Multiple Mitochondrial Dysfunctions Syndrome 3; Mmds3

Description

MMDS3 is an autosomal recessive severe neurodegenerative disorder characterized by loss of previously acquired developmental milestones in the first months or years of life. Some affected patients have normal development in early infancy before the onset of symptoms, whereas others show delays from birth. Features included loss of motor function, spasticity, pyramidal signs, loss of speech, and cognitive impairment. The disease course is highly variable: some patients die of respiratory failure early in childhood, whereas some survive but may be bedridden with a feeding tube. Less commonly, some patients may survive and have a stable course with motor deficits and mild or even absent cognitive impairment, although there may be fluctuating symptoms, often in response to infection. Other variable features include visual problems and seizures. Brain imaging shows diffuse leukodystrophy in the subcortical region, brainstem, cerebellum, and spinal cord. Laboratory studies tend to show increased lactate and CSF glycine, and decreased activity of mitochondrial complexes I and II, although these findings are also variable. There may be additional biochemical evidence of mitochondrial dysfunction (summary by Liu et al., 2018).For a general description and a discussion of genetic heterogeneity of multiple mitochondrial dysfunctions syndrome, see MMDS1 (OMIM ).

Clinical Features

Top most frequent phenotypes and symptoms related to Multiple Mitochondrial Dysfunctions Syndrome 3; Mmds3

  • Seizures
  • Global developmental delay
  • Generalized hypotonia
  • Microcephaly
  • Growth delay
  • Nystagmus
  • Failure to thrive
  • Spasticity
  • Cognitive impairment
  • High palate

And another 47 symptoms. If you need more information about this disease we can help you.

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Incidence and onset information

Not enough data available about incidence and published cases.
No data available about the known clinical features onset.

Researches and researchers

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Multiple Mitochondrial Dysfunctions Syndrome 3; Mmds3 Recommended genes panels

Panel Name, Specifity and genes Tested/covered
Hereditary Spastic Paraplegia Exome Panel.

By Genetic Services Laboratory University of Chicago (United States).

RTN2, SACS, SLC16A2, SLC2A1, KDM5C, SPG11, ATL1, SPAST, SPG7, VAMP1, ERLIN2, CAPN1, BSCL2, PNPLA6, ERLIN1, NIPA1, GJC2, EXOSC3, SPART, CPT1C , (...)

View the complete list with 36 more genes
Specificity
2 %
Genes
100 %
Ataxia Exome Panel.

By Genetic Services Laboratory University of Chicago (United States).

BCS1L, RTN2, SACS, SCN1A, SCN2A, SCN8A, SCO1, SDHA, SDHD, SLC16A2, SLC17A5, SLC19A2, SLC1A3, SLC20A2, SLC2A1, SLC6A1, SLC9A1, SLC9A6, SNAP25, SOD1 , (...)

View the complete list with 457 more genes
Specificity
1 %
Genes
100 %
Complex Hereditary Spastic Paraplegia Sequencing Panel with CNV Detection.

By PreventionGenetics PreventionGenetics (United States).

SACS, SLC16A2, KDM5C, SPG11, ATL1, SPAST, SPG7, TFG, UCHL1, USP8, VCP, ERLIN2, CAPN1, BSCL2, CCT5, PNPLA6, NIPA1, RAB3GAP2, BICD2, GJC2 , (...)

View the complete list with 50 more genes
Specificity
2 %
Genes
100 %
Hereditary Spastic Paraplegia Comprehensive Sequencing Panel with CNV Detection.

By PreventionGenetics PreventionGenetics (United States).

RTN2, SACS, SLC16A2, KDM5C, SPG11, ATL1, SPAST, SPG7, TFG, UCHL1, USP8, VCP, ERLIN2, CAPN1, BSCL2, CCT5, PNPLA6, ERLIN1, NIPA1, RAB3GAP2 , (...)

View the complete list with 60 more genes
Specificity
2 %
Genes
100 %
Leukodystrophy and Leukoencephalopathy Sequencing Panel with CNV Detection.

By PreventionGenetics PreventionGenetics (United States).

SCP2, AIMP1, SDHB, SLC16A2, SLC17A5, SLC25A1, SLC25A12, SLC25A4, SOX10, SPG11, SPG7, SUCLA2, SURF1, TWNK, ACOX1, TREX1, TUFM, TYROBP, WARS2, MCOLN1 , (...)

View the complete list with 135 more genes
Specificity
1 %
Genes
100 %
Mitochondrial Oxidative Phosphorylation Deficiency Sequencing Panel (Nuclear Genes Only) with CNV Detection.

By PreventionGenetics PreventionGenetics (United States).

BCS1L, MRPL12, MRPL3, SCO1, SCO2, SDHB, SDHD, SLC25A1, SLC25A3, SLC25A4, SPG7, SUCLA2, SUCLG1, SURF1, TAZ, TWNK, TK2, TSFM, TUFM, UQCRB , (...)

View the complete list with 154 more genes
Specificity
1 %
Genes
100 %
Neurogenetic Disorders - panels.

By MGZ Medical Genetics Center (Germany).

BCS1L, RTN2, RYR1, SACS, SCN1A, SCN1B, SCN2A, SCN8A, SCO1, SCO2, AIMP1, SDHA, SDHB, SDHC, SDHD, SGCE, SLC16A2, SLC17A5, SLC19A2, SLC1A3 , (...)

View the complete list with 572 more genes
Specificity
1 %
Genes
100 %
Epileptic Encephalopathy.

By MGZ Medical Genetics Center (Germany).

SCN1A, SCN1B, SCN2A, SCN8A, SGCE, SLC2A1, SPTAN1, CDKL5, STXBP1, SYNGAP1, SYNJ1, TUBB2A, UBE3A, PCDH19, NPC2, ARHGEF9, GPHN, ARHGEF15, PANK2, PLCB1 , (...)

View the complete list with 69 more genes
Specificity
2 %
Genes
100 %

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Sources and references

You can check the following sources for additional information.

OMIM Rare Disease Search Engine

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