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Clinical Biochemistry of Domestic Animals (Sixth Edition) - UMK ...

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740<br />

Chapter | 24 Lysosomal Storage Diseases<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

N<br />

<strong>Clinical</strong>ly normal male<br />

<strong>Clinical</strong>ly normal female<br />

Mannosidosis<br />

Heterozygous by assay<br />

N<br />

N<br />

Normal by assay<br />

Suspected mannosidosis<br />

Deceased<br />

Sex unknown<br />

FIGURE 24-14 The pedigree <strong>of</strong> a family <strong>of</strong> cats with alpha-mannosidosis.<br />

METABOLIC SCREENING OF URINE SAMPLES FIGURE 24-15 The scheme used to detect<br />

metabolic diseases, including some lysosomal<br />

storage disorders, by examining com-<br />

URINE<br />

pounds present in urine.<br />

SPOT TESTS<br />

PAPER<br />

CHROMATOGRAPHY<br />

THIN LAYER<br />

CHROMATOGRAPHY<br />

MPS spot<br />

Clinitest<br />

ketostix<br />

Nitroprusside Amino acid Organic acid Oligosaccharides<br />

Electrophoresis<br />

Carbohydrate<br />

chromatography<br />

Amino acid<br />

analyzer<br />

GC/Mass<br />

spectroscopy<br />

activity, there is overlap between the ranges for enzyme<br />

activity values from normal and obligate heterozygous<br />

animals ( Fig. 24-17 ). Thus, accurate determination <strong>of</strong><br />

an asymptomatic individual as normal or a carrier may<br />

be difficult with an enzyme assay alone but can best be<br />

achieved by molecular DNA tests for the specific mutation<br />

in those diseases and families where the mutation has been<br />

identified. 2<br />

An animal with clinical signs suspected <strong>of</strong> having an LSD<br />

that dies or requires euthanasia should have a complete postmortem<br />

examination, including the CNS, skeletal, and ocular<br />

2<br />

One such laboratory is the Josephine Deubler Genetic Disease Testing<br />

Laboratory, Section <strong>of</strong> Medical Genetics, Veterinary Hospital <strong>of</strong> the<br />

University <strong>of</strong> Pennsylvania, 3900 Delancy Street, Philadelphia, PA 19104-<br />

6010 ( http://w3.vet.upenn.edu/research/centers/penngen/services ).

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