language and
culture.
Archaeology studies the contemporarydistribution and form of artifacts
(materials modified by past human
activities), with the intent ofunderstanding distribution and movement
of ancient populations, development of
human social organization, and
relationships among contemporary
populations; it also contributessignificantly to the work of population
geneticists, historical linguists, and many
historians.
In this paper it is mainly
focusing on Molecular Anthropology
which emerging and out coming field ofBiological Anthropology / Physical
Anthropology.
What is Molecular Anthropology?
Molecular Anthropology is a newly emergingdiscipline, which synchronizes the theoretical
and methodological concepts of physical
anthropology and Molecular Genetics in the
study of human diseases and promotion ofhealth of human populations. This includes
the integral approaches of physicalanthropologist with interests in human
biology, human genetics, molecular medicine,
human growth, development and nutrition,
and human being as physical entity, and of a
Socio cultural anthropologist whose interests
are in the areas of health behavior, medicalcare (intervention) systems, health planning,
psychosomatic illness including mental health,
correlation of demographic variables andmainly to trace evolutionary pattern. The
contention is that a Molecular Anthropology
approach suits the best when it emphasizes the
biological basis of health and disease, while at
the same time actively incorporating and
understanding the socio-cultural andeconomical constellations involved in the
nature of sickness process in the society. In
Molecular Anthropology, we use serologicaland biochemical markers not only in personal
identification in forensic science, but also for
clinical purposes in prenatal diagnosis ofgenetic anomalies, genetic counseling,
paternity disputes, sports and industry,
physiological experiments, etc. Thus,
biomedical anthropology has multifaceted
applications in diverse fields of science.
It is a recent field of academic work
called Molecular Anthropology. Molecularbecause information is derived from large
molecules such as proteins and the nucleicacids ribonucleic acids or RNA anddeoxyribonucleic acids or DNA.
It is Anthropology because we
reconstruct the nature of human societies in
their pre-literate stages, before industrial life
came along. As we are about 150,000 yearsold and live in industrial society for at most
400 years, molecular anthropology covers
most of human history. TraditionalAnthropology relied on archaeology (the
study of things left behind by humans long
after they have perished) as well aspaleontology (the study of bones and otheranatomical parts) to draw conclusions about
human life.
Now anthropology draws onadditional layer of information provided by
molecular biology, which is the study of the
structure and function of the large moleculesof living organisms. Knowledge of molecules
by no means replaces the importance of
archaeology or paleontology. It enhances
knowledge by introducing another layer, at
http://en.wikipedia.org/wiki/Linguistic_anthropologyhttp://en.wikipedia.org/wiki/Languagehttp://en.wikipedia.org/wiki/Archaeologyhttp://en.wikipedia.org/wiki/Artifact_%28archaeology%29http://en.wikipedia.org/wiki/Artifact_%28archaeology%29http://en.wikipedia.org/wiki/Archaeologyhttp://en.wikipedia.org/wiki/Languagehttp://en.wikipedia.org/wiki/Linguistic_anthropology7/28/2019 TPK Reddy
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Anthropology and Genomics 81
times confirming what we know from the
study of things and bones, and at times
questioning it and raising critical debate.
Therefore, molecular anthropology stands at
the cutting edge of modern biology and thesocial sciences. UCT human genetics
professor Raj Ramesar calls it the crossings'
in modern knowledge systems betweennatural, health and social sciences, as well as
the humanities.
It is the field that brings to us
scientific ancestry testing. A growing business
worldwide, everyone is interested in his or her
ancestry. Our first curiosity when we meet one
another is to decipher where we come from.The study of human genetic polymorphisms -
is fast and ever-growing branch of
Anthropology that holds a great promise forboth past and future. Some anthropologists
believe that genetic/Molecular Anthropologyis a science of future but it must be
emphasized that it is a science of the past andpresent too. DNA is an unbroken link to our
ancestors, populations and relatives.
