chr11-66059591-A-G

Variant names:

• chr11-66059591-A-G
• NM_006842.3:c.1397A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_006842.3(SF3B2):​c.1397A>G​(p.Lys466Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: SF3B2 NM_006842.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.40
• Publications: 0 publications found

Genes affected

SF3B2 (HGNC:10769): (splicing factor 3b subunit 2) This gene encodes subunit 2 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. Subunit 2 associates with pre-mRNA upstream of the branch site at the anchoring site. Subunit 2 also interacts directly with subunit 4 of the splicing factor 3b complex. Subunit 2 is a highly hydrophilic protein with a proline-rich N-terminus and a glutamate-rich stretch in the C-terminus. [provided by RefSeq, Jul 2008]

ENSG00000255038 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SF3B2	NM_006842.3	c.1397A>G	p.Lys466Arg	missense_variant	Exon 12 of 22	ENST00000322535.11	NP_006833.2
SF3B2	XM_005273726.5	c.1394A>G	p.Lys465Arg	missense_variant	Exon 12 of 22		XP_005273783.1
SF3B2	XM_011544740.4	c.1394A>G	p.Lys465Arg	missense_variant	Exon 12 of 22		XP_011543042.1
SF3B2	XM_017017144.3	c.1391A>G	p.Lys464Arg	missense_variant	Exon 12 of 22		XP_016872633.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SF3B2	ENST00000322535.11	c.1397A>G	p.Lys466Arg	missense_variant	Exon 12 of 22	1	NM_006842.3	ENSP00000318861.6

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

SF3B2-related disorder Uncertain:1

Sep 21, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SF3B2 c.1397A>G variant is predicted to result in the amino acid substitution p.Lys466Arg. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.13
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.42	T;D
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.0071	T
MetaRNN	Uncertain	0.65	D;D
MetaSVM	Benign	-0.43	T
MutationAssessor	Uncertain	2.7	.;M
PhyloP100		8.4
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Uncertain	0.36
Sift	Uncertain	0.016	D;D
Sift4G	Uncertain	0.022	D;D
Polyphen		0.51	.;P
Vest4		0.69
MutPred		0.38		.;Loss of ubiquitination at K466 (P = 0.0155);
MVP		0.63
MPC		1.2
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.66
gMVP		0.79
Mutation Taster		=55/45	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

hg19: chr11-65827062;