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Genetic Testing

Public Health Impact of Genetic Tests at the End of the 20th Century
by Paula W. Yoon,

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Tables

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TABLE 1: Inherited diseases with genetic tests used in clinical practice that were classified as having more public health impact: Newborn screening

Disease
Gene(s)
Mode of inheritancea
Population prevalence
Incidence or birth prevalence
Biotinidase deficiency
BTD
AR
1.6/100,000
Congenital adrenal hyperplasia
CYP21A2 (CYP21)
AR
6.7/100,000
Congenital hypothyroidism
FOXE1 (FKHL15), FKHL15,
PAX8, TSHR
AR
1/50,000
Cystic fibrosis
ABCC7 (CFTR)
AR
1/3,900 (white); 1/17,000 (black)
Fatty acid oxidation disorder
unspecified
ACADM, HADHB,
ACADVL, ACADS
AR
Rare
Galactokinase deficiency
GALK1
AR
1/50,000–1/100,000
Galactosemia
GALE, GALT
AR
1/30,000
Glucose-6-phosphate dehydrogenase
deficiency
G6PD (many variants)
XL
10% American black males
Glutaricacidemia type I
GCDH
AR
Rare
Glutaricacidemia type II
ETFA, ETFB, ETFDH
AR
Rare
Hemoglobin C; sickle cell disease
HBB
AR
1/835 (African American)
Hemoglobin S; sickle cell disease
HBB
AR
1/375 (African American); 1/100,000 (white)
Homocystinuria
CBS
AR
1/200,000–1/335,000
Maple syrup urine disease (MSUD)
BCKDHA, BCKDHB, DBT
AR
1/185,000
1/176 (Mennonite)
Medium chain acyl-coenzyme A
dehydrogenase deficiency (MCAD)
ACADM
AR
1/10,000
Propionic acidemia
PCCA, PCCB
AR
Rare
Short chain acyl-coA dehydrogenase
deficiency (SCAD)
ACADS
AR
Rare
Very long chain acyl-coA
dehydrogenase deficiency (VLCAD)
ACADVL
AR
Rare
Long chain 3-hydroxyacyl coA
dehydrogenase (LCHAD)
HADHA, HADHB
AR
1/50,000

Note: The prevalence figures come from many sources, and although they appeared to be the best estimate available, their accuracy could not be validated.
a Mode of inheritance: AR, autosomal recessive; XL, X linked.

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TABLE 2: Inherited diseases with genetic tests used in clinical practice that were classified as having more public health impact: Other population screening

Disease
Gene(s)
Mode of inheritancea
Population prevalence
Incidence or birth prevalence
Alkaptonuria
HGD
AR
4/100,000
α thalassemia
HBA1, HBA, HBZ
AR
Significant in Southeast Asian populations
β thalassemia
HBB
AR
Carrier prevalence of 12–14% in
Mediterranean populations
Bloom syndrome
BLM
AR
Rare (screening for Ashkenazi)
Canavan disease
ASPA
AR
15.6/100,000 (Ashkenazi)
Down syndrome critical region
DCR
AR
1/800
Gaucher disease
GBA
AR
1/600–2,500
Niemann-Pick disease due to
sphingomylinase
SMPD1(ASM)
AR
1/40,000 (Ashkenazi)
Tay-Sachs disease
HEXA
AR
1/3,600
(Ashkenazi)

Note: The prevalence figures come from many sources, and although they appeared to be the best estimate available, their accuracy could not be validated.
a Mode of inheritance: AR, autosomal recessive; AL, autosomal loci not specified.

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TABLE 3: Inherited diseases with genetic tests used in clinical practice that were classified as having more public health impact: Common diseases (>1/2,000 prevalence)

