rs7550829

Positions:

• chr1-17031082-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_003000.3(SDHB):​c.286+1978G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.148 in 151,658 control chromosomes in the GnomAD database, including 2,454 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.15 (2454 hom., cov: 30)
• Consequence: SDHB NM_003000.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.869

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.02).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.303 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHB	NM_003000.3	c.286+1978G>A		intron_variant		ENST00000375499.8
SDHB	NM_001407361.1	c.286+1978G>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHB	ENST00000375499.8	c.286+1978G>A		intron_variant		1	NM_003000.3	P1

Frequencies

GnomAD3 genomes AF: 0.148 AC: 22367 AN: 151542 Hom.: 2449 Cov.: 30

Gnomad AFR AF: 0.308

Gnomad AMI AF: 0.121

Gnomad AMR AF: 0.103

Gnomad ASJ AF: 0.142

Gnomad EAS AF: 0.000194

Gnomad SAS AF: 0.0352

Gnomad FIN AF: 0.0553

Gnomad MID AF: 0.123

Gnomad NFE AF: 0.0951

Gnomad OTH AF: 0.135

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.148 AC: 22395 AN: 151658 Hom.: 2454 Cov.: 30 AF XY: 0.143 AC XY: 10591 AN XY: 74094

Gnomad4 AFR AF: 0.308

Gnomad4 AMR AF: 0.103

Gnomad4 ASJ AF: 0.142

Gnomad4 EAS AF: 0.000389

Gnomad4 SAS AF: 0.0352

Gnomad4 FIN AF: 0.0553

Gnomad4 NFE AF: 0.0951

Gnomad4 OTH AF: 0.133

Alfa AF: 0.102 Hom.: 1956

Bravo AF: 0.159

Asia WGS AF: 0.0320 AC: 113 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	0.17
DANN	Benign	0.42

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs7550829; hg19: chr1-17357577;