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Genetic studies on Arabs

(Redirected from Genetic diseases of the Arab world)

Genetic studies on Arabs refers to the analyses of the genetics of ethnic Arab people in the Middle East and North Africa. Arabs are genetically diverse as a result of their intermarriage and mixing with indigenous people of the pre-Islamic Middle East and North Africa following the Arab and Islamic expansion.[1][2] Genetic ancestry components related to the Arabian Peninsula display an increasing frequency pattern from west to east over North Africa. A similar frequency pattern exist across northeastern Africa with decreasing genetic affinities to groups of the Arabian Peninsula along the Nile river valley across Sudan and the more they go south.[3] This genetic cline of admixture is dated to the time of Arab expansion and immigration to North Africa (Maghreb) and northeast Africa.[3]

In the Levant, the introduction of Islam to the region and the conversion of the region’s population to it caused major rearrangements in populations' relations and affinities through admixture with "culturally similar but geographically remote populations" with whom they enjoyed a shared Islamic culture, Arab culture and Arabic language, which led to "genetic similarities between remarkably distant populations like Jordanians, Moroccans, and Yemenis".[4]

A 2018 study of Arabs found that Peninsular Arabs genetically showed two distinct clusters and that Arabs in general can be genetically stratified into four groups; the first consisting of Maghrebi Arabs (Algerians, Moroccans, Tunisians and Libyans) along with the first Arabian Peninsula cluster, which consists of Saudis, Kuwaitis and Yemenis, the second consisting of Levantine Arabs (Palestinians, Lebanese, Syrians and Jordanians) along with Egyptians and Iraqis and Moroccan Jews, the third compromising Sudanese and Comorians, and the fourth compromising the second Arabian Peninsula cluster consisting of Omanis, Emiratis, and Bahrainis. The study confirmed the high genetic heterogeneity among Arabs, especially those of the Arabian Peninsula.[1]

Uniparental markers

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Main articles: Y-DNA haplogroups in populations of the Near East and Y-DNA haplogroups in populations of North Africa

Y-chromosome

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The most dominant Paternal Y haplogroup in Arab countries is the Arabian haplogroup J1 (J-M267) and especially its main clade J1-P58 reaching up to 80% in some countries such as Yemen, Qatar and Sudan, according to latest samples studies.[5] J1-M267 that is not P58 are found in Yemen and Oman. The mutation STR DYS388 equal or above 16 found in J1-p58 was used as genetic profiling in Forensics since the 80s to determine Middle Eastern ancestry. (Nebel et Al 2001)[6]

Below is the general distribution of Y-DNA haplogroups among populations of the Arab world:

