rs1553177435
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PM2
The NM_003000.3(SDHB):c.608G>C(p.Gly203Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G203R) has been classified as Uncertain significance.
Frequency
Genomes: not found (cov: 33)
Consequence
SDHB
NM_003000.3 missense
NM_003000.3 missense
Scores
2
8
9
Clinical Significance
Conservation
PhyloP100: 2.63
Genes affected
SDHB (HGNC:10681): (succinate dehydrogenase complex iron sulfur subunit B) This tumor suppressor gene encodes the iron-sulfur protein subunit of the succinate dehydrogenase (SDH) enzyme complex which plays a critical role in mitochondria. The SDH enzyme complex is composed of four nuclear-encoded subunits. This enzyme complex converts succinate to fumarate which releases electrons as part of the citric acid cycle, and the enzyme complex additionally provides an attachment site for released electrons to be transferred to the oxidative phosphorylation pathway. The SDH enzyme complex plays a role in oxygen-related gene regulation through its conversion of succinate, which is an oxygen sensor that stabilizes the hypoxia-inducible factor 1 (HIF1) transcription factor. Sporadic and familial mutations in this gene result in paragangliomas, pheochromocytoma, and gastrointestinal stromal tumors, supporting a link between mitochondrial dysfunction and tumorigenesis. Mutations in this gene are also implicated in nuclear type 4 mitochondrial complex II deficiency. [provided by RefSeq, Jun 2022]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM1
?
In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 16 uncertain in NM_003000.3
PM2
?
Very rare variant in population databases, with high coverage;
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SDHB | NM_003000.3 | c.608G>C | p.Gly203Ala | missense_variant | 6/8 | ENST00000375499.8 | |
SDHB | NM_001407361.1 | c.554G>C | p.Gly185Ala | missense_variant | 6/8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SDHB | ENST00000375499.8 | c.608G>C | p.Gly203Ala | missense_variant | 6/8 | 1 | NM_003000.3 | P1 | |
SDHB | ENST00000491274.6 | c.566G>C | p.Gly189Ala | missense_variant | 6/8 | 5 | |||
SDHB | ENST00000463045.3 | c.437G>C | p.Gly146Ala | missense_variant | 6/8 | 3 | |||
SDHB | ENST00000485515.5 | n.542G>C | non_coding_transcript_exon_variant | 6/7 | 5 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 33
GnomAD4 genome
?
Cov.:
33
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Pheochromocytoma;C0238198:Gastrointestinal stromal tumor;C1861848:Paragangliomas 4 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Feb 28, 2019 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with SDHB-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with alanine at codon 203 of the SDHB protein (p.Gly203Ala). The glycine residue is moderately conserved and there is a small physicochemical difference between glycine and alanine. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
Cadd
Benign
Dann
Benign
DEOGEN2
Uncertain
D;.
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D;D
M_CAP
Uncertain
D
MetaRNN
Uncertain
T;T
MetaSVM
Uncertain
D
MutationAssessor
Benign
L;.
MutationTaster
Benign
D
PrimateAI
Pathogenic
D
PROVEAN
Benign
N;.
REVEL
Uncertain
Sift
Benign
T;.
Sift4G
Benign
T;T
Polyphen
B;.
Vest4
MutPred
Loss of stability (P = 0.1051);.;
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at