6-139242959-G-A

Position:

• chr6-139242959-G-A

Variant summary

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

The NM_153235.4(TXLNB):​c.1622C>T​(p.Pro541Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,872 control chromosomes in the GnomAD database, with no homozygous occurrence. 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)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TXLNB NM_153235.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.309

Genes affected

TXLNB (HGNC:21617): (taxilin beta) Predicted to enable syntaxin binding activity. Located in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ENSG00000272446 (HGNC:):

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=0.043584913).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TXLNB	NM_153235.4	c.1622C>T	p.Pro541Leu	missense_variant	10/10	ENST00000358430.8	NP_694967.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TXLNB	ENST00000358430.8	c.1622C>T	p.Pro541Leu	missense_variant	10/10	1	NM_153235.4	ENSP00000351206.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250890 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135756

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461872 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 727236

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

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 18, 2022

The c.1622C>T (p.P541L) alteration is located in exon 10 (coding exon 9) of the TXLNB gene. This alteration results from a C to T substitution at nucleotide position 1622, causing the proline (P) at amino acid position 541 to be replaced by a leucine (L). 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	0.072
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.72
CADD	Benign	4.0
DANN	Benign	0.77
DEOGEN2	Benign	0.0012	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.086	N
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.0060	T
MetaRNN	Benign	0.044	T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.5	L
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.72	N
REVEL	Benign	0.034
Sift	Benign	0.38	T
Sift4G	Benign	0.54	T
Polyphen		0.0	B
Vest4		0.093
MutPred		0.15		Loss of glycosylation at P541 (P = 0.0372);
MVP		0.15
MPC		0.079
ClinPred		0.041	T
GERP RS		-4.3
Varity_R		0.034
gMVP		0.087

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: rs1271897981; hg19: chr6-139564096;