NM_006842.3:c.28A>G

Variant names:

• chr11-66052412-A-G
• NM_006842.3:c.28A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_006842.3(SF3B2):​c.28A>G​(p.Lys10Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,588 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SF3B2 NM_006842.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.31
• 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]

ACMG classification

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

• PM1: In a cross_link Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in SUMO2) (size 0) in uniprot entity SF3B2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20552656).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SF3B2	NM_006842.3	c.28A>G	p.Lys10Glu	missense_variant	Exon 1 of 22	ENST00000322535.11	NP_006833.2
SF3B2	XM_005273726.5	c.28A>G	p.Lys10Glu	missense_variant	Exon 1 of 22		XP_005273783.1
SF3B2	XM_011544740.4	c.28A>G	p.Lys10Glu	missense_variant	Exon 1 of 22		XP_011543042.1
SF3B2	XM_017017144.3	c.28A>G	p.Lys10Glu	missense_variant	Exon 1 of 22		XP_016872633.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SF3B2	ENST00000322535.11	c.28A>G	p.Lys10Glu	missense_variant	Exon 1 of 22	1	NM_006842.3	ENSP00000318861.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460588 Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2 AN XY: 726570

African (AFR) AF: 0.00 AC: 0 AN: 33442

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26124

East Asian (EAS) AF: 0.00 AC: 0 AN: 39672

South Asian (SAS) AF: 0.00 AC: 0 AN: 86226

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52938

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5338

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111818

Other (OTH) AF: 0.00 AC: 0 AN: 60314

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jun 26, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.28A>G (p.K10E) alteration is located in exon 1 (coding exon 1) of the SF3B2 gene. This alteration results from a A to G substitution at nucleotide position 28, causing the lysine (K) at amino acid position 10 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Uncertain	0.044	T
BayesDel_noAF	Benign	-0.17
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.011	T;T;T;.;.
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Uncertain	0.88	D;D;D;D;T
M_CAP	Benign	0.026	D
MetaRNN	Benign	0.21	T;T;T;T;T
MetaSVM	Benign	-0.74	T
MutationAssessor	Benign	0.69	.;N;.;.;.
PhyloP100		2.3
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-0.40	N;N;N;N;N
REVEL	Benign	0.19
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Benign	0.077	T;T;T;T;T
Polyphen		0.96, 0.88	.;P;.;P;.
Vest4		0.38
MutPred		0.17		Loss of ubiquitination at K10 (P = 0.0019);Loss of ubiquitination at K10 (P = 0.0019);Loss of ubiquitination at K10 (P = 0.0019);Loss of ubiquitination at K10 (P = 0.0019);.;
MVP		0.45
MPC		0.88
ClinPred		0.87	D
GERP RS		5.1
PromoterAI		0.054	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.42
gMVP		0.42
Mutation Taster		=86/14	polymorphism

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

Other links and lift over

hg19: chr11-65819883;