Population Language Family[7] n[8] R1b[9] n R1a n I n E1b1b n E1b1a n J n G n N n T n L
Arabs (Algeria) Afro-Asiatic (Semitic) 35 13.0[10] 35 0.0[10] 32 50[11] 35 35[10]
Arabs (Algeria – Oran) Afro-Asiatic (Semitic) 102 10.8[12] 102 1[12] 102 50.9[12] 102 12.8[12] 102 27.4[12]
Arabs (Bedouin) Afro-Asiatic (Semitic) 32 0.0[13] 32 9.4[13] 32 6.3[13] 32 18.7[13] 32 65.6[13] 32 0.0[13]
Arabs (Iraq) Afro-Asiatic (Semitic) 10.8[14] 6.5[14] 218 8.3[11] 218 0.9[11] 156 50.6[11]
Arabs (Israel) Afro-Asiatic (Semitic) 143 8.4[13] 143 1.4[13] 143 6.3[13] 143 20.3[13] 143 55.2[13] 143 0.0[13]
Arabs (Morocco) Afro-Asiatic (Semitic) 44 3.8[15] 44 0.0[15] 44 0.0[15] 49 85.5[11] 49 20.4[11]
Arabs (Oman) Afro-Asiatic (Semitic) 121 1.7[16] 121 9.1[16] 121 0.0[16] 121 15.7[16] 121 7.4[16] 121 47.9[16] 121 1.7[16] 121 8.3[16] 121 0.8[16]
Arabs (Qatar) Afro-Asiatic (Semitic) 72 1.4[17] 72 6.9[17] 72 0.0[17] 72 5.6[17] 72 2.8[17] 72 66.7[17] 72 2.8[17] 72 0.0[17] 72 0.0[17] 72 2.8[17]
Arabs (Saudi Arabia) Afro-Asiatic (Semitic) 157 1.9[18] 157 5.1[18] 157 0.0[18] 157 7.6[18] 157 7.6[18] 157 58.0[18] 157 3.2[18] 157 0.0[18] 157 5.1[18] 157 1.9[18]
Arabs (UAE) Afro-Asiatic (Semitic) 164 4.3[17] 164 7.3[17] 164 11.6[17] 164 5.5[17] 164 45.1[17] 164 4.3[17] 164 0.0[17] 164 4.9[17] 164 3.0[17]
Arabs (Yemen) Afro-Asiatic (Semitic) 62 0.0[17] 62 0.0[17] 62 0.0[17] 62 12.9[17] 62 3.2[17] 62 82.3[17] 62 1.6[17] 62 0.0[17] 62 0.0[17] 62 0.0[17]
Arabs (Syria) Afro-Asiatic (Semitic) 20 15.0[19] 20 10.0[19] 20 5.0[19] 20 10.0[19] 20 53.0[19] 20 0.0[19] 20 0.0[19] 20 0.0[19] 20 0.0[19]
Arabs (Lebanon) Afro-Asiatic (Semitic) 31 6.4[19] 31 9.7[19] 31 3.2[19] 31 25.8[19] 31 45.2[19] 31 3.2[19] 31 0.0[19] 31 0.0[19] 31 3.2[19]
Arabs (Sudan) Afro-Asiatic (Semitic) 102 15.7[20] 102 3.9[20] 102 16.7[20] 102 47.1[20]
Arabs (Tunisia) Afro-Asiatic (Semitic) 148 6.8[10] 148 0.0[10] 148 0.0[10] 148 49.3[10] 148 1.4[10] 148 35.8[10] 148 0.0[10] 148 0.7[10] 148 0.0[10]
Arabs (Libya) Afro-Asiatic (Semitic) 63 3[21] 63 1.5[21] 63 1.5[21] 63 52.0[21] 63 0.0[21] 63 24.0[21] 63 8.0[21] 63 5.0[21] 63 1.5[21]
Saharawi (SADR) Afro-Asiatic (Semitic) 29 79.3[11] 29 3.4[11] 29 17.2[11]
Egyptians Afro-Asiatic (Semitic) 92-147 5.4[22]-4.1 92-147 0.0[22]-2.7[16] 92-147 1.1[22]-0.7[16] 92-147 43.5[22]-36.7[16] 92-147 3.3[22]-2.8[16] 92-147 22.8[22]-32.0[16] 92-147 2.2[22]-8.8[16] 92-147 0.0[22]-0.0[16] 92-147 7.6[22]-8.2[16] 92 0.0[22]
Egyptians (North) Afro-Asiatic (Semitic) 43 9.3[23] 43 2.3[23] 43 0.0[23] 43 53.5[23] 44 18.2[10] 43 7.0[23] 43 2.3[23] 43 0.0[23]
Egyptians (South) Afro-Asiatic (Semitic) 47 13.8[24] 47 78.7[24]
Lebanese Afro-Asiatic (Semitic) 914 8.1[25] 914 2.5[23] 914 4.8[23] 914 16.2[23] 914 0.7[23] 914 46.1[23] 914 6.6[23] 914 0.1[23] 914 4.7[23] 914 5.2[23]

mtDNA analysis

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The maternal ancestral lineages of Arabic countries are diverse. The original and still most prevalent maternal haplogroups of the Near East (Syria, Lebanon, Palestine, Iraq, Arabian Peninsula) and Egypt are mt (maternal) R0a1 (previously called pre-HV), M1 haplogroup ( The "back to Africa " haplogroup) a branch of Asian Haplogroup M (mtDNA) which branched from L3 Haplogroup around 70 000 years ago, and (maternal) HV1 haplogroup a branch of HV1 haplogroup that are still high in Yemen, while in the region of Syria there is a Eurasian maternal gene flow, and U5 haplogroup.[26][27][20]

