chr19-18868641-G-A

Position:

• chr19-18868641-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_001492.6(GDF1):​c.1075C>T​(p.Arg359Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000141 in 1,422,232 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: GDF1 NM_001492.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.844

Genes affected

GDF1 (HGNC:4214): (growth differentiation factor 1) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate each subunit of the disulfide-linked homodimer. Studies in rodents suggest that this protein is involved in the establishment of left-right asymmetry in early embryogenesis and in neural development in later embryogenesis. The encoded protein is translated from a bicistronic mRNA that also encodes ceramide synthase 1. Mutations in this gene are associated with several congenital cardiovascular malformations. [provided by RefSeq, Jul 2016]

CERS1 (HGNC:14253): (ceramide synthase 1) This gene encodes a ceramide synthase enzyme, which catalyzes the synthesis of ceramide, the hydrophobic moiety of sphingolipids. The encoded enzyme synthesizes 18-carbon (C18) ceramide in brain neurons. Elevated expression of this gene may be associated with increased longevity, while decreased expression of this gene may be associated with myoclonus epilepsy with dementia in human patients. This protein is transcribed from a monocistronic mRNA as well as a bicistronic mRNA, which also encodes growth differentiation factor 1. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a chain Embryonic growth/differentiation factor 1 (size 118) in uniprot entity GDF1_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_001492.6
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.753

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GDF1	NM_001492.6	c.1075C>T	p.Arg359Trp	missense_variant	8/8	ENST00000247005.8	NP_001483.3
CERS1	NM_021267.5	c.*1344C>T		3_prime_UTR_variant	8/8	ENST00000623882.4	NP_067090.1
GDF1	NM_001387438.1	c.1075C>T	p.Arg359Trp	missense_variant	5/5		NP_001374367.1
CERS1	NM_001387440.1	c.*1936C>T		3_prime_UTR_variant	7/7		NP_001374369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GDF1	ENST00000247005.8	c.1075C>T	p.Arg359Trp	missense_variant	8/8	1	NM_001492.6	ENSP00000247005.5
CERS1	ENST00000623882	c.*1344C>T		3_prime_UTR_variant	8/8	1	NM_021267.5	ENSP00000485308.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000141 AC: 2 AN: 1422232 Hom.: 0 Cov.: 31 AF XY: 0.00000284 AC XY: 2 AN XY: 703652

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000530

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.: 33

Alfa AF: 0.000111 Hom.: 0

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 13, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GDF1 protein function. ClinVar contains an entry for this variant (Variation ID: 660810). This variant has not been reported in the literature in individuals affected with GDF1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 359 of the GDF1 protein (p.Arg359Trp). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D;.
Eigen	Benign	0.16
Eigen_PC	Benign	0.047
FATHMM_MKL	Benign	0.32	N
LIST_S2	Uncertain	0.97	D;.
M_CAP	Pathogenic	0.80	D
MetaRNN	Pathogenic	0.75	D;D
MetaSVM	Uncertain	0.61	D
MutationAssessor	Pathogenic	3.1	M;.
MutationTaster	Benign	1.0	D;D
PROVEAN	Pathogenic	-6.9	D;.
REVEL	Pathogenic	0.70
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0010	D;D
Vest4		0.42
MutPred		0.79		Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);
MVP		0.32
MPC		2.1
ClinPred		0.97	D
GERP RS		2.6
Varity_R		0.81
gMVP		0.90

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: rs1324719289; hg19: chr19-18979450;