Molecular anthropology is useful in
estimating the contribution of different genepools to the make-up of present-day
populations and test hypotheses about origin
of linguistic and historical populationmovements. In addition, anthropology is
playing a significant role in our understanding
of gene-environment interactions andcontribution of populations to the detection ofgenes in common and complex diseases.
Anthropologists interested in reconstructing
historical population movements and
phylogenetic relationships initially usedclassical genetic data to achieve these aims.
Classical genetic data uses proteins and blood
groups. The classical genetic datacomprehensively provided the basis for the
first phase in the development of molecular
anthropology, which has been remarkably
documented in many international and Indian
research compendiums (Bhasin et al., 1994;
Bhasin and Walter, 2001; Cavalli-Sforza et
al., 1994, Mourant et al., 1976, Nei and
Roychoudhury, 1988). These large-scale
studies have demonstrated that the gene poolis not a simple sum of genes, but is a dynamic
system, which is hierarchal organised and
which maintains the memory of past events inthe history of populations. All genetic
information has a historical, anthropological,
geographical and statistical context, therefore
requires co- operation and collaborationbetween researchers in different fields. The
new or second phase, is utilizing
DNA analysis for the reconstruction
of human population structure, histories andevolution. The potential benefits from this
research are vast and valuable including; a
better understanding of the genetic andevolutionary factors that influence
populations; an understanding of geneticarchitecture of common and complex diseases
such as diabetes mellitus, dementias, heart andskeletal diseases; and a better understanding
of the origin of modern humans. The pattern
of genetic variation in modern human
populations depends on our demographic
history (population migrations, bottlenecksand expansions) as well as gene specific
factors such as mutation rates, recombination
rates and selection pressure. By examiningpatterns of genetic polymorphisms we can
infer how past demographic events and
selection have shaped variation in the genome.Thus, molecular anthropology has importantimplications for evolutionary biology, disease
analyses, and forensics. In this paper, first the
anthropological and genomic basis for genetic
variation is overviewed followed by somespecific empirical research examples
highlighting the usage of the molecular
anthropological investigations. The focus hereis on Indian studies but it cannot be exhaustive
due to space considerations (Sarabjit Mastana,
2007).
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Parvathi Kumara Reddy Thavanati & A Chandrasekar 82
Molecular anthropology is able to
confirm too that we are the descendents of a
single line of human beings and that, at no
time have we successfully cross-bred with
members of our larger family like theNeanderthals. The idea that we constitute
races' is now unquestionably a myth
especially as gene flow has reached even themost isolated populations today.
History of Molecular AnthropologyStructure of human hemoglobin. Hemoglobins
from dozens of animals and even plants were
sequenced in the 1960s and early 1970s With
DNA newly discovered as the genetic
material, in the early 1960s proteinsequencing was beginning to take off (Wilson
and Kaplan 1963). Protein sequencing began
on cytochrome C and Hemoglobin. GerhardBraunitzer sequenced hemoglobin and
myoglobin, in total more than 100s ofsequences from wide ranging species were
done. In 1967 A.C. Wilson began to promotethe idea of a "molecular clock". By 1969
molecular clocking was applied to anthropoid
evolution and V. Sarich and A.C. Wilson
found that albumin and hemoglobin has
comparable rates of evolution, indicatingchimps and humans split about 4 to 5 million
years ago (Wilson, and Sarich (1969). In
1970, Louis Leakey confronted thisconclusion with arguing for improper
calibration of molecular clocks.(Leakey 1970)
By 1975protein sequencing and comparativeserology combined were used to propose thathumans closest living relative (as a species)
was the chimpanzee.(King and Wilson 1975)
In hindsight, the last common ancestor(LCA)
from humans and chimps appears to olderthan the Sarich and Wilson estimate, but not
as old as Leakey claimed , either. However,
Leakey was correct in the divergence of oldand new world monkeys, the value Sarich and
wilson used was a significant underestimate.
This error in prediction capability highlights a
common theme.
