2-197402109-T-C

Position:

• chr2-197402109-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_012433.4(SF3B1):​c.2099A>G​(p.Lys700Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SF3B1 NM_012433.4 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.54

Genes affected

SF3B1 (HGNC:10768): (splicing factor 3b subunit 1) This gene encodes subunit 1 of the splicing factor 3b protein complex. Splicing factor 3b, together with splicing factor 3a and a 12S RNA unit, forms the U2 small nuclear ribonucleoproteins complex (U2 snRNP). The splicing factor 3b/3a complex binds pre-mRNA upstream of the intron's branch site in a sequence independent manner and may anchor the U2 snRNP to the pre-mRNA. Splicing factor 3b is also a component of the minor U12-type spliceosome. The carboxy-terminal two-thirds of subunit 1 have 22 non-identical, tandem HEAT repeats that form rod-like, helical structures. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

SF3B1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a mutagenesis_site Does not affect the stability of the SF3B complex interaction with U2AF65. Does not decrease the affinity to RNA. (size 0) in uniprot entity SF3B1_HUMAN
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SF3B1	NM_012433.4	c.2099A>G	p.Lys700Arg	missense_variant	15/25	ENST00000335508.11	NP_036565.2
SF3B1	XM_047443838.1	c.1661A>G	p.Lys554Arg	missense_variant	12/22		XP_047299794.1
SF3B1	XM_047443839.1	c.1661A>G	p.Lys554Arg	missense_variant	12/22		XP_047299795.1
SF3B1	XM_047443840.1	c.2099A>G	p.Lys700Arg	missense_variant	15/22		XP_047299796.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SF3B1	ENST00000335508.11	c.2099A>G	p.Lys700Arg	missense_variant	15/25	1	NM_012433.4	ENSP00000335321.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Acute myeloid leukemia Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

Oct 02, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Uncertain	0.082	D
BayesDel_noAF	Benign	-0.12
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.57	D
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.062	D
MetaRNN	Uncertain	0.59	D
MetaSVM	Uncertain	0.033	D
MutationAssessor	Uncertain	2.8	M
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-2.9	D
REVEL	Uncertain	0.46
Sift	Benign	0.032	D
Sift4G	Benign	0.10	T
Polyphen		1.0	D
Vest4		0.58
MutPred		0.48		Loss of ubiquitination at K700 (P = 0.0183);
MVP		0.71
MPC		2.0
ClinPred		0.99	D
GERP RS		6.0
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.8
Varity_R		0.71
gMVP		0.58

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: rs1057519756; hg19: chr2-198266833; COSMIC: COSV59221191; COSMIC: COSV59221191;