14-65032676-C-A

Variant names:

• chr14-65032676-C-A
• NM_002028.4:c.672C>A
• FNTB p.Gly224Gly

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_002028.4(FNTB):​c.672C>A​(p.Gly224Gly) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G224G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FNTB NM_002028.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.165
• Publications: 0 publications found

Genes affected

FNTB (HGNC:3785): (farnesyltransferase, CAAX box, beta) Enables zinc ion binding activity. Contributes to protein farnesyltransferase activity. Involved in protein farnesylation. Part of microtubule associated complex and protein farnesyltransferase complex. [provided by Alliance of Genome Resources, Apr 2022]

CHURC1-FNTB (HGNC:42960): (CHURC1-FNTB readthrough) This locus represents naturally occurring read-through transcription between the neighboring CHURC1 (churchill domain containing 1) and FNTB (farnesyltransferase, CAAX box, beta) on chromosome 14. The read-through transcript produces a fusion protein that shares sequence identity with each individual gene product. [provided by RefSeq, Feb 2011]

MAX (HGNC:6913): (MYC associated factor X) The protein encoded by this gene is a member of the basic helix-loop-helix leucine zipper (bHLHZ) family of transcription factors. It is able to form homodimers and heterodimers with other family members, which include Mad, Mxi1 and Myc. Myc is an oncoprotein implicated in cell proliferation, differentiation and apoptosis. The homodimers and heterodimers compete for a common DNA target site (the E box) and rearrangement among these dimer forms provides a complex system of transcriptional regulation. Mutations of this gene have been reported to be associated with hereditary pheochromocytoma. A pseudogene of this gene is located on the long arm of chromosome 7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

MAX Gene-Disease associations (from GenCC):

• hereditary pheochromocytoma-paraganglioma

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• pheochromocytoma

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• polydactyly-macrocephaly syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.28).
• BP7: Synonymous conserved (PhyloP=0.165 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002028.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FNTB	NM_002028.4	MANE Select	c.672C>A	p.Gly224Gly	synonymous	Exon 7 of 12	NP_002019.1	A0A384MEJ5
	CHURC1-FNTB	NM_001202559.1		c.855C>A	p.Gly285Gly	synonymous	Exon 9 of 14	NP_001189488.1	B4DL54
	CHURC1-FNTB	NM_001202558.2		c.534C>A	p.Gly178Gly	synonymous	Exon 8 of 13	NP_001189487.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FNTB	ENST00000246166.3	TSL:1 MANE Select	c.672C>A	p.Gly224Gly	synonymous	Exon 7 of 12	ENSP00000246166.2	P49356-1
	CHURC1-FNTB	ENST00000549987.1	TSL:2	c.774C>A	p.Gly258Gly	synonymous	Exon 9 of 14	ENSP00000447121.2	B4DL54
	FNTB	ENST00000916264.1		c.804C>A	p.Gly268Gly	synonymous	Exon 8 of 13	ENSP00000586323.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.28
CADD	Benign	12
DANN	Benign	0.71
PhyloP100		0.17

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr14-65499394;