Advantages of studying molecular
Anthropology
Two major approaches are used in
Molecular anthropology, which involve
analyzing DNA. The first and most commonapproach is to compare the DNA of groups of
living organisms, for example, comparing
humans to humans or humans toprimates. Thesecond approach relies on isolating and
analyzing DNA from an ancient source, and
comparing it to other ancient DNA or tomodern DNA. In both cases, the number of
differences between the DNA sequences of
the two groups is determined, and these are
used to draw conclusions about the relatedness
of the two groups, or the time since theydiverged from a common ancestor, or both.
The essential postulate on whichmolecular anthropology is based is that closer
genetic similarity indicates a more recentcommon ancestry. All organisms are believed
to have evolved from a single ancestor. Asdifferent life forms evolved, their DNA began
to diverge through the processes ofmutation,
natural selection, and genetic drift. Even
within the same species, populations that do
not interbreed will accumulate geneticdifferences, which increase over time. The
number of these differences is proportional to
the amount of time since the two groupsdiverged. There are several advantages to
comparing DNA data instead of external
physical characteristics (collectively called thephenotype). Environmental factors can shapethe phenotype to make two individuals with
the same genetic makeup look different. For
instance, nutrition has a profound effect on
height, and if we used average height toclassify humans, we might mistakenly
conclude that medieval humans represented
different sub-species because they weresignificantly shorter than modern humans.
DNA comparisons, on the other hand, would
show no significant difference between these
groups. Another advantage is that DNA
http://en.wikipedia.org/wiki/Gerhard_Braunitzerhttp://en.wikipedia.org/wiki/Gerhard_Braunitzerhttp://en.wikipedia.org/wiki/Hemoglobinhttp://en.wikipedia.org/wiki/Myoglobinhttp://en.wikipedia.org/wiki/Allan_Wilsonhttp://en.wikipedia.org/wiki/Vincent_Sarichhttp://en.wikipedia.org/wiki/Chimphttp://cite_note-pmid4982244-2/http://en.wikipedia.org/wiki/Louis_Leakeyhttp://cite_note-pmid5002096-3/http://en.wikipedia.org/wiki/Protein_sequencinghttp://en.wikipedia.org/wiki/Serologyhttp://en.wikipedia.org/wiki/Specieshttp://en.wikipedia.org/wiki/Chimpanzeehttp://cite_note-pmid1090005-4/http://cite_note-pmid1090005-4/http://en.wikipedia.org/wiki/Last_common_ancestorhttp://www.answers.com/topic/primatehttp://www.answers.com/topic/postulatehttp://www.answers.com/topic/divergehttp://www.answers.com/topic/mutationhttp://www.answers.com/topic/interbreedinghttp://www.answers.com/topic/phenotypehttp://www.answers.com/topic/phenotypehttp://www.answers.com/topic/interbreedinghttp://www.answers.com/topic/mutationhttp://www.answers.com/topic/divergehttp://www.answers.com/topic/postulatehttp://www.answers.com/topic/primatehttp://en.wikipedia.org/wiki/Last_common_ancestorhttp://cite_note-pmid1090005-4/http://en.wikipedia.org/wiki/Chimpanzeehttp://en.wikipedia.org/wiki/Specieshttp://en.wikipedia.org/wiki/Serologyhttp://en.wikipedia.org/wiki/Protein_sequencinghttp://cite_note-pmid5002096-3/http://en.wikipedia.org/wiki/Louis_Leakeyhttp://cite_note-pmid4982244-2/http://en.wikipedia.org/wiki/Chimphttp://en.wikipedia.org/wiki/Vincent_Sarichhttp://en.wikipedia.org/wiki/Allan_Wilsonhttp://en.wikipedia.org/wiki/Myoglobinhttp://en.wikipedia.org/wiki/Hemoglobinhttp://en.wikipedia.org/wiki/Gerhard_Braunitzerhttp://en.wikipedia.org/wiki/Gerhard_Braunitzer7/28/2019 TPK Reddy
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Anthropology and Genomics 83
sequence differences can be easily quantified
two base changes in a gene are more different
than one. Despite being random events,
mutations occur at a fairly steady rate,
constituting a "molecular clock," and so thenumber of differences can be use to estimate
the time since the two organisms shared a
common ancestor. Finally, since all organismscontain DNA, the sequences of any two
organisms can be compared. The same
techniques used in molecular anthropologycan also be applied to evolutionary questions
in other species, to determine the evolutionary
relations between different animal species, for
instance, or even between bacteria and
humans.