HLA antigens

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Many of the genetic disorders specific to Arabs are located on HLA segment on chromosome 6. These same segment mutations are also markers of Arabs in genealogical and forensic profiling tests and studies.[28][29][26][27][20][30][31]

Autosomal DNA

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There are various West-Eurasian autosomal DNA components that characterize the populations of the Arab world, namely: the Arabian, Levantine, Coptic, and Maghrebi components. The Arabian component is the main autosomal element in the Persian Gulf region. It is most closely associated with local Arabic-speaking populations.[32]

  • The Arabian component is also found at significant frequencies in parts of the Levant and Northeast Africa.[32][33] The geographical distribution pattern of this component correlates with the pattern of the Islamic expansion, but its presence in Lebanese Christians,[a] Sephardi and Ashkenazi Jews, Cypriots and Armenians might suggest that its spread to the Levant represents an earlier event.[32] A separate study by Iosif Lazarides and colleagues published in the same year, correlated this component with Epipaleolithic Natufians from the Levant. This study produced genome-wide ancient DNA from 44 ancient Near Easterners between ~12,000 and 1,400 BCE, including Natufian hunter–gatherers, and suggested an earlier spread of Natufian ancestry to populations of the Levant and Eastern Mediterranean. Natufians were found to be of exclusive West-Eurasian origin, most closely related to modern Arabs like the Bedouins and Yemenis, followed by Egyptian and Berber peoples.[34] A 2018 re-analysis of Natufian samples, including 279 modern populations as a reference, found that the Natufians were largely of local West-Eurasian origin, but harbored 6.8% Eastern African-related ancestry, specifically an Omotic component, which peaks among the Aari people. It is suggested that this Omotic component may have been introduced into the Levant along with the specific Y-haplogroup sublineage E-M215, also known as "E1b1b", to Western Eurasia.[35]
  • The Levantine component is the main autosomal element in the Near East and Caucasus. It peaks among Druze populations in the Levant. The Levantine component diverged from the Arabian component about 15,500-23,700 ypb.[32]
  • The Coptic component peaks among Copts in Sudan.[36]
  • The Maghrebi component is the main autosomal element in the Maghreb. It peaks among the non-Arabized Berber populations in the region.[33] The modern Northern African (Berber) populations have been described as a mosaic of Northern African (Iberomaurusian), Middle Eastern, European (Early European Farmer), and Sub-Saharan African-related ancestries.[37]

A genetic study published in the "European Journal of Human Genetics" in Nature (2019) showed that Middle Easterners (Arabs) are closely related to Europeans and Northern Africans as well as to Southwest Asians.[38] The "Arab macropopulation" is generally closely related to other "West-Eurasian" populations, such as Europeans or Iranian peoples. The Arab expansion marked one of the last expansions of West-Eurasian ancestry into Africa, with the earliest scientifically attested West-Eurasian geneflow into Africa being dated back to 23,000 BCE (or already earlier), and may be associated with the spread of Proto-Afroasiatic from the Middle East.[39][40] Hodgson et al. (2014) found a distinct non-African ancestry component among Northeastern Africans (dubbed "Ethio-Somali"), which split from other West-Eurasian ancestries, most closely to the Arabian ancestry component, about 23,000 years ago, and migrated into Africa pre-agricultural (between 12,000 to 22,000 years ago). This component is suggested to have been present in considerable amounts among the Proto-Afroasiatic-speaking peoples. The authors argue that the Ethio-Somali component and the Maghrebi component descended from a single ancestral lineage, which split from the Arabian lineage and migrated into Africa from the Middle East. In Africa, this West-Eurasian lineage diverged into the Maghrebi component, predominant in Northern Africa, and the Ethio-Somali component, found in significant varying degrees among populations of the Horn of Africa.[41]

