GM05168

GM05168 LCL from B-Lymphocyte

Description:

CHARCOT-MARIE-TOOTH DISEASE, TYPE 1A; CMT1A
PERIPHERAL MYELIN PROTEIN 22; PMP22

Affected:

Yes

Sex:

Female

Age:

28 YR (At Sampling)

Overview

Repository

NIGMS Human Genetic Cell Repository

Subcollection

Heritable Diseases

Biopsy Source

Peripheral vein

Cell Type

B-Lymphocyte

Tissue Type

Blood

Transformant

Epstein-Barr Virus

Sample Source

LCL from B-Lymphocyte

Race

White

Family Member

Relation to Proband

proband

Confirmation

Clinical summary/Case history

Species

Homo sapiens

Common Name

Human

Remarks

Clinically affected; high arches of feet; difficulty with running as a teenager; marked equinus deformity of the foot with early hammer toes; marked weakness of the foot extensors; mildly reduced sensation to pin and light touch; walks with slight steppage gait; normal strength in bulk in upper extremities; normal strength of psoas, quadriceps, hamstrings, and gastrocnemius muscles; no palpably enlarged nerves noted peripherally; affected father is GM05166; EMG performed at age 28 was "compatible with a rather significant polyneuropathic process of a primary demyelinating type. The findings would be consistent with a clincial suspected diagnosis of Charcot-Marie-Tooth disease."; see GM05167 fibroblast; donor subject was found to have a duplication (17p) of the PMP22 gene by MLPA; no mutations were found in the MPZ gene; donor subject also has a homozygous polymorphism: IVS3+64T>C (rs6674383)

Characterizations

IDENTIFICATION OF SPECIES OF ORIGIN

Species of Origin Confirmed by LINE assay

Gene

PMP22

Chromosomal Location

17p11.2

Allelic Variant 1

601097.0001; CHARCOT-MARIE-TOOTH DISEASE, TYPE 1A

Identified Mutation

DUP (17p); Lupski et al [Cell 66: 219 (1991)] found a DNA duplication as the apparent basis of CMT1A [Charcot-Marie-Tooth Disease, Type 1a (118220)]. The duplication was demonstrated in locus D17S122 (probe VAW409R3).