chr19-55669177-C-A

Variant names:

• chr19-55669177-C-A
• rs1305696982
• NM_007279.3:c.1040C>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_007279.3(U2AF2):​c.1040C>A​(p.Pro347His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000889 in 1,461,502 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: U2AF2 NM_007279.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.00700
• Publications: 0 publications found

Genes affected

U2AF2 (HGNC:23156): (U2 small nuclear RNA auxiliary factor 2) U2 auxiliary factor (U2AF), comprised of a large and a small subunit, is a non-snRNP protein required for the binding of U2 snRNP to the pre-mRNA branch site. This gene encodes the U2AF large subunit which contains a sequence-specific RNA-binding region with 3 RNA recognition motifs and an Arg/Ser-rich domain necessary for splicing. The large subunit binds to the polypyrimidine tract of introns early during spliceosome assembly. Multiple transcript variants have been detected for this gene, but the full-length natures of only two have been determined to date. [provided by RefSeq, Jul 2008]

U2AF2 Gene-Disease associations (from GenCC):

• developmental delay, dysmorphic facies, and brain anomalies

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics

ENSG00000267523 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 7 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 4.7134 (above the threshold of 3.09). Trascript score misZ: 6.409 (above the threshold of 3.09). GenCC associations: The gene is linked to developmental delay, dysmorphic facies, and brain anomalies.
• BP4: Computational evidence support a benign effect (MetaRNN=0.08303881).
• BS2: High AC in GnomAdExome4 at 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
U2AF2	NM_007279.3	c.1040C>A	p.Pro347His	missense_variant	Exon 10 of 12	ENST00000308924.9	NP_009210.1
U2AF2	XM_011526410.2	c.728C>A	p.Pro243His	missense_variant	Exon 11 of 13		XP_011524712.1
U2AF2	XM_047438120.1	c.548C>A	p.Pro183His	missense_variant	Exon 7 of 9		XP_047294076.1
U2AF2	NM_001012478.2	c.1032+8C>A		splice_region_variant, intron_variant	Intron 10 of 11		NP_001012496.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
U2AF2	ENST00000308924.9	c.1040C>A	p.Pro347His	missense_variant	Exon 10 of 12	1	NM_007279.3	ENSP00000307863.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000401 AC: 1 AN: 249524 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000888

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000889 AC: 13 AN: 1461502 Hom.: 0 Cov.: 36 AF XY: 0.00000413 AC XY: 3 AN XY: 727030

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44698

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26116

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86222

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53276

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.0000108 AC: 12 AN: 1111880

Other (OTH) AF: 0.0000166 AC: 1 AN: 60376

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000386 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

May 15, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1040C>A (p.P347H) alteration is located in exon 10 (coding exon 10) of the U2AF2 gene. This alteration results from a C to A substitution at nucleotide position 1040, causing the proline (P) at amino acid position 347 to be replaced by a histidine (H). 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	0.16
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	19
DANN	Benign	0.90
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.49
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.39	T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.083	T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.2	L
PhyloP100		-0.0070
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.060	N
REVEL	Benign	0.074
Sift	Benign	0.43	T
Sift4G	Benign	0.17	T
Polyphen		0.30	B
Vest4		0.17
MutPred		0.29		Loss of glycosylation at P347 (P = 0.0489);
MVP		0.068
MPC		1.5
ClinPred		0.067	T
GERP RS		-0.76
Varity_R		0.042
gMVP		0.38
Mutation Taster		=96/4	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1305696982; hg19: chr19-56180543; COSMIC: COSV100454159; COSMIC: COSV100454159;