Genetic Variant AFF2:c.-434_-414dupCGCCGCCGCCGCCGCCGCCGC (chrX-148500637-T-TGCCGCCGCCGCCGCCGCCGCC) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1BS2

The NM_002025.4(AFF2):c.-434_-414dupCGCCGCCGCCGCCGCCGCCGC variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.014 ( 61 hom., 140 hem., cov: 0)

Exomes 𝑓: 0.0 ( 0 hom. 0 hem. )

Failed GnomAD Quality Control

Consequence

AFF2
NM_002025.4 5_prime_UTR

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.80

Publications

1 publications found

Variant links:

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

AFF2 links:

ENSG00000237741 (HGNC:):

ENSG00000237741 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0142 (1035/73114) while in subpopulation AFR AF = 0.0204 (402/19694). AF 95% confidence interval is 0.0188. There are 61 homozygotes in GnomAd4. There are 140 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 61 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AFF2	NM_002025.4 link	c.-434_-414dupCGCCGCCGCCGCCGCCGCCGC		5_prime_UTR_variant	Exon 1 of 21	ENST00000370460.7	NP_002016.2	P51816-1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
AFF2	ENST00000370460.7 link	c.-434_-414dupCGCCGCCGCCGCCGCCGCCGC	5_prime_UTR_variant	Exon 1 of 21	5	NM_002025.4	ENSP00000359489.2	P51816-1
AFF2	ENST00000342251.7 link	c.-461_-460insGCCGCCGCCGCCGCCGCCGCC	upstream_gene_variant		1		ENSP00000345459.4	P51816-3
ENSG00000237741	ENST00000456981.1 link	n.-43_-23dupGGCGGCGGCGGCGGCGGCGGC	upstream_gene_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0142

AC:

1037

AN:

73129

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0205

Gnomad AMI

AF:

0.0172

Gnomad AMR

AF:

0.0186

Gnomad ASJ

AF:

0.0180

Gnomad EAS

AF:

0.0180

Gnomad SAS

AF:

0.00647

Gnomad FIN

AF:

0.00521

Gnomad MID

AF:

0.00980

Gnomad NFE

AF:

0.0103

Gnomad OTH

AF:

0.0211

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

614

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

164

African (AFR)

AF:

0.00

AC:

AN:

American (AMR)

AF:

0.00

AC:

AN:

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

East Asian (EAS)

AC:

AN:

South Asian (SAS)

AF:

0.00

AC:

AN:

540

European-Finnish (FIN)

AC:

AN:

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

Other (OTH)

AF:

0.00

AC:

AN:

GnomAD4 genome

AF:

0.0142

AC:

1035

AN:

73114

Hom.:

Cov.:

AF XY:

0.00905

AC XY:

140

AN XY:

15464

show subpopulations

African (AFR)

AF:

0.0204

AC:

402

AN:

19694

American (AMR)

AF:

0.0186

AC:

124

AN:

6668

Ashkenazi Jewish (ASJ)

AF:

0.0180

AC:

AN:

1998

East Asian (EAS)

AF:

0.0181

AC:

AN:

1994

South Asian (SAS)

AF:

0.00655

AC:

AN:

1373

European-Finnish (FIN)

AF:

0.00521

AC:

AN:

1921

Middle Eastern (MID)

AF:

0.0109

AC:

AN:

European-Non Finnish (NFE)

AF:

0.0103

AC:

390

AN:

38015

Other (OTH)

AF:

0.0210

AC:

AN:

953

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

101

135

169

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

154

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

2.8

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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X-148500637-T-TGCCGCCGCCGCCGCCGCCGCC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over