In 2021, a study showed no genetic traces of early expansions out-of-Africa in present-day populations in the Near-East, but found Arabians to have elevated Basal Eurasian ancestry that dilutes their Neanderthal ancestry.[42]

Genetic disorders

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The Arab world has one of the highest rates of genetic disorders globally; some 906 pathologies are endemic to the Arab states, including thalassaemia, Tourette's syndrome, Wilson's disease, Charcot-Marie-Tooth disease, mitochondrial encephalomyopathies, and Niemann-Pick disease.[43]

Databases

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Several organizations maintain genetic databases for each Arabic country, such as Saudi Human Genome Program (SHGP). Even though the KGP, SHGP, QGP, BGP and EGP are revisiting the genetics and genomics of Arab populations’ ancestries, lack of complete coordination between the initiatives is a major limitation on revealing the real disease markers of the Arab population.[44]

The Centre for Arab Genomic Studies (CAGS) is the main organization based in the United Arab Emirates. It initiated a pilot project to construct the Catalogue for Transmission Genetics in Arabs (CTGA) database for genetic disorders in Arab populations. At present, the CTGA database is centrally maintained in Dubai and hosts entries for nearly 1,540 Mendelian disorders and related genes. This number is increasing as researchers are joining the largest Arab scientific effort to define genetic disorders described in the region. The Center promotes research studies on these emergent disorders.[45]

Some of the genetic disorders endemic to the Arab world are: hemoglobinopathy, sickle cell anemia, glucose-6-phosphate dehydrogenase deficiency, and fragile X syndrome (FXS), which is an inherited genetic condition with critical consequences. The Centre provide information about specific countries,[46] and maintain a list of Genomic diseases.[47][48]

Specific rare autosomal recessive diseases are high in Arabic countries like Bardet Biedl syndrome, Meckel syndrome, congenital chloride diarrhea, severe childhood autosomal recessive muscular dystrophy (SMARMD), lysosomal storage diseases and PKU are high in the Gulf states. Dr Teebi's book provides detailed information and by country.[49] Even the Middle East respiratory syndrome coronavirus (MERS-CoV) that was first identified in Saudi Arabia last year, it has infected 77 people, mostly in the Middle East and Europe. Forty of them – more than half – have died. But MERS is not yet a pandemic, could become pervasive in genetic disease patient. [50]

Dr Thurman' guidebook about rare genetic diseases[51] Another book Arabic genetic disorders layman guide[52] Saudi Journal article about genetic diseases in Arabic countries[53] The highest proportion of genetic disorders manifestations are: congenital malformations, followed by endocrine metabolic disorders and then by neuron disorders (such as neuromotor disease) and then by blood, immune disorders and then neoplasms. The Mode of Inheritance is mainly autosomal recessive followed by autosomal dominant.

Some of the diseases are beta-thalassemia mutations, sickle-cell disease, congenital heart-disease, glucose-6-phosphate dehydrogenase deficiency, alpha-thalassemia, molecular characterization, recessive osteoperosis, gluthanione-reducatsafe DEf. A study about sickle cell anemia in Arabs[54] article about Birth defects[26] Glucose phosphate isomerase deficiency responsible for unexpected hemolytic episodes.[55] one of late Dr Teebi's syndromes.[56] flash cards guide.[57][58][59][60] NY Times article[61] In Palestinian Arabs study[62] study about potential on pharmacology [63] another study on Arab Palestinians[64] Database of Genetic disorders in Arabs study[65] In Palestinians[66] new general study about databases[67] Database for B thalassemia in Arabs[68] Israeli National genetic bank contains genetic mutations of Arabs[69] Teebi database 2002[70] 2010 genes responsible for genetic diseases among Palestinian Arabs[71][72] The next Pan-Arab conference Nov 2013 [73]

Diagnosis of genetic disorders

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Diagnosis of genetic disorders after birth is done by clinicians, lab tests, and sometimes genetic testing. Genetic testing profiling screening of pregnant women's fetuses for List of disorders included in newborn screening programs using microchip genetic microarry might help detect genetic mutations incompatible with life and determining abortion. Some genetic tests of born children might help finding the right treatment.[74][75] Mothers could test for genetic disorders in the fetus by method of chorionic villus sampling (CVS) or amniocentesis.

