8-38233099-C-G

Variant names:

• chr8-38233099-C-G
• rs1358332959
• NM_015214.3:c.105C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_015214.3(DDHD2):​c.105C>G​(p.Ser35Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,824 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S35G) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DDHD2 NM_015214.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.229
• Publications: 0 publications found

Genes affected

DDHD2 (HGNC:29106): (DDHD domain containing 2) This gene encodes a phospholipase enzyme containing sterile-alpha-motif (SAM), WWE, and DDHD domains. This protein participates in membrane trafficking between the endoplastic reticulum and the Golgi body. Mutations in this gene can cause autosomal recessive spastic paraplegia 54. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

DDHD2 Gene-Disease associations (from GenCC):

• hereditary spastic paraplegia 54

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07437989).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015214.3. 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
	DDHD2	NM_015214.3	MANE Select	c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	NP_056029.2	O94830-1
	DDHD2	NM_001164232.2		c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	NP_001157704.1	O94830-1
	DDHD2	NM_001362911.2		c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	NP_001349840.1	O94830-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DDHD2	ENST00000397166.7	TSL:2 MANE Select	c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	ENSP00000380352.2	O94830-1
	DDHD2	ENST00000853787.1		c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	ENSP00000523846.1
	DDHD2	ENST00000520272.6	TSL:2	c.105C>G	p.Ser35Arg	missense	Exon 2 of 18	ENSP00000429932.2	O94830-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251462 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461824 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727220

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

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.0000224 AC: 1 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111950

Other (OTH) AF: 0.00 AC: 0 AN: 60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Hereditary spastic paraplegia 54 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Benign	0.023	T
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.40
FATHMM_MKL	Benign	0.69	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.0052	T
MetaRNN	Benign	0.074	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.34	N
PhyloP100		0.23
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.4	N
REVEL	Benign	0.043
Sift	Benign	0.40	T
Sift4G	Benign	0.082	T
Polyphen		0.13	B
Vest4		0.32
MutPred		0.27		Loss of phosphorylation at S35 (P = 0.0501)
MVP		0.18
MPC		0.18
ClinPred		0.075	T
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.076
gMVP		0.31
Mutation Taster		=85/15	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs1358332959; hg19: chr8-38090617;