20-3660939-C-G

Position:

• chr20-3660939-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_145762.3(GFRA4):​c.397G>C​(p.Ala133Pro) 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. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: GFRA4 NM_145762.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.522

Genes affected

GFRA4 (HGNC:13821): (GDNF family receptor alpha 4) The protein encoded by this gene is a member of the GDNF receptor family. It is a glycosylphosphatidylinositol(GPI)-linked cell surface receptor for persephin, and mediates activation of the RET tyrosine kinase receptor. This gene is a candidate gene for RET-associated diseases. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1420914).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GFRA4	NM_022139.4	c.392+5G>C		splice_region_variant, intron_variant		ENST00000290417.7	NP_071422.1
GFRA4	NM_145762.3	c.397G>C	p.Ala133Pro	missense_variant	2/5		NP_665705.1
GFRA4	XM_005260793.2	c.392+5G>C		splice_region_variant, intron_variant			XP_005260850.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GFRA4	ENST00000319242.8	c.397G>C	p.Ala133Pro	missense_variant	2/5	1		ENSP00000313423.3
GFRA4	ENST00000290417.7	c.392+5G>C		splice_region_variant, intron_variant		1	NM_022139.4	ENSP00000290417.2
GFRA4	ENST00000477160.1	n.392+5G>C		splice_region_variant, intron_variant		1		ENSP00000435801.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 39

GnomAD4 genome Cov.: 33

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

Feb 26, 2024

The c.397G>C (p.A133P) alteration is located in exon 2 (coding exon 2) of the GFRA4 gene. This alteration results from a G to C substitution at nucleotide position 397, causing the alanine (A) at amino acid position 133 to be replaced by a proline (P). 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	0.080
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	10
DANN	Benign	0.96
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.68
FATHMM_MKL	Benign	0.042	N
LIST_S2	Benign	0.25	T
M_CAP	Benign	0.032	D
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.0	N
PROVEAN	Benign	-0.11	N
REVEL	Benign	0.24
Sift	Benign	0.17	T
Sift4G	Benign	0.25	T
Polyphen		0.97	D
Vest4		0.19
MutPred		0.62		Gain of loop (P = 0.0079);
MVP		0.55
MPC		0.46
ClinPred		0.37	T
GERP RS		0.27
Varity_R		0.22
gMVP		0.78

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr20-3641586;