NM_001160148.2:c.*3354_*3375dupACACACACACACACACACACAC

Variant names:

• chr14-53043392-A-AGTGTGTGTGTGTGTGTGTGTGT
• rs59747041
• NM_001160148.2:c.*3354_*3375dupACACACACACACACACACACAC

Variant summary

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

The NM_001160148.2(DDHD1):​c.*3354_*3375dupACACACACACACACACACACAC variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. 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: 𝑓 0.000036 (0 hom., cov: 0)
• Consequence: DDHD1 NM_001160148.2 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.05
• Publications: 1 publications found

Genes affected

DDHD1 (HGNC:19714): (DDHD domain containing 1) This gene is a member of the intracellular phospholipase A1 gene family. The protein encoded by this gene preferentially hydrolyzes phosphatidic acid. It is a cytosolic protein with some mitochondrial localization, and is thought to be involved in the regulation of mitochondrial dynamics. Overexpression of this gene causes fragmentation of the tubular structures in mitochondria, while depletion of the gene results in mitochondrial tubule elongation. Deletion of this gene in male mice caused fertility defects, resulting from disruption in the organization of the mitochondria during spermiogenesis. In humans, mutations in this gene have been associated with hereditary spastic paraplegia (HSP), also known as Strumpell-Lorrain disease, or, familial spastic paraparesis (FSP). This inherited disorder is characterized by progressive weakness and spasticity of the legs. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

DDHD1 Gene-Disease associations (from GenCC):

• hereditary spastic paraplegia

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 28

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

ACMG classification

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DDHD1	NM_001160148.2	c.*3354_*3375dupACACACACACACACACACACAC		3_prime_UTR_variant	Exon 13 of 13	ENST00000673822.2	NP_001153620.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DDHD1	ENST00000673822.2	c.*3354_*3375dupACACACACACACACACACACAC		3_prime_UTR_variant	Exon 13 of 13		NM_001160148.2	ENSP00000500986.2
DDHD1	ENST00000395606.5	c.*3354_*3375dupACACACACACACACACACACAC		3_prime_UTR_variant	Exon 13 of 13	2		ENSP00000378970.1

Frequencies

GnomAD3 genomes AF: 0.0000356 AC: 4 AN: 112418 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000110

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome AF: 0.0000356 AC: 4 AN: 112508 Hom.: 0 Cov.: 0 AF XY: 0.0000555 AC XY: 3 AN XY: 54040

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

African (AFR) AF: 0.000110 AC: 4 AN: 36326

American (AMR) AF: 0.00 AC: 0 AN: 11128

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2762

East Asian (EAS) AF: 0.00 AC: 0 AN: 3562

South Asian (SAS) AF: 0.00 AC: 0 AN: 2832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5722

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 224

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 47672

Other (OTH) AF: 0.00 AC: 0 AN: 1574

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.1

Splicing

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

Other links and lift over

dbSNP: rs59747041; hg19: chr14-53510110;