rs797045218

Positions:

• chrX-148837693-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002025.4(AFF2):​c.1133C>G​(p.Ala378Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: AFF2 NM_002025.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.26

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17170149).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AFF2	NM_002025.4	c.1133C>G	p.Ala378Gly	missense_variant	5/21	ENST00000370460.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AFF2	ENST00000370460.7	c.1133C>G	p.Ala378Gly	missense_variant	5/21	5	NM_002025.4	P1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 26

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

Jun 15, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	16
DANN	Uncertain	1.0
DEOGEN2	Benign	0.25	T
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.70	T
M_CAP	Uncertain	0.18	D
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	D;D;D;D;N
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-0.94	N
REVEL	Benign	0.11
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.014	D
Polyphen		0.042	B
Vest4		0.27
MutPred		0.57		Loss of catalytic residue at A378 (P = 0.0483);
MVP		0.39
MPC		0.14
ClinPred		0.44	T
GERP RS		5.4
Varity_R		0.32
gMVP		0.35

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: rs797045218; hg19: chrX-147919217;