Multiple Mitochondrial Dysfunctions Syndrome 2 With Hyperglycinemia; Mmds2

Description

Multiple mitochondrial dysfunctions syndrome-2 (MMDS2) with hyperglycinemia is a severe autosomal recessive disorder characterized by developmental regression in infancy. Affected children have an encephalopathic disease course with seizures, spasticity, loss of head control, and abnormal movement. Additional more variable features include optic atrophy, cardiomyopathy, and leukodystrophy. Laboratory studies show increased serum glycine and lactate. Most patients die in childhood. The disorder represents a form of 'variant' nonketotic hyperglycinemia and is distinct from classic nonketotic hyperglycinemia (NKH, or GCE; {605899}), which is characterized by significantly increased CSF glycine. Several forms of 'variant' NKH, including MMDS2, appear to result from defects of mitochondrial lipoate biosynthesis (summary by Baker et al., 2014).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 2 With Hyperglycinemia; Mmds2

  • Seizures
  • Global developmental delay
  • Generalized hypotonia
  • Ataxia
  • Spasticity
  • Flexion contracture
  • Visual impairment
  • Hepatomegaly
  • Optic atrophy
  • Respiratory distress

And another 20 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 2 With Hyperglycinemia; Mmds2 Recommended genes panels

Panel Name, Specifity and genes Tested/covered
MitoMetĀ®Plus aCGH Analysis.

By Baylor Miraca Genetics Laboratories (United States).

RGS9, RHO, GRK1, RLBP1, RNASEL, BCS1L, RP1, RP2, RP9, RPE65, RPGR, RPL35A, MRPL3, RPS14, RS1, SAG, SARDH, SCO2, SCP2, SDHB , (...)

View the complete list with 612 more genes
Specificity
1 %
Genes
100 %
Multiple Mitochondrial Dysfunctions Syndrome 2 - BOLA3 Sequencing.

By Children's Hospital Colorado Molecular Genetics Laboratory Children's Hospital Colorado (United States).

BOLA3
Specificity
100 %
Genes
100 %
Multiple Mitochondrial Dysfunctions Syndrome 2 - BOLA3 Del/dup Analysis.

By Children's Hospital Colorado Molecular Genetics Laboratory Children's Hospital Colorado (United States).

BOLA3
Specificity
100 %
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 %
Mitochondrial Diseases.

By MGZ Medical Genetics Center (Germany).

BCS1L, SCO1, SCO2, SDHA, SDHB, SDHC, SDHD, SLC19A2, SLC22A5, SLC25A12, SLC25A3, SLC25A4, SLC6A8, SPG7, SUCLA2, SUCLG1, SURF1, TAZ, TWNK, TIMM8A , (...)

View the complete list with 148 more genes
Specificity
1 %
Genes
100 %
Mitochondrial Encephalopathy.

By MGZ Medical Genetics Center (Germany).

BCS1L, SCO1, SCO2, SDHA, SDHB, SDHC, SDHD, SLC19A2, SLC25A12, SLC25A3, SLC25A4, SLC6A8, SPG7, SUCLA2, SUCLG1, SURF1, TAZ, TWNK, TIMM8A, TK2 , (...)

View the complete list with 111 more genes
Specificity
1 %
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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