18-26227102-A-G

Position:

• chr18-26227102-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_005640.3(TAF4B):​c.169A>G​(p.Thr57Ala) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TAF4B NM_005640.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.89

Genes affected

TAF4B (HGNC:11538): (TATA-box binding protein associated factor 4b) TATA binding protein (TBP) and TBP-associated factors (TAFs) participate in the formation of the TFIID protein complex, which is involved in initiation of transcription of genes by RNA polymerase II. This gene encodes a cell type-specific TAF that may be responsible for mediating transcription by a subset of activators in B cells. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.046656758).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TAF4B	NM_005640.3	c.169A>G	p.Thr57Ala	missense_variant	1/15	ENST00000269142.10	NP_005631.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TAF4B	ENST00000269142.10	c.169A>G	p.Thr57Ala	missense_variant	1/15	1	NM_005640.3	ENSP00000269142	P4
TAF4B	ENST00000578121.5	c.169A>G	p.Thr57Ala	missense_variant	1/15	2		ENSP00000462980	A2
TAF4B	ENST00000418698.3	c.169A>G	p.Thr57Ala	missense_variant, NMD_transcript_variant	1/16	5		ENSP00000389365

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

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

Ambry Genetics

May 21, 2024

The c.169A>G (p.T57A) alteration is located in exon 1 (coding exon 1) of the TAF4B gene. This alteration results from a A to G substitution at nucleotide position 169, causing the threonine (T) at amino acid position 57 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.055
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.74
CADD	Benign	0.35
DANN	Benign	0.67
DEOGEN2	Benign	0.039	T;T
Eigen	Benign	-1.6
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.017	N
LIST_S2	Benign	0.45	T;T
M_CAP	Benign	0.0035	T
MetaRNN	Benign	0.047	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.0	L;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-0.76	N;.
REVEL	Benign	0.034
Sift	Benign	0.33	T;.
Sift4G	Benign	0.41	T;T
Polyphen		0.0	B;.
Vest4		0.038
MutPred		0.16		Gain of sheet (P = 0.0011);Gain of sheet (P = 0.0011);
MVP		0.30
MPC		0.75
ClinPred		0.22	T
GERP RS		-11
Varity_R		0.062
gMVP		0.14

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr18-23807066;