2-100004803-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001386135.1(AFF3):c.873+1829G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.267 in 151,630 control chromosomes in the GnomAD database, including 8,256 homozygotes. 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 0.27 (8256 hom., cov: 31)
• Consequence: AFF3 NM_001386135.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.473

Genes affected

AFF3 (HGNC:6473): (ALF transcription elongation factor 3) This gene encodes a tissue-restricted nuclear transcriptional activator that is preferentially expressed in lymphoid tissue. Isolation of this protein initially defined a highly conserved LAF4/MLLT2 gene family of nuclear transcription factors that may function in lymphoid development and oncogenesis. In some ALL patients, this gene has been found fused to the gene for MLL. Multiple alternatively spliced transcript variants that encode different proteins have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.562 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AFF3	NM_001386135.1	c.873+1829G>A		intron_variant		ENST00000672756.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AFF3	ENST00000672756.2	c.873+1829G>A		intron_variant			NM_001386135.1	A2

Frequencies

GnomAD3 genomes AF: 0.266 AC: 40369 AN: 151514 Hom.: 8218 Cov.: 31

Gnomad AFR AF: 0.567

Gnomad AMI AF: 0.00659

Gnomad AMR AF: 0.134

Gnomad ASJ AF: 0.0988

Gnomad EAS AF: 0.00154

Gnomad SAS AF: 0.0946

Gnomad FIN AF: 0.232

Gnomad MID AF: 0.127

Gnomad NFE AF: 0.167

Gnomad OTH AF: 0.203

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

GnomAD4 genome AF: 0.267 AC: 40458 AN: 151630 Hom.: 8256 Cov.: 31 AF XY: 0.263 AC XY: 19474 AN XY: 74068

Gnomad4 AFR AF: 0.568

Gnomad4 AMR AF: 0.133

Gnomad4 ASJ AF: 0.0988

Gnomad4 EAS AF: 0.00155

Gnomad4 SAS AF: 0.0943

Gnomad4 FIN AF: 0.232

Gnomad4 NFE AF: 0.167

Gnomad4 OTH AF: 0.201

Alfa AF: 0.167 Hom.: 3337

Bravo AF: 0.270

Asia WGS AF: 0.0700 AC: 246 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
Cadd	Benign	0.57
Dann	Benign	0.42

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: rs6736239; hg19: chr2-100621265;