rs797045219

Positions:

• chrX-148662019-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002025.4(AFF2):​c.292C>A​(p.Pro98Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P98P) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 22)
• Consequence: AFF2 NM_002025.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.42

Genes affected

AFF2 (HGNC:3776): (ALF transcription elongation factor 2) This gene encodes a putative transcriptional activator that is a member of the AF4\FMR2 gene family. This gene is associated with the folate-sensitive fragile X E locus on chromosome X. A repeat polymorphism in the fragile X E locus results in silencing of this gene causing Fragile X E syndrome. Fragile X E syndrome is a form of nonsyndromic X-linked cognitive disability. In addition, this gene contains 6-25 GCC repeats that are expanded to >200 repeats in the disease state. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.901

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AFF2	NM_002025.4	c.292C>A	p.Pro98Thr	missense_variant	3/21	ENST00000370460.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AFF2	ENST00000370460.7	c.292C>A	p.Pro98Thr	missense_variant	3/21	5	NM_002025.4	P1
AFF2	ENST00000342251.7	c.280C>A	p.Pro94Thr	missense_variant	3/20	1
AFF2	ENST00000370457.9	c.292C>A	p.Pro98Thr	missense_variant	3/20	1
AFF2	ENST00000370458.5	c.280C>A	p.Pro94Thr	missense_variant	3/8	1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Sep 11, 2014

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;.;.;.
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.90	D;D;D;D
MetaSVM	Uncertain	0.20	D
MutationAssessor	Pathogenic	2.9	M;.;.;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-6.2	D;D;D;.
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0020	D;D;D;.
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.69
MutPred		0.75		Loss of loop (P = 0.1258);.;.;Loss of loop (P = 0.1258);
MVP		0.84
MPC		0.64
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.81
gMVP		0.69

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

Publications

LitVar

Other links and lift over

dbSNP: rs797045219; hg19: chrX-147743540;