Genetic Variant GDF1:p.Ala154_Ala157dup (chr19-18869245-T-TGCCGCCGCCGCC) – ACMG Classification: Likely_benign (-1 pts)

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_001492.6(GDF1):c.459_470dupGGCGGCGGCGGC(p.Ala154_Ala157dup) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000157 in 1,277,688 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000016 ( 0 hom. )

Consequence

GDF1
NM_001492.6 disruptive_inframe_insertion

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.179

Publications

0 publications found

Variant links:

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]

GDF1 links:

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)

CERS1 links:

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ACMG classification

Classification was made for transcript

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

BP3

Nonframeshift variant in repetitive region in NM_001492.6

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
GDF1	NM_001492.6 link	c.459_470dupGGCGGCGGCGGC	p.Ala154_Ala157dup	disruptive_inframe_insertion	Exon 8 of 8	ENST00000247005.8	NP_001483.3
CERS1	NM_021267.5 link	c.728_739dupGGCGGCGGCGGC		3_prime_UTR_variant	Exon 8 of 8	ENST00000623882.4	NP_067090.1
GDF1	NM_001387438.1 link	c.459_470dupGGCGGCGGCGGC	p.Ala154_Ala157dup	disruptive_inframe_insertion	Exon 5 of 5		NP_001374367.1
CERS1	NM_001387440.1 link	c.1320_1331dupGGCGGCGGCGGC		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 link	c.459_470dupGGCGGCGGCGGC	p.Ala154_Ala157dup	disruptive_inframe_insertion	Exon 8 of 8	1	NM_001492.6	ENSP00000247005.5
CERS1	ENST00000623882.4 link	c.728_739dupGGCGGCGGCGGC		3_prime_UTR_variant	Exon 8 of 8	1	NM_021267.5	ENSP00000485308.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000157

AC:

AN:

1277688

Hom.:

Cov.:

AF XY:

0.00000159

AC XY:

AN XY:

627912

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

24920

American (AMR)

AF:

0.00

AC:

AN:

19274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19612

East Asian (EAS)

AF:

0.00

AC:

AN:

28020

South Asian (SAS)

AF:

0.00

AC:

AN:

64146

European-Finnish (FIN)

AF:

0.00

AC:

AN:

30818

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3654

European-Non Finnish (NFE)

AF:

0.00000193

AC:

AN:

1034548

Other (OTH)

AF:

0.00

AC:

AN:

52696

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00233887), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.350

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.18

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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19-18869245-TGCCGCCGCC-TGCCGCCGCCGCCGCCGCCGCC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over