Critical Progress
Critical in the history of molecularanthropology.
That molecular phylogenetics couldcompete with comparative anthropology
for determining the proximity of species
to humans.
Wilson and King realized in 1975, thatwhile there was equity between the levels
of molecular evolution branching from
chimp to human to putative LCA, that
there was an inequity in morphological
evolution. Comparative morphologybased on fossils could be biased by
different rates of change (King
M.C.,1975)
Realization that in DNA there aremultiple independent comparisons. Two
techniques, mtDNA and hybridization
converge on a single answer, chimps as a
species are most closely related to
humans.
The ability to resolve population sizes
based on the 2N rule, proposed by
Kimura in the 1950s Kimura M (May
1954). To use that information tocompare relative sizes of population and
come to a conclusion about abundance
that contrasted observations based on the
paleontological record. While human
fossils in the early and middle stone age
are far more abundant than Chimpazee or
Gorilla, there are few unambiguous
chimpanzee or gorilla fossils from thesame period
ConclusionMolecular anthropology is a newly
emerging discipline, which combines the
theoretical and methodological concepts of
physical anthropology and Socio culturalanthropology in the study of disease and
health of human populations. This includes
the integral approaches of physical
anthropologist with interests in humanbiology, human genetics, molecular medicine,
human growth and development, nutrition,
human being as physical entity andevolutionary biology, and of a Socio cultural
anthropologist whose interests are in the areasof health behavior, medical care (intervention)
systems, health planning, psychosomaticillness including mental health, correlation of
demographic variables and mainly to trace
evolutionary pattern.. The contention is that a
Molecular anthropological approach functions
the best when it emphasizes the biologicalbasis of health and disease, while at the same
time actively incorporating and understanding
the socio-cultural nature of the sicknessprocess in the society. Molecular
anthropologist should move into the design
and provision of health services forintervention in improving the health status ofcertain at risk population groups, extending
their life expectancies, lowering morbidity,
mortality, arson, sexually transmitted diseases,
excessive drinking, and the other like publichealth issues. The entry of such unique
expertise is not only welcome in India, but is
imperative also. Thus, the strength ofanthropology lies in its analytical potentials,
constructive suggestions and practical
applications in the society. A Molecular
anthropologist has the responsibility to
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Parvathi Kumara Reddy Thavanati & A Chandrasekar 84
Identify him self with the cause and pursue his
role and goal with commitment and dedication
wherever he is entrusted. I think the study of
genetics of various human traits is still a
virgin area in anthropology. Deciphering andmapping of genes along with identification of
various characters in human genome is a vast
unexplored reservoir, with particular referenceto Indian lineage. Distribution and spread of
various genetic diseases in the world through
migrations, admixture and genetic drift, andexplaining their concentration in particular
geographical and ecological niches is still a
challenging task for a Molecular
anthropologist in India. Further, using the
tools of molecular Anthropology, DNAsequences can be compared among groups to
test hypotheses about the evolutionary
relatedness of organisms, and about the timethat has elapsed since divergence. Molecular
anthropology has made major contributions tounderstanding the migration and mixture
patterns of human groups. It has also providedsignificant new insights into the rise and
spread of modern humans and their relation to
earlier human groups. As more data becomes
available and better models are devised for
their interpretation, the results are likely tobecome less provisional and more certain.
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