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Molecular analysis of gene mutations is the standard practice
for diagnosis of many genetic disorders. In contrast to molecular
genetic studies in the past which could only detect mutations
indirectly via linkage, detection of specific alterations at
the DNA level are now discernable. Mutations in disease genes
are detectable using a variety of molecular diagnostic techniques.
The identification of a specific mutation in a proband allows
rapid and accurate testing of other family members for the same
mutation. This information plays a crucial role in genetic counseling
and determination of recurrence risk. With the current growth
of genetic knowledge from the Human Genome Project, molecular
diagnosis of additional disorders will become possible in the
near future.
Analysis in the Molecular Diagnostic Laboratory is typically performed on nucleic acids isolated from peripheral blood, buccal swabs, cultured amniocytes, or cultured chorionic villi samples. Culturing services for
prenatal samples are also available. The Molecular Diagnostic Laboratory at the Greenwood Genetic
Center currently performs testing for the following genetic disorders:
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- Isolated Split
Hand/Foot (p63)
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Jackson-Weiss syndrome (FGFR2)
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LEOPARD syndrome
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Lujan-Fryns syndrome (MED12)
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Medium chain acyl-CoA dehydrogenase
(MCAD)
- MED12-Associated syndromes
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Methylation studies
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Mucolipidoses
II/IIIA
- Myotonic dystrophy
-
Nonsyndromic X-Linked
Mental Retardation Panel
-
Noonan syndrome
-
p63-Related syndromes
(Ectrodactyly-Ectodermal Dyplasia-Clefting, Hay-Wells, Isoalted Split
Hand/Foot)
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Pfeiffer syndrome
(FGFR1/2)
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Phenylketonuria (PKU)
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Pitt-Hopkins syndrome
(TCF4)
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Prader-Willi
syndrome (methylation,
uniparental disomy)
-
Proteus/Proteus-like
syndrome (PTEN)
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PTEN-related syndromes
(Autism w/macrocephaly, Bannayan-Riley-Ruvalcaba, Cowden, Proteus/
Proteus-Like)
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Rett syndrome:
- Rett/Angelman
syndrome 2nd tier panel
-
Russell-Silver syndrome
(Uniparental disomy studies)
-
Saethre-Chotzen syndrome (TWIST gene mutation analysis)
- Sanfilippo syndrome types A
and B
- Sotos syndrome
- Thanatophoric dysplasia types I and II
(FGFR3)
- Thrombosis panel
(Factor V Leiden, prothrombin 20210A, MTHFR)
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UBE3A - Angelman syndrome
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Uniparental Disomy studies
(Chr. 7 - Russell-Silver syn., Chr. 14, Chr. 15 - Prader-Willi/Angelman
syn)
-
VLCAD Deficiency (ACADVL)
- X-inactivation
- X-linked
hydrocephalus (L1CAM)
- XLMR-Nonsyndromic
panel
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