rs533705093

Variant names:

• chr19-7555245-C-A
• rs533705093
• NM_001166114.2:c.2818-4C>A

Your query was ambiguous. Multiple possible variants found:

• chr19-7555245-C-A
• chr19-7555245-C-T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001166114.2(PNPLA6):​c.2818-4C>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,441,764 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: PNPLA6 NM_001166114.2 splice_region, intron
• Scores: Splicing: ADA: 0.0002475
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.665
• Publications: 0 publications found

Genes affected

PNPLA6 (HGNC:16268): (patatin like phospholipase domain containing 6) This gene encodes a phospholipase that deacetylates intracellular phosphatidylcholine to produce glycerophosphocholine. It is thought to function in neurite outgrowth and process elongation during neuronal differentiation. The protein is anchored to the cytoplasmic face of the endoplasmic reticulum in both neurons and non-neuronal cells. Mutations in this gene result in autosomal recessive spastic paraplegia, and the protein is the target for neurodegeneration induced by organophosphorus compounds and chemical warfare agents. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

PNPLA6 Gene-Disease associations (from GenCC):

• ataxia-hypogonadism-choroidal dystrophy syndrome

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• PNPLA6-related spastic paraplegia with or without ataxia

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 39

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• cerebellar ataxia-hypogonadism syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Laurence-Moon syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• trichomegaly-retina pigmentary degeneration-dwarfism syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.47).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PNPLA6	NM_001166114.2	c.2818-4C>A		splice_region_variant, intron_variant	Intron 22 of 31	ENST00000600737.6	NP_001159586.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PNPLA6	ENST00000600737.6	c.2818-4C>A		splice_region_variant, intron_variant	Intron 22 of 31	1	NM_001166114.2	ENSP00000473211.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1441764 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 715808

⚠️ 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: 33230

American (AMR) AF: 0.00 AC: 0 AN: 42034

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25660

East Asian (EAS) AF: 0.00 AC: 0 AN: 39094

South Asian (SAS) AF: 0.00 AC: 0 AN: 83394

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51528

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5742

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1101446

Other (OTH) AF: 0.0000168 AC: 1 AN: 59636

⚠️ 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

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
CADD	Benign	9.5
DANN	Benign	0.89
PhyloP100		0.67
PromoterAI		-0.0054	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00025
dbscSNV1_RF	Benign	0.11
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: rs533705093; hg19: chr19-7620131;