It is possible for medical genetic testing to discover genetic mutations that predispose or active in causing a disease that might probably happen in the future at later age or causing a disease with unnoticed symptoms that will increase in the future. genetic testing is increasingly being used by physicians after becoming cheaper, and the still existing resistance by HMO medical providers, because such testing make shortcuts towards faster diagnosis, causing the HMOs to loose profits from extended physicians visits and other laboratory tests that laboratories share profits with HMOs, where "Doctor patient relationship" aimed at helping patient conflict with Profit making HMOs and big clinics.

Genealogy and geography

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Consanguinity (interbreeding, marriage between cousins, inside the family, the clan, the tribe, or even country especially small countries like Kuwait, to preserve fortunes in the family or clan or tribe especially after the Oil discovery in Gulf) is the main cause of Arabic genetical diseases, in addition to mutagens such as environmental factors such as the oil industry and radiological waste dumps in sea and land.

Most affected are the small countries such as Kuwait Jordan and the Gulf states, but all other Arabic countries because of Consanguinity. Consanguinity also is causing novel new diseases that are unpredictable and costly to diagnose and treat ( where treatments of genetic diseases are still lacking), characterized by a high level of genetic mutations.

Intellectual disability, neurogenetic disorders, blood and bleeding disorders and rare genetic diseases and retinal dystrophy and novel candidate disease marker variations.while Saudi mtDNA association with obesity.

Intellectual disability comes first with the combined and observed carrier frequency of 0.06779!, followed by retinal dystrophy, glaucoma, inborn errors of metabolism, sickle cell disease/thalassemia, deafness, dysmorphic/dysplasia, ataxia, myopathy/muscular dystrophy, polycystic kidney disease/nephronophthisis, Joubert syndrome/Meckel-Gruber syndrome, carbonic anhydrase II deficiency, cystic fibrosis, Bardet-Biedl syndrome, and cataract.

Carrier frequency of the intellectual disability is three times more than that of sickle cell disease and thalassemia among the Arab population with 25–60% consanguinity rates!. 33 genes (observed phenotype), were identified among the pre-screened multiplex consanguineous families with neurogenetic disorders.

Previously known Blood and bleeding disorders: Molecular defects, blood disorders, β-thalassemia, sickle cell disorder, α-thalassemia and G6PD (glucose-6-phosphate dehydrogenase) deficiency are the most common in the Arab population.

Since Arabic populations tend to have Arabic paternal ancestry, mainly the Arabian male Y- J1 haplogroup especially j1-P58 There is much more of a diversity amongst the maternal ancestries gene pool, but "historically" poor countries such as Yemen and Arabian peninsula lack female ancestry diversity, as seen most in greater Syria Iraq and Egypt that have extra maternal haplogroups than the Middle East- associated maternal (aka mito or mitochondrial) HV1b, U, U5, M1, R0a haplogroups, and the traditional Consanguinity that had increased due to oil fortune preservation trend, significantly trumped up the genetic diseases and genetic predisposition for such diseases that are becoming Novel "new" in nature, ie unknown yet to discover and understand the etiology and prepare treatments or prevention.

The new trend to stay local among Arabic populations in Arabic countries and especially after creating small countries after independence from the west in the 50s.Marrying into a different gene pool such as historically isolated Yemen or different and isolated ie Indonesia would help.

