NM_012433.4:c.3235A>G

Variant names:

• chr2-197398016-T-C
• NM_012433.4:c.3235A>G

Variant summary

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

The NM_012433.4(SF3B1):​c.3235A>G​(p.Asn1079Asp) 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: 32)
• Consequence: SF3B1 NM_012433.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.83
• Publications: 0 publications found

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]

ACMG classification

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

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_012433.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SF3B1	NM_012433.4	MANE Select	c.3235A>G	p.Asn1079Asp	missense	Exon 22 of 25	NP_036565.2	O75533-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SF3B1	ENST00000335508.11	TSL:1 MANE Select	c.3235A>G	p.Asn1079Asp	missense	Exon 22 of 25	ENSP00000335321.6	O75533-1
	SF3B1	ENST00000929354.1		c.3232A>G	p.Asn1078Asp	missense	Exon 22 of 25	ENSP00000599413.1
	SF3B1	ENST00000929356.1		c.3154A>G	p.Asn1052Asp	missense	Exon 22 of 25	ENSP00000599415.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	SF3B1-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.014	T
BayesDel_noAF	Benign	-0.22
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.60	D
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.046	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Uncertain	-0.21	T
MutationAssessor	Benign	1.3	L
PhyloP100		7.8
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-4.8	D
REVEL	Uncertain	0.43
Sift	Benign	0.089	T
Sift4G	Benign	0.10	T
Polyphen		1.0	D
Vest4		0.75
MutPred		0.41		Loss of MoRF binding (P = 0.0567)
MVP		0.75
MPC		2.6
ClinPred		0.98	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.79
gMVP		0.97
Mutation Taster		=15/85	disease causing

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: chr2-198262740;