22-30338880-T-A

Variant names:

• chr22-30338880-T-A
• rs145469758
• NM_005877.6:c.1652A>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005877.6(SF3A1):​c.1652A>T​(p.Asn551Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N551S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SF3A1 NM_005877.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.64
• Publications: 0 publications found

Genes affected

SF3A1 (HGNC:10765): (splicing factor 3a subunit 1) This gene encodes a subunit of the splicing factor 3a protein complex. The splicing factor 3a heterotrimer is a component of the mature U2 small nuclear ribonucleoprotein particle (snRNP). U2 small nuclear ribonucleoproteins play a critical role in spliceosome assembly and pre-mRNA splicing. [provided by RefSeq, Aug 2014]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14985761).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005877.6. 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
	SF3A1	NM_005877.6	MANE Select	c.1652A>T	p.Asn551Ile	missense	Exon 11 of 16	NP_005868.1	Q15459-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SF3A1	ENST00000215793.13	TSL:1 MANE Select	c.1652A>T	p.Asn551Ile	missense	Exon 11 of 16	ENSP00000215793.7	Q15459-1
	SF3A1	ENST00000872797.1		c.1604A>T	p.Asn535Ile	missense	Exon 11 of 16	ENSP00000542856.1
	SF3A1	ENST00000872796.1		c.1340A>T	p.Asn447Ile	missense	Exon 9 of 14	ENSP00000542855.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461894 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.090
BayesDel_addAF	Benign	-0.099	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	19
DANN	Benign	0.96
DEOGEN2	Benign	0.10	T
Eigen	Benign	-0.042
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.5	L
PhyloP100		1.6
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-0.68	N
REVEL	Benign	0.099
Sift	Benign	0.059	T
Sift4G	Benign	0.16	T
Polyphen		0.23	B
Vest4		0.55
MutPred		0.21		Loss of solvent accessibility (P = 0.0151)
MVP		0.43
MPC		1.0
ClinPred		0.54	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.18
gMVP		0.59
Mutation Taster		=59/41	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

dbSNP: rs145469758; hg19: chr22-30734869;