chr19-18893427-G-A

Variant names:

• chr19-18893427-G-A
• rs1555707050
• NM_001492.6:c.-925C>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001492.6(GDF1):​c.-925C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GDF1 NM_001492.6 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.51
• Publications: 0 publications found

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]

CERS1 Gene-Disease associations (from GenCC):

• progressive myoclonic epilepsy type 8

  Inheritance: AR Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.885

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001492.6. 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
	GDF1	NM_001492.6	MANE Select	c.-925C>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 8	NP_001483.3
	CERS1	NM_021267.5	MANE Select	c.398C>T	p.Ser133Phe	missense	Exon 2 of 8	NP_067090.1
	GDF1	NM_001492.6	MANE Select	c.-925C>T		5_prime_UTR	Exon 2 of 8	NP_001483.3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GDF1	ENST00000247005.8	TSL:1 MANE Select	c.-925C>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 8	ENSP00000247005.5
	CERS1	ENST00000623882.4	TSL:1 MANE Select	c.398C>T	p.Ser133Phe	missense	Exon 2 of 8	ENSP00000485308.1
	CERS1	ENST00000429504.6	TSL:1	c.398C>T	p.Ser133Phe	missense	Exon 2 of 6	ENSP00000389044.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Progressive myoclonic epilepsy type 8 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.55	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Uncertain	0.61	D
MutationAssessor	Pathogenic	2.9	M
PhyloP100		9.5
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-4.8	D
REVEL	Pathogenic	0.76
Sift	Uncertain	0.010	D
Sift4G	Uncertain	0.013	D
Polyphen		1.0	D
Vest4		0.83
MutPred		0.44		Loss of glycosylation at S133 (P = 0.0192)
MVP		0.74
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.42
Mutation Taster		=233/67	polymorphism

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

Other links and lift over

dbSNP: rs1555707050; hg19: chr19-19004236;