Disease
Gene(s)
Mode of inheritancea
Population prevalence
Incidence or birth prevalence
Azoospermia (Y chromosome microdeletion panel)
AZF1, AZF2, DAZ,
RBMY1A1(RBM1|RBM2|
YRRM1)
YL
20% of men who seek help at infertility clinics present with nonobstructive oligospermia or azoospermia
BRCA1 hereditary breast cancer
BRCA1
AD
10–20/10,000
BRCA2 hereditary breast cancer
BRCA2
AD
5–10/10,000
Congenital bilateral absence of the vas deferens
ABCC7 (CFTR)
AR
2% of men with obstructive
azoospermia
Coronary artery disease risk factor (ACE)
ACE
AD
CAD is leading cause of death in the
United States
Coronary artery disease risk factor (PLA1/2)
ITGB3
AD
As above
Diabetes mellitus, non–insulin-dependent
GPD2, MAPK8IP1, IB1, PPAR-gamma
AD
6/1,000
Factor V Leiden thrombophilia
F5
AD
1/1,000 symptomatic venous thrombosis
Familial adenomatous polyposis (APC)
APC
AD
6/100 (Ashkenazi)
Familial colorectal cancer
APC
AD
134,000 new cases of colorectal cancer in
US in 1996
Familial combined hyperlipidemia
APOE
AD
2/1,000
Fragile X syndrome (FMR1)
FMR1 (FRAXA)
XL
1/1,250 (males); 1/2,500 (females)
Hereditary hemochromatosis (HFE)
HFE
AR
3/1,000
Hereditary nonpolyposis colon cancer
MLH1, MSH2, MSH6, PMS1, PMS2, TGFBR2
AL
2/1,000
Late-onset familial Alzheimer disease
AD5, APOE
AD
10% of persons >70 years have significant memory loss and >50% of these have Alzheimer disease
MTHFR thermolabile variant
MTHFR
AR
30–40% of French Canadians
Multiple endocrine neoplasia type I (MEN1)
MEN1
AD
100,000 in US develop hyperparathyroidism
Nonsyndromic hereditary hearing loss and deafness (connexin 26)
GJB2 (CX26|DFNA3| DFNB1)
AL
1/1,000 for hearing loss with 50% being
syndromic, leaving 50% for potential
testing
Nonsyndromic hereditary hearing loss and deafness
(mitochondrial)
MTRNR1, MTTS1
MT
As above
Oculopharyngeal muscular dystrophy
PABP2
AL
1/1,000 in some ethnic groups
Polycystic kidney disease, dominant
PKD1, PKD2, PKD3
AD
1/400–1/1,000
Preeclampsia
AGT, PEE1
AD
Affects 2–4% of pregnancies
Prothrombin G20210A thrombophilia
F2
AD
1/1,000 symptomatic venous thrombosis

Note: The prevalence figures come from many sources, and although they appeared to be the best estimate available, their accuracy could not be validated.
a Mode of inheritance: AD, autosomal dominant; AR, autosomal recessive; XL, X linked; YL, Y linked; AL, autosomal loci not specified; MT, mitochondrial.

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TABLE 4: Inherited diseases with genetic tests used in research that would be classified as having more public health impact if used clinically

Disease
Gene(s)
Mode of inheritancea
Population prevalence
Incidence or birth prevalence
Abdominal aortic
aneurysm
COL3A1
AD
150/10,000 (males > 50 years)
Alcoholism
Unknown
AD
14 million Americans abuse alcohol or are
alcoholics
Bipolar disorder
MAFD1
AL
1–2% population
Diabetes mellitus, MODY
types 5, 4, 3, 2, 1
TCF2 (HNF1 beta), IPF1, TCF1
(HNF1A), GCK, HNF4A
AR
1 million+ people in US diagnosed
Factor XI deficiency
F11
AD
1/190 (Ashkanazi)
Familial
hypercholesterolemia
APOBLDLR
AD
1/500 (heterozygotes)
1/1,000,000 (homozygotes)
Familial
hyperparathyroidism
HRPT2, MEN1
AD
1/1,000
Glaucoma, dominant
(adult onset)
GLC1B, GLC1C, GLC1D,
GLC1E, GLC1F
AL
Age-dependent:
0.5% in 60s
3% in 70s
14% ≥80
Multiple sclerosis
MS
AD
2,500,000 (worldwide)
Neural tube defect
Unknown
AD
1/1,000
Noonan syndrome
NS1
AD
1/1,000 worldwide
Oculocutaneous albinism
TYR, OCA2(P), TYRP1
AR
1/20,000 in most populations, giving a
heterozygote frequency of 1/70
1/10,000 in African Americans, 1/
227–240 in some Amerindian
populations
Otosclerosis
OTSC1
AD
1/330 (Caucasians); 1/3,300 (African Americans)
Parkinson disease
SNCA (PARK1)
AD
10–35/10,000
Premature ovarian failure
DIAPH2 (POF1)
AD or XL
1% of women <40 years
Prostate cancer
HPC1, HPCX, PCAP (HPC2)
AL or XL
100,000+ cases in US per year
Psoriasis
PSORS1, PSORS2, PSORS3
AD
1–2% of population
Schizophrenia
SCZD1-7
AL
1% of the population develops schizophrenia
during their lifetime

Note: The prevalence figures come from many sources, and although they appeared to be the best estimate available, their accuracy could not be validated.
a Mode of inheritance: AD, autosomal dominant; AR, autosomal recessive; XL, X linked; AL, autosomal loci not specified.

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  Last Updated March 04, 2008