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m.3242G>A AND Myelodysplastic syndrome

Germline classification:
Pathogenic (1 submission)
Last evaluated:
Jun 11, 2010
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of clinical impact:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:
current
Accession:
RCV000010223.6

Allele description [Variation Report for m.3242G>A]

m.3242G>A

Gene:
MT-TL1:mitochondrially encoded tRNA leucine 1 (UUA/G) [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Genomic location:
Preferred name:
m.3242G>A
HGVS:
  • NC_012920.1:m.3242G>A
  • NC_012920.1:g.3242G>A
Nucleotide change:
3242G-A
Links:
OMIM: 590050.0012; dbSNP: rs193303018
NCBI 1000 Genomes Browser:
rs193303018

Condition(s)

Name:
Myelodysplastic syndrome (MDS)
Synonyms:
MYELODYSPLASTIC SYNDROME, SUSCEPTIBILITY TO; Myelodysplastic syndrome, somatic; Myelodysplastic syndromes
Identifiers:
MONDO: MONDO:0018881; MeSH: D009190; MedGen: C3463824; Orphanet: 52688; OMIM: 614286

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
OriginMethodCitations
SCV000030447OMIM
no assertion criteria provided
Pathogenic
(Jun 11, 2010)
somaticliterature only

PubMed (2)
[See all records that cite these PMIDs]

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedsomaticnot providednot providednot providednot providednot providednot providedliterature only

Citations

PubMed

Ineffective hematopoiesis linked with a mitochondrial tRNA mutation (G3242A) in a patient with myelodysplastic syndrome.

Gattermann N, Wulfert M, Junge B, Germing U, Haas R, Hofhaus G.

Blood. 2004 Feb 15;103(4):1499-502. Epub 2003 Oct 23.

PubMed [citation]
PMID:
14576046

Helix unwinding and base flipping enable human MTERF1 to terminate mitochondrial transcription.

Yakubovskaya E, Mejia E, Byrnes J, Hambardjieva E, Garcia-Diaz M.

Cell. 2010 Jun 11;141(6):982-93. doi: 10.1016/j.cell.2010.05.018.

PubMed [citation]
PMID:
20550934
PMCID:
PMC2887341

Details of each submission

From OMIM, SCV000030447.3

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedliterature only PubMed (2)

Description

Ultrastructural abnormalities seen in mitochondria of bone marrow cells of patients with myelodysplastic syndrome (MDS), such as pathologic iron accumulation in the mitochondria of erythroblasts, suggest that mitochondrial dysfunction may contribute to the pathophysiology of MDS. In a 65-year-old male patient with refractory anemia with excess blasts (RAEB), Gattermann et al. (2004) identified a novel somatic mutation of the mitochondrial MTTL1 gene, 3242G-A. Heteroduplex analysis indicated that 40 to 50% of mitochondrial DNA molecules in the bone marrow carried the mutation. The mutation was not detectable by heteroduplex analysis in the peripheral blood. However, peripheral blood CD34+ cells showed the mutation with a proportion of approximately 50%. In hematopoietic colony assays, CD34+ cells from bone marrow and peripheral blood yielded only colonies with wildtype mtDNA; this result indicated that the mtDNA mutation in CD34+ cells was associated with a maturation defect. Mitochondrial tRNA mutations impair mitochondrial protein synthesis, thereby causing dysfunction of the mitochondrial respiratory chain. Gattermann et al. (2004) suggested that this effect contributed to ineffective hematopoiesis in the patient.

Yakubovskaya et al. (2010) found that 3242G interacted with arg251 of MTERF1 (602318) and that the 3242G-A mutation profoundly reduced transcriptional termination by MTERF1.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1somaticnot providednot providednot providednot providednot providednot providednot providednot provided

Last Updated: Dec 11, 2022