X-148885517-C-G

Variant names:

• chrX-148885517-C-G
• rs758440
• NM_002025.4:c.1263-372C>G

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_002025.4(AFF2):​c.1263-372C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., 0 hem., cov: 22)
  • Failed GnomAD Quality Control
• Consequence: AFF2 NM_002025.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.297
• Publications: 1 publications found

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]

AFF2 Gene-Disease associations (from GenCC):

• FRAXE intellectual disability

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• non-syndromic X-linked intellectual disability

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AFF2	NM_002025.4	c.1263-372C>G		intron_variant	Intron 7 of 20	ENST00000370460.7	NP_002016.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AFF2	ENST00000370460.7	c.1263-372C>G		intron_variant	Intron 7 of 20	5	NM_002025.4	ENSP00000359489.2

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 109639 Hom.: 0 Cov.: 22

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 109698 Hom.: 0 Cov.: 22 AF XY: 0.00 AC XY: 0 AN XY: 31976

African (AFR) AF: 0.00 AC: 0 AN: 30267

American (AMR) AF: 0.00 AC: 0 AN: 10225

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2610

East Asian (EAS) AF: 0.00 AC: 0 AN: 3410

South Asian (SAS) AF: 0.00 AC: 0 AN: 2499

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5730

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 211

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 52598

Other (OTH) AF: 0.00 AC: 0 AN: 1485

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	9.3
DANN	Benign	0.70
PhyloP100		0.30

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: rs758440; hg19: chrX-147967047;