chr3-100748271-C-A

Variant names:

• chr3-100748271-C-A
• rs1553704852
• NM_006070.6:c.943C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006070.6(TFG):​c.943C>A​(p.Pro315Thr) 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. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P315L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TFG NM_006070.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.29
• Publications: 0 publications found

Genes affected

TFG (HGNC:11758): (trafficking from ER to golgi regulator) There are several documented fusion oncoproteins encoded partially by this gene. This gene also participates in several oncogenic rearrangements resulting in anaplastic lymphoma and mixoid chondrosarcoma, and may play a role in the NF-kappaB pathway. Multiple transcript variants have been found for this gene. [provided by RefSeq, Sep 2010]

TFG Gene-Disease associations (from GenCC):

• hereditary motor and sensory neuropathy, Okinawa type

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• hereditary spastic paraplegia 57

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• autosomal dominant Charcot-Marie-Tooth disease type 2 due to TFG mutation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13570362).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TFG	NM_006070.6	c.943C>A	p.Pro315Thr	missense_variant	Exon 8 of 8	ENST00000240851.9	NP_006061.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TFG	ENST00000240851.9	c.943C>A	p.Pro315Thr	missense_variant	Exon 8 of 8	1	NM_006070.6	ENSP00000240851.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Oct 06, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.943C>A (p.P315T) alteration is located in exon 8 (coding exon 7) of the TFG gene. This alteration results from a C to A substitution at nucleotide position 943, causing the proline (P) at amino acid position 315 to be replaced by a threonine (T). 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	0.059
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.23	.;T;T;.
Eigen	Benign	-0.22
Eigen_PC	Benign	-0.17
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.72	.;.;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.14	T;T;T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	1.8	.;L;L;.
PhyloP100		3.3
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-1.6	N;N;N;N
REVEL	Benign	0.049
Sift	Benign	0.036	D;D;D;D
Sift4G	Benign	0.11	T;D;D;T
Polyphen		0.0	.;B;B;.
Vest4		0.13
MutPred		0.29		.;Loss of glycosylation at P315 (P = 0.0083);Loss of glycosylation at P315 (P = 0.0083);.;
MVP		0.33
MPC		0.91
ClinPred		0.35	T
GERP RS		3.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.068
gMVP		0.15
Mutation Taster		=93/7	polymorphism

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: rs1553704852; hg19: chr3-100467115;