While diabetes is very prevalent among Arabs 10% up to 20%, responsible Arab genes have not been found yet but Saudi mitochondrial gene was found that cause obesity that predispose to diabetes.[44][76]

Bare lymphocyte syndrome high in western Arabic block Morocco, type II limb-girdle muscular dystrophy, type 2C in Libya, hemolytic-uremic syndrome in Saudia, ankylosing spondylitis in Egypt and East block, alpha-thalassemia in all countries except Egypt, Syria, and Iraq, cystic fibrosis in Iraq Saudi Yemen Libya Morocco, familial Mediterranean fever fmf in east block and Libya Morocco, beta thalassemia in all countries, g6dh deficiency all countries.[58]

Most genetic markers of Arabs' genetic diseases are phenotypic, i.e. specific mutations of Arab peoples, especially in countries. Even though genetic mutations of Gulf states are mostly the same, but some genetic phenotypes are Kuwaiti etc.

The diseases have geographical distribution among Arab countries such as greater Syria, Gulf states, Yemen, Western block (Morocco, Algeria, Tunisia), because of the restricted marriages to each block or even to one country. Moreover, cousin marriages (consanguinity) and endogamy (marriages restricted to minority sects) exacerbate the problem. Distancing of marriages from distant gene pools might help resolve the problem in Arabic countries. Many of the pronounced genetic deficiencies in Arabs are located on HLA segment on chromosome 6. This same segment mutations are markers of Arabs in Genealogical and forensic profiling tests and studies. Such studies as:[26][30][27][20][31] Arab population data on the PCR-based loci:HLA [28] HLA polymorphism in Saudi.[29]

Since over 70% of Arab genetic disorders are autosomal-recessive, meaning the defective gene has to be found in both father and mother, and since the gene pool is similar in population (males and females alike since autosomal chromosomes are admixture from father and mother, in closed societies (marriages from same sect endogamy, or same tribe or even from same country, or even from the same block of countries since it is similar in geographical blocks as shown in the online brochures referenced above.[77]

Founder Effect Arabic mutations causing Diseases

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Preface: The founder effect disease causing mutations where "The founder effect refers to the concept that a given gene appeared (presumably by mutation) in a small ancestral population (i.e., in a founder) and by random chance was transmitted to a large number of that founder’s offspring.". The founder population could be the common ancestry of Arabs or the forced localizations caused by artificial countries inside the larger group of ancestry, hence causing Arab specific founder effect mutation disease found only in all Arabic countries, and Arabic country specific mutation diseases caused by increasing Homozygosity (the existence of same gene on both chromosomes pairs, hence recessive disease increasing in just few generations). The genetic abnormality will increase incrementally with the decrease of number of isolated populations making tribe specific diseases and new Novel genetic defects.[78]

In recessive diseases, founder populations where underlying levels of genome-wide homozygosity are high due to shared common ancestry, but also for consanguineous populations that will have large genome-wide homozygous regions due to inbreeding. Having a catalog of disease-associated variation in these populations enables rapid, early, and accurate diagnoses that may improve patient outcomes due to informed clinical management and early interventions.[79]

The following are diseases that can happen to genetic mutations that have ancient ancestry founding effect mutations that happened in Arabic Ancestry ( not including the many Novel new mutations caused by Consanguinity and unknown factors in recent times):[80]

  • Sickle cell Anemia
  • Hydroxylaze deficiency
  • Ataxia with vitamin E deficiency
  • Genetic hetero intestinal malabsorption B12
  • Autosomal recessive Hearing loss
  • Autosomal recessive deafness
  • Alpha and Betha Thalassemia
  • Carbonic anhidrase deficiency,
  • Familial Mediterranean fever,
  • Fragile X syndrome,
  • Gaucher disease,
  • Glucose 6 phosphatase dihedrogenase deficiency,
  • Hereditary Hemochromatosis,
  • Limbs Girdle Muscular deficiency type c,
  • Megalo plastic anemia,
  • Parkinson's,
  • Phenylketonuria
  • Primary hyperocaluria
  • Congenital Myasthenia Syndrome
  • Criger- Najjar Type I syndrome
  • Distal Renal tubero Acidosis
  • Sickle Haemoglobin
  • G6pd deficiency
  • A and B Thalassemia
  • Defnb1
  • Phenylketonuria PAH
  • Distal Renal tubular Acidosis
  • Cystic fibrosis
  • Leber congenital
  • Autosomal recessive myopathy inclusion body
  • Mitochondrial gene for obesity in Saudis that along with sedentary life predispose to Diabetes.

