SUMMARY:
Whole exome sequencing can be a useful tool in diagnosing complex multigenic and phenotypically overlapping genetic disorders such as Charcot-Marie-Tooth disease (CMT) and spastic ataxia of Charlevoix-Saguenay type.
TITLE:
Novel Variants in MPV17, PRX, GJB1 , and SACS Cause Charcot-Marie-Tooth and Spastic Ataxia of Charlevoix-Saguenay Type Diseases
DESCRIPTION:
Charcot-Marie-Tooth disease (CMT) and autosomal recessive spastic ataxia of Charlevoix-Saguenay type (ARSACS) are large heterogeneous groups of sensory, neurological genetic disorders characterized by sensory neuropathies, muscular atrophies, abnormal sensory conduction velocities, and ataxia. CMT2EE (OMIM: 618400) is caused by mutations in MPV17 (OMIM: 137960), CMT4F (OMIM: 614895) is caused by PRX (OMIM: 605725), CMTX1 (OMIM: 302800) is caused by mutations in GJB1 (OMIM: 304040), and ARSACS…
CONTENT:
Genes (Basel). 2023 Jan 27;14(2):328. doi: 10.3390/genes14020328.
ABSTRACT
Charcot-Marie-Tooth disease (CMT) and autosomal recessive spastic ataxia of Charlevoix-Saguenay type (ARSACS) are large heterogeneous groups of sensory, neurological genetic disorders characterized by sensory neuropathies, muscular atrophies, abnormal sensory conduction velocities, and ataxia. CMT2EE (OMIM: 618400) is caused by mutations in MPV17 (OMIM: 137960), CMT4F (OMIM: 614895) is caused by PRX (OMIM: 605725), CMTX1 (OMIM: 302800) is caused by mutations in GJB1 (OMIM: 304040), and ARSACS (OMIM: 270550) is caused by mutations in SACS (OMIM: 604490). In this study, we enrolled four families: DG-01, BD-06, MR-01, and ICP-RD11, with 16 affected individuals, for clinical and molecular diagnoses. One patient from each family was analyzed for whole exome sequencing and Sanger sequencing was done for the rest of the family members. Affected individuals of families BD-06 and MR-01 show complete CMT phenotypes and family ICP-RD11 shows ARSACS type. Family DG-01 shows complete phenotypes for both CMT and ARSACS types. The affected individuals have walking difficulties, ataxia, distal limb weakness, axonal sensorimotor neuropathies, delayed motor development, pes cavus, and speech articulations with minor variations. The WES analysis in an indexed patient of family DG-01 identified two novel variants: c.83G>T (p.Gly28Val) in MPV17 and c.4934G>C (p.Arg1645Pro) in SACS . In family ICP-RD11, a recurrent mutation that causes ARSACS, c.262C>T (p.Arg88Ter) in SACS , was identified. Another novel variant, c.231C>A (p.Arg77Ter) in PRX , which causes CMT4F, was identified in family BD-06. In family MR-01, a hemizygous missense variant c.61G>C (p.Gly21Arg) in GJB1 was identified in the indexed patient. To the best of our knowledge, there are very few reports on MPV17 , SACS , PRX , and GJB1 causing CMT and ARSACS phenotypes in the Pakistani population. Our study cohort suggests that whole exome sequencing can be a useful tool in diagnosing complex multigenic and phenotypically overlapping genetic disorders such as Charcot-Marie-Tooth disease (CMT) and spastic ataxia of Charlevoix-Saguenay type.
PMID:36833258 | DOI:10.3390/genes14020328
SOURCE:
Genes
TAGS:
Whole exome sequencing
CATEGORY:
Research
SUBCATEGORY:
n/a
DATE – PUBLISHED:
2023-01-30T11:43:26Z
DATE – DOI: 2023-01-30T11:43:26Z
DATE – PUBMED: 2023 Jan 27
DATE OUTPUT MATCHED: True
DATE – ADDED:
Sat, 25 Feb 2023 06:00:00 -0500
DATE – RETRIEVED:
02/25/23 11:05AM
2023-02-25T11:05:14-05:00
FEATURED IMAGE:
Media Uploaded (image/png)
IDENTIFIER:
pmid:36833258,doi:10.3390/genes14020328
PUBMED ID:
pubmed:36833258
DOI:
10.3390/genes14020328
LINK – PUBMED:
https://pubmed.ncbi.nlm.nih.gov/36833258/
LINK – DOI:
https://doi.org/10.3390/genes14020328
LINK – PUBLISHER:
https://www.mdpi.com/2073-4425/14/2/328
REFERENCES:
CMT Treatment Report, Urgent Research, 2023-02-25T11:05:14-05:00, https://www.cmttreatmentreport.com.