14-92932460-C-T

Position:

• chr14-92932460-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_001275.4(CHGA):​c.899C>T​(p.Ser300Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000711 in 1,406,752 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 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: 7.1e-7 (0 hom.)
• Consequence: CHGA NM_001275.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.894

Genes affected

CHGA (HGNC:1929): (chromogranin A) The protein encoded by this gene is a member of the chromogranin/secretogranin family of neuroendocrine secretory proteins. It is found in secretory vesicles of neurons and endocrine cells. This gene product is a precursor to three biologically active peptides; vasostatin, pancreastatin, and parastatin. These peptides act as autocrine or paracrine negative modulators of the neuroendocrine system. Two other peptides, catestatin and chromofungin, have antimicrobial activity and antifungal activity, respectively. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2014]

CHGA (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a modified_residue Phosphoserine (size 0) in uniprot entity CMGA_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.18126339).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHGA	NM_001275.4	c.899C>T	p.Ser300Phe	missense_variant	7/8	ENST00000216492.10	NP_001266.1
CHGA	NM_001301690.2	c.446C>T	p.Ser149Phe	missense_variant	6/7		NP_001288619.1
CHGA	XM_011536370.3	c.899C>T	p.Ser300Phe	missense_variant	8/9		XP_011534672.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHGA	ENST00000216492.10	c.899C>T	p.Ser300Phe	missense_variant	7/8	1	NM_001275.4	ENSP00000216492.5
CHGA	ENST00000334654.4	c.446C>T	p.Ser149Phe	missense_variant	6/7	1		ENSP00000334023.4
CHGA	ENST00000556876.1	n.117C>T		non_coding_transcript_exon_variant	2/2	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.11e-7 AC: 1 AN: 1406752 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 694512

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.0000171

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

Dec 08, 2023

The c.899C>T (p.S300F) alteration is located in exon 7 (coding exon 7) of the CHGA gene. This alteration results from a C to T substitution at nucleotide position 899, causing the serine (S) at amino acid position 300 to be replaced by a phenylalanine (F). 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	0.10
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.23	T;T
Eigen	Benign	-0.21
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.16	N
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M;.
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-2.3	N;D
REVEL	Benign	0.063
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.011	D;D
Polyphen		1.0	D;D
Vest4		0.31
MutPred		0.45		Loss of phosphorylation at S300 (P = 0.0083);.;
MVP		0.24
MPC		0.71
ClinPred		0.49	T
GERP RS		0.63
Varity_R		0.16
gMVP		0.048

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: rs753407523; hg19: chr14-93398805;