Prevention

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To use Genetic counseling especially before and after marriage, avoiding Consanguinity, marrying into a different gene pool especially that did not have Consanguinity. Avoiding mutagens ie factors that cause mutations such as radioactive and other environmental factors such as living near high microwave frequency electric poles, and near or on top of previous "Brown Fields" AKA industrial establishment. The importance to report to the medical provider the ethnicity As Arabic or Berber and specific country such as Saudi Arabia so the provider can design genetic testing and other tests to discover the possible ailments especially large DNA sequencing and specific DNA testing became available and reasonably affordable. Most genetic diseases go unnoticed by person or physician or dormant and show up later in life, and so genetic testing might reveal the probable existence or dormancy of a disease or syndrome before it manifest or to confirm a disease in spite of negative other non genetic laboratory tests. many disease causing genetic alterations are country specific or even sub category such as " Jewish Tunisian" for example. knowing the ancestral Y paternal and mitochondrial maternal haplogroups and other private companies Nuclear DNA might give Bird's eye view of what to expect along with self identification of race and country of origin. Interventions during pregnancy, including: early detection and management of maternal conditions such as diabetes; early detection and management of infections. avoidance of teratogens (infections such as toxoplasmosis, drugs); prenatal screening by maternal serum markers in first trimester and by ultrasonography; prenatal diagnosis with/without termination of pregnancy; care of fetus for conditions such as Rh incompatibility; avoidance of tobacco use and exposure to pollution; and supplementation with iron and folate. Interventions after birth, including: newborn biochemical screening for congenital hypothyroidism, phenylketonuria (PKU), galactosaemia, sickle cell disorder, glucose-6-phosphate dehydrogenase (G6PD) deficiency, congenital adrenal hyperplasia, methyl coenzyme dehydrogenase deficiency;.[81]

Discoveries of new syndromes

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Teebi type of hypertelorism (1987), Teebi Shaltout syndrome (1989), Al Gazali syndrome (1994), Megarbane syndrome (2001)

There are even new Arabic names for emerging genetic disorders and syndromes like:

Spectrum of Genetic Disorders in Arabs, Lebanese type of mannose 6--phosphate receptor recognition defect (1984), Algerian type of spondylometaphyseal dysplasia (1988), Kuwaiti type of cardioskeletalsyndrome (1990), Yemenite deaf-blind hypopigmentation syndrome (1990), Nablus mask-like facial syndrome (2000), Jerash type of the distal hereditary motor neuropathy (2000), Karak syndrome (2003), Omani type of spondyloepiphy.[82]

Notes

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  1. ^ Haber et al. (2013)[32] does not differentiate between different groups of Christians studied. Earlier research discussed by Haber et al. specified only that "Christian, including the major sects Maronite, Orthodox, and Catholic", Lebanese populations were sampled.[25] For details on these groups, see: Lebanese Greek Orthodox Christians; Lebanese Maronite Christians; and Catholic Church in Lebanon.

See also

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References

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  1. ^ a b Hajjej, Abdelhafidh; Almawi, Wassim Y.; Arnaiz-Villena, Antonio; Hattab, Lasmar; Hmida, Slama (9 March 2018). "The genetic heterogeneity of Arab populations as inferred from HLA genes". PLOS ONE. 13 (3): e0192269. Bibcode:2018PLoSO..1392269H. doi:10.1371/journal.pone.0192269. ISSN 1932-6203. PMC 5844529. PMID 29522542.
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  7. ^ IE = Indo-European
  8. ^ First column gives the amount of total Sample Size studied
  9. ^ Second column gives the Percentage of the particular haplogroup among the Sample Size
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Further reading

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  • Teebi AS (2010). Genetic Disorders Among Arab Populations (2nd ed.). Berlin, Heidelberg: Springer. ISBN 978-3-642-43475-4.
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