19-18868673-A-G

Variant names:

• chr19-18868673-A-G
• NM_001492.6:c.1043T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_001492.6(GDF1):​c.1043T>C​(p.Leu348Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000703 in 1,421,612 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: 7.0e-7 (0 hom.)
• Consequence: GDF1 NM_001492.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.84

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 Likely_pathogenic. Variant got 8 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, 0.99

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GDF1	NM_001492.6	c.1043T>C	p.Leu348Pro	missense_variant	Exon 8 of 8	ENST00000247005.8	NP_001483.3
CERS1	NM_021267.5	c.*1312T>C		3_prime_UTR_variant	Exon 8 of 8	ENST00000623882.4	NP_067090.1
GDF1	NM_001387438.1	c.1043T>C	p.Leu348Pro	missense_variant	Exon 5 of 5		NP_001374367.1
CERS1	NM_001387440.1	c.*1904T>C		3_prime_UTR_variant	Exon 7 of 7		NP_001374369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GDF1	ENST00000247005.8	c.1043T>C	p.Leu348Pro	missense_variant	Exon 8 of 8	1	NM_001492.6	ENSP00000247005.5
CERS1	ENST00000623882	c.*1312T>C		3_prime_UTR_variant	Exon 8 of 8	1	NM_021267.5	ENSP00000485308.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.03e-7 AC: 1 AN: 1421612 Hom.: 0 Cov.: 31 AF XY: 0.00000142 AC XY: 1 AN XY: 703444

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: 0.0000123

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 28, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. This variant has not been reported in the literature in individuals affected with GDF1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 348 of the GDF1 protein (p.Leu348Pro). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.91	D;.
M_CAP	Pathogenic	0.82	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Pathogenic	3.8	H;.
PROVEAN	Pathogenic	-6.5	D;.
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Vest4		0.97
MutPred		0.93		Loss of stability (P = 0.0048);Loss of stability (P = 0.0048);
MVP		0.89
MPC		2.6
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.97
gMVP		0.99

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-18979482;